avconv.c 81.4 KB
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/*
 * avconv main
 * Copyright (c) 2000-2011 The libav developers.
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "config.h"
#include <ctype.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <limits.h>
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#include <stdint.h>

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#include "libavformat/avformat.h"
#include "libavdevice/avdevice.h"
#include "libswscale/swscale.h"
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#include "libavresample/avresample.h"
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#include "libavutil/opt.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/parseutils.h"
#include "libavutil/samplefmt.h"
#include "libavutil/fifo.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"
#include "libavutil/avstring.h"
#include "libavutil/libm.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/time.h"
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#include "libavformat/os_support.h"

# include "libavfilter/avfilter.h"
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# include "libavfilter/buffersrc.h"
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# include "libavfilter/buffersink.h"
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#if HAVE_SYS_RESOURCE_H
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#include <sys/time.h>
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#include <sys/types.h>
#include <sys/resource.h>
#elif HAVE_GETPROCESSTIMES
#include <windows.h>
#endif
#if HAVE_GETPROCESSMEMORYINFO
#include <windows.h>
#include <psapi.h>
#endif

#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif

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#if HAVE_PTHREADS
#include <pthread.h>
#endif

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#include <time.h>

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#include "avconv.h"
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#include "cmdutils.h"

#include "libavutil/avassert.h"

const char program_name[] = "avconv";
const int program_birth_year = 2000;

static FILE *vstats_file;

static int64_t video_size = 0;
static int64_t audio_size = 0;
static int64_t extra_size = 0;
static int nb_frames_dup = 0;
static int nb_frames_drop = 0;


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#if HAVE_PTHREADS
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/* signal to input threads that they should exit; set by the main thread */
static int transcoding_finished;
#endif

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#define DEFAULT_PASS_LOGFILENAME_PREFIX "av2pass"

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InputStream **input_streams = NULL;
int        nb_input_streams = 0;
InputFile   **input_files   = NULL;
int        nb_input_files   = 0;
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OutputStream **output_streams = NULL;
int         nb_output_streams = 0;
OutputFile   **output_files   = NULL;
int         nb_output_files   = 0;
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FilterGraph **filtergraphs;
int        nb_filtergraphs;
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static void term_exit(void)
{
    av_log(NULL, AV_LOG_QUIET, "");
}

static volatile int received_sigterm = 0;
static volatile int received_nb_signals = 0;

static void
sigterm_handler(int sig)
{
    received_sigterm = sig;
    received_nb_signals++;
    term_exit();
}

static void term_init(void)
{
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    signal(SIGINT , sigterm_handler); /* Interrupt (ANSI).    */
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    signal(SIGTERM, sigterm_handler); /* Termination (ANSI).  */
#ifdef SIGXCPU
    signal(SIGXCPU, sigterm_handler);
#endif
}

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static int decode_interrupt_cb(void *ctx)
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{
    return received_nb_signals > 1;
}

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const AVIOInterruptCB int_cb = { decode_interrupt_cb, NULL };
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static void avconv_cleanup(int ret)
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{
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    int i, j;

    for (i = 0; i < nb_filtergraphs; i++) {
        avfilter_graph_free(&filtergraphs[i]->graph);
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        for (j = 0; j < filtergraphs[i]->nb_inputs; j++) {
            av_freep(&filtergraphs[i]->inputs[j]->name);
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            av_freep(&filtergraphs[i]->inputs[j]);
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        }
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        av_freep(&filtergraphs[i]->inputs);
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        for (j = 0; j < filtergraphs[i]->nb_outputs; j++) {
            av_freep(&filtergraphs[i]->outputs[j]->name);
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            av_freep(&filtergraphs[i]->outputs[j]);
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        }
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        av_freep(&filtergraphs[i]->outputs);
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        av_freep(&filtergraphs[i]->graph_desc);
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        av_freep(&filtergraphs[i]);
    }
    av_freep(&filtergraphs);
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    /* close files */
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    for (i = 0; i < nb_output_files; i++) {
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        AVFormatContext *s = output_files[i]->ctx;
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        if (s && s->oformat && !(s->oformat->flags & AVFMT_NOFILE) && s->pb)
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            avio_close(s->pb);
        avformat_free_context(s);
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        av_dict_free(&output_files[i]->opts);
        av_freep(&output_files[i]);
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    }
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    for (i = 0; i < nb_output_streams; i++) {
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        AVBitStreamFilterContext *bsfc = output_streams[i]->bitstream_filters;
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        while (bsfc) {
            AVBitStreamFilterContext *next = bsfc->next;
            av_bitstream_filter_close(bsfc);
            bsfc = next;
        }
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        output_streams[i]->bitstream_filters = NULL;
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        av_frame_free(&output_streams[i]->filtered_frame);
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        av_parser_close(output_streams[i]->parser);

