[MEncoder-users] mencoder -oac copy and ac3

Thu Mar 8 03:41:28 CET 2012

I've never been able to get -oac copy for an AC3 file .
I had to build my script to demux and remux to get around it.
I'd say consider yourself lucky that it worked as long as it did.

On Mar 7, 2012, at 8:33 PM, Mike Castle wrote:

> I'd been happily using a mencoder I built from tip a few months ago.
> Recently I updated and something broke.  Of course, I didn't capture
> what version I was using before (if svn has that kind of history, I'd
> dig it out).
> 
> Anyway, from researching the problem, it appears this may fall into
> the realm of ``This was never supported and if it worked at all it was
> by accident; consider yourself lucky that it worked that long.''  If
> so, then I won't bother trying to figure out when the error was
> introduced.  In some hits I've seen, it looks like trying to use -oac
> copy with AC3 was unsupported, but I think those were posted prior to
> me having an actual working binary at some point.
> 
> So, onto the error.
> 
> I have a vob file ripped from a DVD.  If I try to do something like:
> mencoder -quiet -endpos 00:03:00 -oac copy -ovc copy -o a.avi a.vob
> 
> I get this:
> MEncoder SVN-r34790-4.6 (C) 2000-2012 MPlayer Team
> success: format: 0  data: 0x0 - 0x41bac000
> libavformat version 54.2.100 (internal)
> MPEG-PS file format detected.
> VIDEO:  MPEG2  720x480  (aspect 3)  29.970 fps  5726.0 kbps (715.8 kbyte/s)
> [V] filefmt:2  fourcc:0x10000002  size:720x480  fps:29.970  ftime:=0.0334
> ==========================================================================
> Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
> libavcodec version 54.6.100 (internal)
> AUDIO: 48000 Hz, 2 ch, s16le, 192.0 kbit/12.50% (ratio: 24000->192000)
> Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3)
> ==========================================================================
> videocodec: framecopy (720x480 24bpp fourcc=10000002)
> audiocodec: framecopy (format=2000 chans=2 rate=48000 bits=16
> B/s=24000 sample-1)
> Writing header...
> ODML: Aspect information not (yet?) available or unspecified, not
> writing vprp header.
> Writing header...
> ODML: Aspect information not (yet?) available or unspecified, not
> writing vprp header.
> 
> demux_mpg: 24000/1001fps progressive NTSC content detected, switching framerate.
> 
> Too many video packets in the buffer: (4096 in 8278781 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> 
> Too many video packets in the buffer: (4096 in 8275684 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> 
> Too many video packets in the buffer: (4096 in 8279156 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> 
> Too many video packets in the buffer: (4096 in 8271258 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> 
> Too many video packets in the buffer: (4096 in 8277435 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> 
> Too many video packets in the buffer: (4096 in 8275056 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> 
> Too many video packets in the buffer: (4096 in 8273038 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> 
> Too many video packets in the buffer: (4096 in 8278307 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> 
> Too many video packets in the buffer: (4096 in 8277483 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> 
> Too many video packets in the buffer: (4096 in 8274280 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> Writing index...
> Writing header...
> ODML: Aspect information not (yet?) available or unspecified, not
> writing vprp header.
> 
> Video stream: 6426.393 kbit/s  (803299 B/s)  size: 144604416 bytes
> 180.013 secs  3946 frames
> 
> Audio stream:  192.000 kbit/s  (24000 B/s)  size: 3962400 bytes  165.100 secs
> 
> 
> 
> In watching a.avi, audio looks like the right speed, but the video is
> slow.  In particular, I can tell that an scene change which should
> happen at 2:30 is delayed until 2:45.  This is consistent with doing
> the whole track, and independent of using -ovc copy or something other
