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We were using it to know the real bitrate used by the encoder, but this
method induces crashes on Android < 4.2 (on emulator or real devices)

And fix multi-frames per packet issue

Minor improvments:
- cache decoder/encoder output/input Buffers
- compute codec_bitrate from network_bitrate

Major improvment:
Only query decoder/encoder (pullFrom* methods) when f->inputs[0] is not empty.
My current guess is doing so reduce pressure on the JNI/Java/MediaCode/OMX
 codepath and help improve performance.
Otherwise, it's impossible to get sound working reliably at sample rates > 22kHz

revert change about getting fps from camera, since there is confusion between obtained fps and measured fps

Added a new filter (aac-eld-android.cpp) which uses JNI to access
MediaCodec Java interface (AACFilter.java).
The codec is named 'AAC-ELD' in Linphone's preference, even if its
mimetype is 'mpeg4-generic'.
AAC is disabled on Android < 16 and on device without a hardware echo
canceller.

modify the handling of gold, altref and last reference frames in order to avoid video to be blurred at each gold or altref frame generated.

A resampler filter is created instead

Use a realistic value for processing time, in order to get better image quality.

Conflicts:
	src/videofilters/mkv.c