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        av_freep(&output_streams[i]->forced_keyframes);
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        av_freep(&output_streams[i]->avfilter);
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        av_freep(&output_streams[i]->logfile_prefix);
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        av_freep(&output_streams[i]);
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    }
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    for (i = 0; i < nb_input_files; i++) {
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        avformat_close_input(&input_files[i]->ctx);
        av_freep(&input_files[i]);
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    }
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    for (i = 0; i < nb_input_streams; i++) {
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        av_frame_free(&input_streams[i]->decoded_frame);
        av_frame_free(&input_streams[i]->filter_frame);
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        av_dict_free(&input_streams[i]->opts);
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        av_freep(&input_streams[i]->filters);
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        av_freep(&input_streams[i]->hwaccel_device);
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        av_freep(&input_streams[i]);
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    }
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    if (vstats_file)
        fclose(vstats_file);
    av_free(vstats_filename);

    av_freep(&input_streams);
    av_freep(&input_files);
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    av_freep(&output_streams);
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    av_freep(&output_files);
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    uninit_opts();

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    avformat_network_deinit();
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    if (received_sigterm) {
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        av_log(NULL, AV_LOG_INFO, "Received signal %d: terminating.\n",
               (int) received_sigterm);
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        exit (255);
    }
}

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void assert_avoptions(AVDictionary *m)
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{
    AVDictionaryEntry *t;
    if ((t = av_dict_get(m, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
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        av_log(NULL, AV_LOG_FATAL, "Option %s not found.\n", t->key);
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        exit_program(1);
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    }
}

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static void abort_codec_experimental(AVCodec *c, int encoder)
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{
    const char *codec_string = encoder ? "encoder" : "decoder";
    AVCodec *codec;
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    av_log(NULL, AV_LOG_FATAL, "%s '%s' is experimental and might produce bad "
            "results.\nAdd '-strict experimental' if you want to use it.\n",
            codec_string, c->name);
    codec = encoder ? avcodec_find_encoder(c->id) : avcodec_find_decoder(c->id);
    if (!(codec->capabilities & CODEC_CAP_EXPERIMENTAL))
        av_log(NULL, AV_LOG_FATAL, "Or use the non experimental %s '%s'.\n",
               codec_string, codec->name);
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    exit_program(1);
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}

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/*
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 * Update the requested input sample format based on the output sample format.
 * This is currently only used to request float output from decoders which
 * support multiple sample formats, one of which is AV_SAMPLE_FMT_FLT.
 * Ideally this will be removed in the future when decoders do not do format
 * conversion and only output in their native format.
 */
static void update_sample_fmt(AVCodecContext *dec, AVCodec *dec_codec,
                              AVCodecContext *enc)
{
    /* if sample formats match or a decoder sample format has already been
       requested, just return */
    if (enc->sample_fmt == dec->sample_fmt ||
        dec->request_sample_fmt > AV_SAMPLE_FMT_NONE)
        return;

