[FFmpeg-trac] #3394(undetermined:new): mp4 -> mkv produces broken file

[FFmpeg]

#3394: mp4 -> mkv produces broken file
-------------------------------------+-------------------------------------
             Reporter:  tessus       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 I copy a video stream and convert an aac audio stream from an mp4 file to
 an mkv file. The resulting mkv file is broken. It doesn't play on HW
 players (e.g. WD TV Media box) and stops in VLC as well.

 How to reproduce:
 {{{
 % ffmpeg -i inp.mp4 -i inp.srt -map 0:0 -vcodec copy -map 0:1 -acodec ac3
 -b:a 384k -af volume=2 -map 1:0 -scodec copy -metadata:s:1 language=eng
 -metadata:s:2 language=eng -metadata title="Title here" "out.mkv"

 ffmpeg version N-60689-g8309171-tessus Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Feb 16 2014 19:49:23 with llvm-gcc 4.2.1 (LLVM build 2336.1.00)
   configuration: --prefix=/Users/tessus/data/ext/ffmpeg/sw --as=yasm
 --extra-version=tessus --disable-shared --enable-static --disable-ffplay
 --enable-gpl --enable-pthreads --enable-postproc --enable-libmp3lame
 --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid
 --enable-libspeex --enable-bzlib --enable-zlib --enable-libopencore-amrnb
 --enable-libopencore-amrwb --enable-libxavs --enable-version3 --enable-
 libvo-aacenc --enable-libvo-amrwbenc --enable-libvpx --enable-libgsm
 --enable-libopus --enable-libmodplug --enable-fontconfig --enable-
 libfreetype --enable-libass --enable-libbluray --enable-filters --enable-
 runtime-cpudetect
   libavutil      52. 64.100 / 52. 64.100
   libavcodec     55. 52.102 / 55. 52.102
   libavformat    55. 33.100 / 55. 33.100
   libavdevice    55.  9.101 / 55.  9.101
   libavfilter     4.  1.102 /  4.  1.102
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 }}}

 The last good version I have on my disk is from Feb. 4th. The first bad
 version was around Feb. 7th. Since then the output files are broken.

 I have uploaded 3 files to upload.ffmpeg.org (cut off after 4MB):

 1) input file: mp4-mkv-input.mp4
 2) good output file (674195c): mp4-mkv-good.mkv
 3) bad output file (8309171): mp4-mkv-broken.mkv

 I suspect that the mkv structure of the output file is garbled. Maybe you
 guys have tools to check the integrity of containers.
 Since the video stream is copied, I can't believe that the stream is the
 problem.
 I used several different input files - same result, so it's not the input
 file either.
 ffmpeg 2.1.3 does not have the problem.

 Maybe you have an idea what was changed after Feb 4th that would screw up
 the output file.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3394>
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