> codec.
> 
> If I use -oac pcm, everything works fine, but of course the audio
> track is then large.
> 
> 
> In trying some random prebuilt versions that I can find in the Debian
> archive, I can verify that this worked as of r31918 and failing with
> r34728.
> 
> 
> Some maybe useful information:
> 
> $ mplayer -frames 0 -identify a.vob
> MPlayer SVN-r34790-4.6 (C) 2000-2012 MPlayer Team
> 
> Playing a.vob.
> libavformat version 54.2.100 (internal)
> ID_VIDEO_ID=0
> ID_AUDIO_ID=128
> MPEG-PS file format detected.
> VIDEO:  MPEG2  720x480  (aspect 3)  29.970 fps  5726.0 kbps (715.8 kbyte/s)
> Load subtitles in ./
> ID_FILENAME=a.vob
> ID_DEMUXER=mpegps
> ID_VIDEO_FORMAT=0x10000002
> ID_VIDEO_BITRATE=5726000
> ID_VIDEO_WIDTH=720
> ID_VIDEO_HEIGHT=480
> ID_VIDEO_FPS=29.970
> ID_VIDEO_ASPECT=0.0000
> ID_AUDIO_FORMAT=8192
> ID_AUDIO_BITRATE=0
> ID_AUDIO_RATE=0
> ID_AUDIO_NCH=0
> ID_START_TIME=0.22
> ID_LENGTH=7541.36
> ID_SEEKABLE=1
> ID_CHAPTERS=0
> ==========================================================================
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> libavcodec version 54.6.100 (internal)
> Selected video codec: [ffmpeg2] vfm: ffmpeg (FFmpeg MPEG-2)
> ==========================================================================
> ID_VIDEO_CODEC=ffmpeg2
> ==========================================================================
> Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
> AUDIO: 48000 Hz, 2 ch, s16le, 192.0 kbit/12.50% (ratio: 24000->192000)
> ID_AUDIO_BITRATE=192000
> ID_AUDIO_RATE=48000
> ID_AUDIO_NCH=2
> Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3)
> ==========================================================================
> AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
> ID_AUDIO_CODEC=ffac3
> Starting playback...
> 
> 
> Exiting... (End of file)
> ID_EXIT=EOF
> 
> 
> Output from an older version that works:
> $ LD_LIBRARY_PATH=/home/nexus/t/menc/usr/lib
> /home/nexus/t/menc/usr/bin/mencoder -endpos 00:03:00 -quiet -oac copy
> -ovc copy -o a.avi a.vob
> MPlayer SVN-r31918 (C) 2000-2010 MPlayer Team
> success: format: 0  data: 0x0 - 0x41bac000
> MPEG-PS file format detected.
> VIDEO:  MPEG2  720x480  (aspect 3)  29.970 fps  5726.0 kbps (715.8 kbyte/s)
> [V] filefmt:2  fourcc:0x10000002  size:720x480  fps:29.970  ftime:=0.0334
> ==========================================================================
> Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
> AUDIO: 48000 Hz, 2 ch, s16le, 192.0 kbit/12.50% (ratio: 24000->192000)
> Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3)
> ==========================================================================
> videocodec: framecopy (720x480 24bpp fourcc=10000002)
> audiocodec: framecopy (format=2000 chans=2 rate=48000 bits=16
> B/s=24000 sample-1)
> Writing header...
> ODML: Aspect information not (yet?) available or unspecified, not
> writing vprp header.
> Writing header...
> ODML: Aspect information not (yet?) available or unspecified, not
> writing vprp header.
> 
> demux_mpg: 24000/1001fps progressive NTSC content detected, switching framerate.
> Writing index...
> Writing header...
> ODML: Aspect information not (yet?) available or unspecified, not
> writing vprp header.
> 
> Video stream: 7072.976 kbit/s  (884121 B/s)  size: 159153600 bytes
> 180.013 secs  4340 frames
> 
> Audio stream:  192.000 kbit/s  (24000 B/s)  size: 4320000 bytes  180.000 secs
> 
> 
> 
> 
> So, before I start bisecting changes, is this something that SHOULD work?
> 
> 
> 
> If so, would it be more likely to be a problem with mplayer or ffmpeg?
>   Or should I just sync both to the same various points in time and
> rebuild for testing purposes?   I think that when I build mplayer and
> friends, it resyncs ffmpeg, right?  Any hints for pinning?
> 
> Any other recommended techniques for testing?
> 
> 
> Thanks,
> mrc
> _______________________________________________
> MEncoder-users mailing list
> MEncoder-users at mplayerhq.hu
> https://lists.mplayerhq.hu/mailman/listinfo/mencoder-users