    /* if decoder supports more than one output format */
    if (dec_codec && dec_codec->sample_fmts &&
        dec_codec->sample_fmts[0] != AV_SAMPLE_FMT_NONE &&
        dec_codec->sample_fmts[1] != AV_SAMPLE_FMT_NONE) {
        const enum AVSampleFormat *p;
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        int min_dec = INT_MAX, min_inc = INT_MAX;
        enum AVSampleFormat dec_fmt = AV_SAMPLE_FMT_NONE;
        enum AVSampleFormat inc_fmt = AV_SAMPLE_FMT_NONE;
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        /* find a matching sample format in the encoder */
        for (p = dec_codec->sample_fmts; *p != AV_SAMPLE_FMT_NONE; p++) {
            if (*p == enc->sample_fmt) {
                dec->request_sample_fmt = *p;
                return;
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            } else {
                enum AVSampleFormat dfmt = av_get_packed_sample_fmt(*p);
                enum AVSampleFormat efmt = av_get_packed_sample_fmt(enc->sample_fmt);
                int fmt_diff = 32 * abs(dfmt - efmt);
                if (av_sample_fmt_is_planar(*p) !=
                    av_sample_fmt_is_planar(enc->sample_fmt))
                    fmt_diff++;
                if (dfmt == efmt) {
                    min_inc = fmt_diff;
                    inc_fmt = *p;
                } else if (dfmt > efmt) {
                    if (fmt_diff < min_inc) {
                        min_inc = fmt_diff;
                        inc_fmt = *p;
                    }
                } else {
                    if (fmt_diff < min_dec) {
                        min_dec = fmt_diff;
                        dec_fmt = *p;
                    }
                }
            }
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        }

        /* if none match, provide the one that matches quality closest */
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        dec->request_sample_fmt = min_inc != INT_MAX ? inc_fmt : dec_fmt;
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    }
}

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static void write_frame(AVFormatContext *s, AVPacket *pkt, OutputStream *ost)
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{
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    AVBitStreamFilterContext *bsfc = ost->bitstream_filters;
    AVCodecContext          *avctx = ost->st->codec;
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    int ret;

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    /*
     * Audio encoders may split the packets --  #frames in != #packets out.
     * But there is no reordering, so we can limit the number of output packets
     * by simply dropping them here.
     * Counting encoded video frames needs to be done separately because of
     * reordering, see do_video_out()
     */
    if (!(avctx->codec_type == AVMEDIA_TYPE_VIDEO && avctx->codec)) {
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        if (ost->frame_number >= ost->max_frames) {
            av_free_packet(pkt);
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            return;
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        }
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        ost->frame_number++;
    }

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    while (bsfc) {
        AVPacket new_pkt = *pkt;
        int a = av_bitstream_filter_filter(bsfc, avctx, NULL,
                                           &new_pkt.data, &new_pkt.size,
                                           pkt->data, pkt->size,
                                           pkt->flags & AV_PKT_FLAG_KEY);
        if (a > 0) {
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            av_free_packet(pkt);
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            new_pkt.buf = av_buffer_create(new_pkt.data, new_pkt.size,
                                           av_buffer_default_free, NULL, 0);
            if (!new_pkt.buf)
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                exit_program(1);
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        } else if (a < 0) {
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            av_log(NULL, AV_LOG_ERROR, "%s failed for stream %d, codec %s",
                   bsfc->filter->name, pkt->stream_index,
                   avctx->codec ? avctx->codec->name : "copy");
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            print_error("", a);
            if (exit_on_error)
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                exit_program(1);
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        }
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        *pkt = new_pkt;
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        bsfc = bsfc->next;
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    }

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    if (!(s->oformat->flags & AVFMT_NOTIMESTAMPS) &&
        ost->last_mux_dts != AV_NOPTS_VALUE &&
        pkt->dts < ost->last_mux_dts + !(s->oformat->flags & AVFMT_TS_NONSTRICT)) {
        av_log(NULL, AV_LOG_WARNING, "Non-monotonous DTS in output stream "
               "%d:%d; previous: %"PRId64", current: %"PRId64"; ",
               ost->file_index, ost->st->index, ost->last_mux_dts, pkt->dts);
        if (exit_on_error) {
            av_log(NULL, AV_LOG_FATAL, "aborting.\n");
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            exit_program(1);
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        }
        av_log(NULL, AV_LOG_WARNING, "changing to %"PRId64". This may result "
               "in incorrect timestamps in the output file.\n",
               ost->last_mux_dts + 1);
        pkt->dts = ost->last_mux_dts + 1;
        if (pkt->pts != AV_NOPTS_VALUE)
            pkt->pts = FFMAX(pkt->pts, pkt->dts);
    }
    ost->last_mux_dts = pkt->dts;

