1. 15 Feb, 2017 1 commit
    • Ranjit Kumar Tulabandu's avatar
      Row based multi-threading of encoding stage · 71061e93
      Ranjit Kumar Tulabandu authored
      (Yunqing Wang)
      This patch implements the row-based multi-threading within tiles in
      the encoding pass, and substantially speeds up the multi-threaded
      encoder in VP9.
      
      Speed tests at speed 1 on STDHD(using 4 tiles) set show that the
      average speedups of the encoding pass(second pass in the 2-pass
      encoding) is 7% while using 2 threads, 16% while using 4 threads,
      85% while using 8 threads, and 116% while using 16 threads.
      
      Change-Id: I12e41dbc171951958af9e6d098efd6e2c82827de
      71061e93
  2. 07 Feb, 2017 1 commit
  3. 24 Jan, 2017 1 commit
  4. 10 Sep, 2015 1 commit
  5. 04 Dec, 2014 1 commit
    • Yunqing Wang's avatar
      vp9_ethread: the tile-based multi-threaded encoder · eba9c762
      Yunqing Wang authored
      Currently, VP9 supports column-tile encoding, which allows a frame
      to be encoded in multiple column tiles independently. The number of
      column tiles are set by encoder option "--tile-columns". This
      provides a way to encode a frame in parallel.
      
      Based on previous set of patches, this patch implemented the tile-
      based multi-threaded encoder. Each thread processes one or more
      tiles.
      
      Usage:
      For HD clips:
      --tile-columns=2 --threads=1/2/3/4
      
      While using 4 threads, tests showed that the encoder achieved
      2.3X - 2.5X speedup at good-quality speed 3, and 2X speedup at
      realtime speed 5.
      
      Change-Id: Ied987f8f2618b1283a8643ad255e88341733c9d4
      eba9c762
  6. 06 Feb, 2014 1 commit
    • Dmitry Kovalev's avatar
      Adding video reader/writer APIs. · 37e6fd3d
      Dmitry Kovalev authored
      Right now only IVF format is supported which is enough for example code.
      Other formats like y4m, webm, raw yuv will be supported later.
      
      Change-Id: I34c6f20731c1851947587ca5c589d7856b675164
      37e6fd3d
  7. 24 Jan, 2014 1 commit
  8. 17 Dec, 2013 1 commit
  9. 01 Nov, 2012 1 commit
  10. 31 Oct, 2012 1 commit
  11. 15 Mar, 2012 1 commit
    • Yaowu Xu's avatar
      WebM Experimental Codec Branch Snapshot · 6035da54
      Yaowu Xu authored
      This is a code snapshot of experimental work currently ongoing for a
      next-generation codec.
      
      The codebase has been cut down considerably from the libvpx baseline.
      For example, we are currently only supporting VBR 2-pass rate control
      and have removed most of the code relating to coding speed, threading,
      error resilience, partitions and various other features.  This is in
      part to make the codebase easier to work on and experiment with, but
      also because we want to have an open discussion about how the bitstream
      will be structured and partitioned and not have that conversation
      constrained by past work.
      
      Our basic working pattern has been to initially encapsulate experiments
      using configure options linked to #IF CONFIG_XXX statements in the
      code. Once experiments have matured and we are reasonably happy that
      they give benefit and can be merged without breaking other experiments,
      we remove the conditional compile statements and merge them in.
      
      Current changes include:
      * Temporal coding experiment for segments (though still only 4 max, it
        will likely be increased).
      * Segment feature experiment - to allow various bits of information to
        be coded at the segment level. Features tested so far include mode
        and reference frame information, limiting end of block offset and
        transform size, alongside Q and loop filter parameters, but this set
        is very fluid.
      * Support for 8x8 transform - 8x8 dct with 2nd order 2x2 haar is used
        in MBs using 16x16 prediction modes within inter frames.
      * Compound prediction (combination of signals from existing predictors
        to create a new predictor).
      * 8 tap interpolation filters and 1/8th pel motion vectors.
      * Loop filter modifications.
      * Various entropy modifications and changes to how entropy contexts and
        updates are handled.
      * Extended quantizer range matched to transform precision improvements.
      
      There are also ongoing further experiments that we hope to merge in the
      near future: For example, coding of motion and other aspects of the
      prediction signal to better support larger image formats, use of larger
      block sizes (e.g. 32x32 and up) and lossless non-transform based coding
      options (especially for key frames). It is our hope that we will be
      able to make regular updates and we will warmly welcome community
      contributions.
      
      Please be warned that, at this stage, the codebase is currently slower
      than VP8 stable branch as most new code has not been optimized, and
      even the 'C' has been deliberately written to be simple and obvious,
      not fast.
      
      The following graphs have the initial test results, numbers in the
      tables measure the compression improvement in terms of percentage. The
      build has  the following optional experiments configured:
      --enable-experimental --enable-enhanced_interp --enable-uvintra
      --enable-high_precision_mv --enable-sixteenth_subpel_uv
      
      CIF Size clips:
      http://getwebm.org/tmp/cif/
      HD size clips:
      http://getwebm.org/tmp/hd/
      (stable_20120309 represents encoding results of WebM master branch
      build as of commit#7a159071)
      
      They were encoded using the following encode parameters:
      --good --cpu-used=0 -t 0 --lag-in-frames=25 --min-q=0 --max-q=63
      --end-usage=0 --auto-alt-ref=1 -p 2 --pass=2 --kf-max-dist=9999
      --kf-min-dist=0 --drop-frame=0 --static-thresh=0 --bias-pct=50
      --minsection-pct=0 --maxsection-pct=800 --sharpness=0
      --arnr-maxframes=7 --arnr-strength=3(for HD,6 for CIF)
      --arnr-type=3
      
      Change-Id: I5c62ed09cfff5815a2bb34e7820d6a810c23183c
      6035da54
  12. 06 Feb, 2012 1 commit
    • Paul Wilkins's avatar
      Merged NEWNEAR experiment · 9c9300f5
      Paul Wilkins authored
      This commit merges the NEWNEAR experiment such that it
      is effectively always on.
      
      The fact that there were changes in the threading code again
      highlights the need to strip out such features during the
      bitstream development phase as trying to maintain this code
      (especially as it is not being tested) slows the development cycle.
      
      Change-Id: I8b34950a1333231ced9928aa11cd6d6459984b65
      9c9300f5
  13. 09 Dec, 2011 1 commit
  14. 07 Dec, 2011 1 commit
  15. 09 Sep, 2010 1 commit
  16. 18 Jun, 2010 1 commit
    • John Koleszar's avatar
      cosmetics: trim trailing whitespace · 94c52e4d
      John Koleszar authored
      When the license headers were updated, they accidentally contained
      trailing whitespace, so unfortunately we have to touch all the files
      again.
      
      Change-Id: I236c05fade06589e417179c0444cb39b09e4200d
      94c52e4d
  17. 04 Jun, 2010 1 commit
  18. 18 May, 2010 1 commit