[mythtv-users] No sound in VLC on Windows for 0.21 DVB recordings in .au

Patrick Nichols lists at panic.id.au
Wed May 7 13:15:20 UTC 2008


Further information:

Since I have a 0.20.2 system and a 0.21.0 system running at the same 
time with identical tuners I was able to record the same show on both 
systems at the same time, here are the results.

This recording is 0.20.2 latest fixes Sound works with VLC
mythtv_0.20.2+fixes16082

[mutton:/media/data/mythtv$] ffmpeg -i 
1021_20080507223600.mpg                  ffmpeg version CVS, build 
3276800, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --extra-cflags=-fomit-frame-pointer 
-DRUNTIME_CPUDETECT --build i486-linux-gnu --enable-gpl --enable-pp 
--enable-zlib --enable-vorbis --enable-libogg --enable-theora 
--enable-a52 --enable-dts --enable-dc1394 --enable-libgsm 
--disable-debug --prefix=/usr
  built on Oct  4 2006 10:57:36, gcc: 4.0.3 (Ubuntu 4.0.3-1ubuntu5)
Input #0, mpegts, from '1021_20080507223600.mpg':
  Duration: 00:01:29.1, start: 70479.951722, bitrate: 5306 kb/s
  Stream #0.0[0x903]: Video: mpeg2video, yuv420p, 720x576, 25.00 fps, 
15000 kb/s
  Stream #0.1[0x904](eng): Audio: mp2, 48000 Hz, stereo, 256 kb/s
Must supply at least one output file
[mutton:/media/data/mythtv$]


This recording is 0.21 latest mythbuntu weekly fixes build no sound with 
vlc.
0.21.0+fixes17145

pat at shank:/var/lib/mythtv/recordings$ ffmpeg -i 1022_20080507223700.mpg
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --enable-gpl --enable-pp --enable-swscaler 
--enable-pthreads --enable-libvorbis --enable-libtheora --enable-libogg 
--enable-libgsm --enable-dc1394 --disable-debug --enable-shared 
--prefix=/usr
  libavutil version: 1d.49.3.0
  libavcodec version: 1d.51.38.0
  libavformat version: 1d.51.10.0
  built on Mar 12 2008 14:31:53, gcc: 4.2.3 (Ubuntu 4.2.3-2ubuntu4)
Input #0, mpegts, from '1022_20080507223700.mpg':
  Duration: 00:01:18.2, start: 70513.527722, bitrate: 5251 kb/s
  Stream #0.0[0x903]: Video: mpeg2video, yuv420p, 720x576, 15000 kb/s, 
25.00 fps(r)
  Stream #0.1[0x904](eng): Audio: mp2, 48000 Hz, stereo, 256 kb/s
Must supply at least one output file
pat at shank:/var/lib/mythtv/recordings$

Using ffmpeg to perform a lossless transcode of the recording works, and 
there is now audio in vlc.

pat at shank:/var/lib/mythtv/recordings$ ffmpeg -i 1022_20080507223700.mpg 
-acodec copy -vcodec copy 1022_20080507223700-repaired.mpg
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --enable-gpl --enable-pp --enable-swscaler 
--enable-pthreads --enable-libvorbis --enable-libtheora --enable-libogg 
--enable-libgsm --enable-dc1394 --disable-debug --enable-shared 
--prefix=/usr
  libavutil version: 1d.49.3.0
  libavcodec version: 1d.51.38.0
  libavformat version: 1d.51.10.0
  built on Mar 12 2008 14:31:53, gcc: 4.2.3 (Ubuntu 4.2.3-2ubuntu4)
Input #0, mpegts, from '1022_20080507223700.mpg':
  Duration: 00:23:19.1, start: 70513.527722, bitrate: 5277 kb/s
  Stream #0.0[0x903]: Video: mpeg2video, yuv420p, 720x576, 15000 kb/s, 
25.00 fps(r)
  Stream #0.1[0x904](eng): Audio: mp2, 48000 Hz, stereo, 256 kb/s
Output #0, mpeg, to '1022_20080507223700-repaired.mpg':
  Stream #0.0: Video: mpeg2video, yuv420p, 720x576, q=2-31, 15000 kb/s, 
25.00 fps(c)
  Stream #0.1: Audio: 0x0000, 48000 Hz, stereo, 256 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
frame=34974 q=0.1 Lsize=  798594kB time=1399.0 bitrate=4676.4kbits/s
video:751278kB audio:43712kB global headers:0kB muxing overhead 0.453246%
pat at shank:/var/lib/mythtv/recordings$


Any ideas on if this is a bug or not?

-- 
Patrick Nichols.


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