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    pkt->stream_index = ost->index;
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    ret = av_interleaved_write_frame(s, pkt);
    if (ret < 0) {
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        print_error("av_interleaved_write_frame()", ret);
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        exit_program(1);
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    }
}

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static int check_recording_time(OutputStream *ost)
{
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    OutputFile *of = output_files[ost->file_index];
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    if (of->recording_time != INT64_MAX &&
        av_compare_ts(ost->sync_opts - ost->first_pts, ost->st->codec->time_base, of->recording_time,
                      AV_TIME_BASE_Q) >= 0) {
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        ost->finished = 1;
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        return 0;
    }
    return 1;
}

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static void do_audio_out(AVFormatContext *s, OutputStream *ost,
                         AVFrame *frame)
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{
    AVCodecContext *enc = ost->st->codec;
    AVPacket pkt;
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    int got_packet = 0;
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    av_init_packet(&pkt);
    pkt.data = NULL;
    pkt.size = 0;

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    if (frame->pts == AV_NOPTS_VALUE || audio_sync_method < 0)
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        frame->pts = ost->sync_opts;
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    ost->sync_opts = frame->pts + frame->nb_samples;
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    if (avcodec_encode_audio2(enc, &pkt, frame, &got_packet) < 0) {
        av_log(NULL, AV_LOG_FATAL, "Audio encoding failed\n");
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        exit_program(1);
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    }

    if (got_packet) {
        if (pkt.pts != AV_NOPTS_VALUE)
            pkt.pts      = av_rescale_q(pkt.pts,      enc->time_base, ost->st->time_base);
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        if (pkt.dts != AV_NOPTS_VALUE)
            pkt.dts      = av_rescale_q(pkt.dts,      enc->time_base, ost->st->time_base);
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        if (pkt.duration > 0)
            pkt.duration = av_rescale_q(pkt.duration, enc->time_base, ost->st->time_base);

        write_frame(s, &pkt, ost);

        audio_size += pkt.size;
    }
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}

static void do_subtitle_out(AVFormatContext *s,
                            OutputStream *ost,
                            InputStream *ist,
                            AVSubtitle *sub,
                            int64_t pts)
{
    static uint8_t *subtitle_out = NULL;
    int subtitle_out_max_size = 1024 * 1024;
    int subtitle_out_size, nb, i;
    AVCodecContext *enc;
    AVPacket pkt;

    if (pts == AV_NOPTS_VALUE) {
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        av_log(NULL, AV_LOG_ERROR, "Subtitle packets must have a pts\n");
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        if (exit_on_error)
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            exit_program(1);
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        return;
    }

    enc = ost->st->codec;

    if (!subtitle_out) {
        subtitle_out = av_malloc(subtitle_out_max_size);
    }

    /* Note: DVB subtitle need one packet to draw them and one other
       packet to clear them */
    /* XXX: signal it in the codec context ? */
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    if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
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        nb = 2;
    else
        nb = 1;

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    for (i = 0; i < nb; i++) {
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        ost->sync_opts = av_rescale_q(pts, ist->st->time_base, enc->time_base);
        if (!check_recording_time(ost))
            return;

