[Libav-user] Muxing sample under 'docs' section compatibility with webm format

Taha Ansari mtaha.ansari at gmail.com
Thu Jan 9 13:44:40 CET 2014


I am using FFmpeg zeranoe build downloaded on Aug 30 2013. Running
ffmpeg.exe outputs following data:

ffmpeg version N-55922-g454a11a Copyright (c) 2000-2013 the FFmpeg
  built on Aug 30 2013 18:04:08 with gcc 4.7.3 (GCC)
  configuration: --disable-static --enable-shared --enable-gpl
 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig
ble-frei0r --enable-gnutls --enable-iconv --enable-libass
--enable-libbluray --e
nable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc
modplug --enable-libmp3lame --enable-libopencore-amrnb
b --enable-libopenjpeg --enable-libopus --enable-librtmp
r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame
able-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx --e
nable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 43.100 / 52. 43.100
  libavcodec     55. 29.100 / 55. 29.100
  libavformat    55. 15.100 / 55. 15.100
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 82.102 /  3. 82.102
  libswscale      2.  5.100 /  2.  5.100
  libswresample   0. 17.103 /  0. 17.103
  libpostproc    52.  3.100 / 52.  3.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options]

I compiled and ran muxing.c sample under windows; while it is working for
some other common formats, for webm file, I get the video content, but
dummy audio is not audible. Looking further, I discover that audio_pts
values are greatly off. Also read this bug report here:
http://trac.ffmpeg.org/ticket/3231 ,  but I don't know if it was resolved
(and Windows build uploaded).

Does anyone have working muxing.c code that spews correct audio_pts values
(hence audible audio)? Merely following the patch that OP posted in above
link only provides starting few samples to be audible, rest is still

Code hosted here: https://gist.github.com/anonymous/12a6210985814c9d5f09

Thanks for any pointers in advance.
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