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        sub->pts = av_rescale_q(pts, ist->st->time_base, AV_TIME_BASE_Q);
        // start_display_time is required to be 0
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        sub->pts               += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, AV_TIME_BASE_Q);
        sub->end_display_time  -= sub->start_display_time;
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        sub->start_display_time = 0;
        subtitle_out_size = avcodec_encode_subtitle(enc, subtitle_out,
                                                    subtitle_out_max_size, sub);
        if (subtitle_out_size < 0) {
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            av_log(NULL, AV_LOG_FATAL, "Subtitle encoding failed\n");
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            exit_program(1);
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        }

        av_init_packet(&pkt);
        pkt.data = subtitle_out;
        pkt.size = subtitle_out_size;
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        pkt.pts  = av_rescale_q(sub->pts, AV_TIME_BASE_Q, ost->st->time_base);
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        if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
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            /* XXX: the pts correction is handled here. Maybe handling
               it in the codec would be better */
            if (i == 0)
                pkt.pts += 90 * sub->start_display_time;
            else
                pkt.pts += 90 * sub->end_display_time;
        }
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        write_frame(s, &pkt, ost);
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    }
}

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static void do_video_out(AVFormatContext *s,
                         OutputStream *ost,
                         AVFrame *in_picture,
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                         int *frame_size)
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{
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    int ret, format_video_sync;
    AVPacket pkt;
    AVCodecContext *enc = ost->st->codec;
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    *frame_size = 0;

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    format_video_sync = video_sync_method;
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    if (format_video_sync == VSYNC_AUTO)
        format_video_sync = (s->oformat->flags & AVFMT_NOTIMESTAMPS) ? VSYNC_PASSTHROUGH :
                            (s->oformat->flags & AVFMT_VARIABLE_FPS) ? VSYNC_VFR : VSYNC_CFR;
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    if (format_video_sync != VSYNC_PASSTHROUGH &&
        ost->frame_number &&
        in_picture->pts != AV_NOPTS_VALUE &&
        in_picture->pts < ost->sync_opts) {
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        nb_frames_drop++;
        av_log(NULL, AV_LOG_VERBOSE, "*** drop!\n");
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        return;
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    }
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    if (in_picture->pts == AV_NOPTS_VALUE)
        in_picture->pts = ost->sync_opts;
    ost->sync_opts = in_picture->pts;


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    if (!ost->frame_number)
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        ost->first_pts = in_picture->pts;
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    av_init_packet(&pkt);
    pkt.data = NULL;
    pkt.size = 0;
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    if (ost->frame_number >= ost->max_frames)
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        return;
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    if (s->oformat->flags & AVFMT_RAWPICTURE &&
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        enc->codec->id == AV_CODEC_ID_RAWVIDEO) {
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        /* raw pictures are written as AVPicture structure to
           avoid any copies. We support temporarily the older
           method. */
        enc->coded_frame->interlaced_frame = in_picture->interlaced_frame;
        enc->coded_frame->top_field_first  = in_picture->top_field_first;
        pkt.data   = (uint8_t *)in_picture;
        pkt.size   =  sizeof(AVPicture);
        pkt.pts    = av_rescale_q(in_picture->pts, enc->time_base, ost->st->time_base);
        pkt.flags |= AV_PKT_FLAG_KEY;
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        write_frame(s, &pkt, ost);
    } else {
        int got_packet;
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        if (ost->st->codec->flags & (CODEC_FLAG_INTERLACED_DCT|CODEC_FLAG_INTERLACED_ME) &&
            ost->top_field_first >= 0)
            in_picture->top_field_first = !!ost->top_field_first;

        in_picture->quality = ost->st->codec->global_quality;
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        if (!enc->me_threshold)
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            in_picture->pict_type = 0;
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        if (ost->forced_kf_index < ost->forced_kf_count &&
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            in_picture->pts >= ost->forced_kf_pts[ost->forced_kf_index]) {
            in_picture->pict_type = AV_PICTURE_TYPE_I;
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            ost->forced_kf_index++;
        }
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        ret = avcodec_encode_video2(enc, &pkt, in_picture, &got_packet);
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        if (ret < 0) {
            av_log(NULL, AV_LOG_FATAL, "Video encoding failed\n");
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            exit_program(1);
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        }
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        if (got_packet) {
            if (pkt.pts != AV_NOPTS_VALUE)
                pkt.pts = av_rescale_q(pkt.pts, enc->time_base, ost->st->time_base);
            if (pkt.dts != AV_NOPTS_VALUE)
                pkt.dts = av_rescale_q(pkt.dts, enc->time_base, ost->st->time_base);
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            write_frame(s, &pkt, ost);
            *frame_size = pkt.size;
            video_size += pkt.size;
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            /* if two pass, output log */
            if (ost->logfile && enc->stats_out) {
                fprintf(ost->logfile, "%s", enc->stats_out);
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            }
        }
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    }
    ost->sync_opts++;
    /*
     * For video, number of frames in == number of packets out.
     * But there may be reordering, so we can't throw away frames on encoder
     * flush, we need to limit them here, before they go into encoder.
     */
    ost->frame_number++;
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}

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static double psnr(double d)
{
    return -10.0 * log(d) / log(10.0);
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}

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static void do_video_stats(OutputStream *ost, int frame_size)
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{
    AVCodecContext *enc;
    int frame_number;
    double ti1, bitrate, avg_bitrate;

    /* this is executed just the first time do_video_stats is called */
    if (!vstats_file) {
        vstats_file = fopen(vstats_filename, "w");
        if (!vstats_file) {
            perror("fopen");
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            exit_program(1);
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        }
    }

    enc = ost->st->codec;
    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
        frame_number = ost->frame_number;
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        fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number, enc->coded_frame->quality / (float)FF_QP2LAMBDA);
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        if (enc->flags&CODEC_FLAG_PSNR)
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            fprintf(vstats_file, "PSNR= %6.2f ", psnr(enc->coded_frame->error[0] / (enc->width * enc->height * 255.0 * 255.0)));
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        fprintf(vstats_file,"f_size= %6d ", frame_size);
        /* compute pts value */
        ti1 = ost->sync_opts * av_q2d(enc->time_base);
        if (ti1 < 0.01)
            ti1 = 0.01;

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        bitrate     = (frame_size * 8) / av_q2d(enc->time_base) / 1000.0;
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        avg_bitrate = (double)(video_size * 8) / ti1 / 1000.0;
        fprintf(vstats_file, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
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               (double)video_size / 1024, ti1, bitrate, avg_bitrate);
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        fprintf(vstats_file, "type= %c\n", av_get_picture_type_char(enc->coded_frame->pict_type));
    }
}

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/*
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 * Read one frame for lavfi output for ost and encode it.
 */
static int poll_filter(OutputStream *ost)
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{
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    OutputFile    *of = output_files[ost->file_index];
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    AVFrame *filtered_frame = NULL;
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    int frame_size, ret;

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    if (!ost->filtered_frame && !(ost->filtered_frame = av_frame_alloc())) {
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        return AVERROR(ENOMEM);
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    }
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    filtered_frame = ost->filtered_frame;

    if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
        !(ost->enc->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE))
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        ret = av_buffersink_get_samples(ost->filter->filter, filtered_frame,
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                                         ost->st->codec->frame_size);
    else
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        ret = av_buffersink_get_frame(ost->filter->filter, filtered_frame);
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    if (ret < 0)
        return ret;
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    if (filtered_frame->pts != AV_NOPTS_VALUE) {
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        int64_t start_time = (of->start_time == AV_NOPTS_VALUE) ? 0 : of->start_time;
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        filtered_frame->pts = av_rescale_q(filtered_frame->pts,
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                                           ost->filter->filter->inputs[0]->time_base,
                                           ost->st->codec->time_base) -
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                              av_rescale_q(start_time,
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                                           AV_TIME_BASE_Q,
                                           ost->st->codec->time_base);
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    }
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    switch (ost->filter->filter->inputs[0]->type) {
    case AVMEDIA_TYPE_VIDEO:
        if (!ost->frame_aspect_ratio)
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            ost->st->codec->sample_aspect_ratio = filtered_frame->sample_aspect_ratio;
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        do_video_out(of->ctx, ost, filtered_frame, &frame_size);
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        if (vstats_filename && frame_size)
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            do_video_stats(ost, frame_size);
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        break;
    case AVMEDIA_TYPE_AUDIO:
        do_audio_out(of->ctx, ost, filtered_frame);
        break;
    default:
        // TODO support subtitle filters
        av_assert0(0);
    }

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    av_frame_unref(filtered_frame);
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    return 0;
}

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/*
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 * Read as many frames from possible from lavfi and encode them.
 *
 * Always read from the active stream with the lowest timestamp. If no frames
 * are available for it then return EAGAIN and wait for more input. This way we
 * can use lavfi sources that generate unlimited amount of frames without memory
 * usage exploding.
 */
static int poll_filters(void)
{
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    int i, j, ret = 0;
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    while (ret >= 0 && !received_sigterm) {
        OutputStream *ost = NULL;
        int64_t min_pts = INT64_MAX;

        /* choose output stream with the lowest timestamp */
        for (i = 0; i < nb_output_streams; i++) {
            int64_t pts = output_streams[i]->sync_opts;

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            if (!output_streams[i]->filter || output_streams[i]->finished)
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                continue;

            pts = av_rescale_q(pts, output_streams[i]->st->codec->time_base,
                               AV_TIME_BASE_Q);
            if (pts < min_pts) {
                min_pts = pts;
                ost = output_streams[i];
            }
        }

        if (!ost)
            break;

        ret = poll_filter(ost);

        if (ret == AVERROR_EOF) {
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            OutputFile *of = output_files[ost->file_index];

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            ost->finished = 1;
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            if (of->shortest) {
                for (j = 0; j < of->ctx->nb_streams; j++)
                    output_streams[of->ost_index + j]->finished = 1;
            }
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            ret = 0;
        } else if (ret == AVERROR(EAGAIN))
            return 0;
    }

    return ret;
}

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static void print_report(int is_last_report, int64_t timer_start)
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{
    char buf[1024];
    OutputStream *ost;
    AVFormatContext *oc;
    int64_t total_size;
    AVCodecContext *enc;
    int frame_number, vid, i;
    double bitrate, ti1, pts;
    static int64_t last_time = -1;
    static int qp_histogram[52];

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    if (!print_stats && !is_last_report)
        return;

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    if (!is_last_report) {
        int64_t cur_time;
        /* display the report every 0.5 seconds */
        cur_time = av_gettime();
        if (last_time == -1) {
            last_time = cur_time;
            return;
        }
        if ((cur_time - last_time) < 500000)
            return;
        last_time = cur_time;
    }


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    oc = output_files[0]->ctx;
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    total_size = avio_size(oc->pb);
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    if (total_size <= 0) // FIXME improve avio_size() so it works with non seekable output too
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        total_size = avio_tell(oc->pb);
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    if (total_size < 0) {
        char errbuf[128];
        av_strerror(total_size, errbuf, sizeof(errbuf));
        av_log(NULL, AV_LOG_VERBOSE, "Bitrate not available, "
               "avio_tell() failed: %s\n", errbuf);
        total_size = 0;
    }
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    buf[0] = '\0';
    ti1 = 1e10;
    vid = 0;
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    for (i = 0; i < nb_output_streams; i++) {
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        float q = -1;
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        ost = output_streams[i];
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        enc = ost->st->codec;
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        if (!ost->stream_copy && enc->coded_frame)
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            q = enc->coded_frame->quality / (float)FF_QP2LAMBDA;
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        if (vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
            snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "q=%2.1f ", q);
        }
        if (!vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
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            float t = (av_gettime() - timer_start) / 1000000.0;
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            frame_number = ost->frame_number;
            snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "frame=%5d fps=%3d q=%3.1f ",
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                     frame_number, (t > 1) ? (int)(frame_number / t + 0.5) : 0, q);
            if (is_last_report)
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                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "L");
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            if (qp_hist) {
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                int j;
                int qp = lrintf(q);
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                if (qp >= 0 && qp < FF_ARRAY_ELEMS(qp_histogram))
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                    qp_histogram[qp]++;
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                for (j = 0; j < 32; j++)
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                    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%X", (int)lrintf(log2(qp_histogram[j] + 1)));
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            }
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            if (enc->flags&CODEC_FLAG_PSNR) {
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                int j;
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                double error, error_sum = 0;
                double scale, scale_sum = 0;
                char type[3] = { 'Y','U','V' };
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                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "PSNR=");
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                for (j = 0; j < 3; j++) {
                    if (is_last_report) {
                        error = enc->error[j];
                        scale = enc->width * enc->height * 255.0 * 255.0 * frame_number;
                    } else {
                        error = enc->coded_frame->error[j];
                        scale = enc->width * enc->height * 255.0 * 255.0;
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                    }
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                    if (j)
                        scale /= 4;
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                    error_sum += error;
                    scale_sum += scale;
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                    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%c:%2.2f ", type[j], psnr(error / scale));
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                }
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                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "*:%2.2f ", psnr(error_sum / scale_sum));
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            }
            vid = 1;
        }
        /* compute min output value */
        pts = (double)ost->st->pts.val * av_q2d(ost->st->time_base);
        if ((pts < ti1) && (pts > 0))
            ti1 = pts;
    }
    if (ti1 < 0.01)
        ti1 = 0.01;

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    bitrate = (double)(total_size * 8) / ti1 / 1000.0;
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    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
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            "size=%8.0fkB time=%0.2f bitrate=%6.1fkbits/s",
            (double)total_size / 1024, ti1, bitrate);

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    if (nb_frames_dup || nb_frames_drop)
        snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " dup=%d drop=%d",
                nb_frames_dup, nb_frames_drop);
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    av_log(NULL, AV_LOG_INFO, "%s    \r", buf);
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    fflush(stderr);
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    if (is_last_report) {
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        int64_t raw   = audio_size + video_size + extra_size;
        float percent = 0.0;

        if (raw)
            percent = 100.0 * (total_size - raw) / raw;

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        av_log(NULL, AV_LOG_INFO, "\n");
        av_log(NULL, AV_LOG_INFO, "video:%1.0fkB audio:%1.0fkB global headers:%1.0fkB muxing overhead %f%%\n",
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               video_size / 1024.0,
               audio_size / 1024.0,
               extra_size / 1024.0,
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               percent);
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    }
}

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static void flush_encoders(void)
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{
    int i, ret;

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    for (i = 0; i < nb_output_streams; i++) {
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        OutputStream   *ost = output_streams[i];
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        AVCodecContext *enc = ost->st->codec;
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        AVFormatContext *os = output_files[ost->file_index]->ctx;
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        int stop_encoding = 0;
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        if (!ost->encoding_needed)
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            continue;

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        if (ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO && enc->frame_size <= 1)
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            continue;
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        if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (os->oformat->flags & AVFMT_RAWPICTURE) && enc->codec->id == AV_CODEC_ID_RAWVIDEO)
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            continue;

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        for (;;) {
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            int (*encode)(AVCodecContext*, AVPacket*, const AVFrame*, int*) = NULL;
            const char *desc;
            int64_t *size;
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            switch (ost->st->codec->codec_type) {
            case AVMEDIA_TYPE_AUDIO:
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                encode = avcodec_encode_audio2;
                desc   = "Audio";
                size   = &audio_size;
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                break;
            case AVMEDIA_TYPE_VIDEO:
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                encode = avcodec_encode_video2;
                desc   = "Video";
                size   = &video_size;
                break;
            default:
                stop_encoding = 1;
            }

            if (encode) {
                AVPacket pkt;
                int got_packet;
                av_init_packet(&pkt);
                pkt.data = NULL;
                pkt.size = 0;

                ret = encode(enc, &pkt, NULL, &got_packet);
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                if (ret < 0) {
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                    av_log(NULL, AV_LOG_FATAL, "%s encoding failed\n", desc);
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