[FFmpeg-trac] #727(undetermined:new): Remuxing flac produces not strictly compliant files

[FFmpeg]

#727: Remuxing flac produces not strictly compliant files
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  important  |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:  flac
             Blocked By:             |               Blocking:
Reproduced by developer:  1          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 (bug 119)
 Regression since r22605 / 66061a12 (Add VorbisComment writing to FLAC
 files)
 {{{
 $ make fate-acodec-flac
 $ ./ffmpeg -i tests/data/acodec/flac.flac -acodec copy out.mka
 ffmpeg version N-35607-g5b98ea1, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Dec 10 2011 01:39:22 with gcc 4.5.3
   configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc
   libavutil    51. 31. 0 / 51. 31. 0
   libavcodec   53. 42. 0 / 53. 42. 0
   libavformat  53. 24. 0 / 53. 24. 0
   libavdevice  53.  4. 0 / 53.  4. 0
   libavfilter   2. 52. 0 /  2. 52. 0
   libswscale    2.  1. 0 /  2.  1. 0
 [flac @ 0x13a57a0] max_analyze_duration 5000000 reached at 5015510
 Input #0, flac, from 'tests/data/acodec/flac.flac':
   Duration: 00:00:06.00, bitrate: 482 kb/s
     Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
 Output #0, matroska, to 'out.mka':
   Metadata:
     encoder         : Lavf53.24.0
     Stream #0:0: Audio: flac, 44100 Hz, stereo
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 size=     347kB time=00:00:06.00 bitrate= 473.4kbits/s
 video:0kB audio:345kB global headers:0kB muxing overhead 0.617560%
 $ ./ffmpeg -i out.mka -acodec copy out.flac
 ffmpeg version N-35607-g5b98ea1, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Dec 10 2011 01:39:22 with gcc 4.5.3
   configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc
   libavutil    51. 31. 0 / 51. 31. 0
   libavcodec   53. 42. 0 / 53. 42. 0
   libavformat  53. 24. 0 / 53. 24. 0
   libavdevice  53.  4. 0 / 53.  4. 0
   libavfilter   2. 52. 0 /  2. 52. 0
   libswscale    2.  1. 0 /  2.  1. 0
 Input #0, matroska,webm, from 'out.mka':
   Metadata:
     ENCODER         : Lavf53.24.0
   Duration: 00:00:06.00, start: 0.000000, bitrate: 474 kb/s
     Stream #0:0: Audio: flac, 44100 Hz, stereo, s16 (default)
 Output #0, flac, to 'out.flac':
   Metadata:
     encoder         : Lavf53.24.0
     Stream #0:0: Audio: flac, 44100 Hz, stereo (default)
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 size=     353kB time=00:00:06.00 bitrate= 481.5kbits/s
 video:0kB audio:345kB global headers:0kB muxing overhead 2.344577%
 $ flac -d out.flac

 flac 1.2.1, Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007  Josh
 Coalson
 flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and you
 are
 welcome to redistribute it under certain conditions.  Type `flac' for
 details.

 out.flac: *** Got error code 0:FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC


 out.flac: ERROR while decoding data
           state = FLAC__STREAM_DECODER_READ_FRAME
 $ git checkout 64f6e357fdf955e67017dfd34ed06b1478b403e2

 ...

 $ ./ffmpeg -i out.mka -acodec copy outold.flac
 FFmpeg version git-64f6e35, Copyright (c) 2000-2010 the FFmpeg developers
   built on Dec 10 2011 02:00:01 with gcc 4.5.3
   configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc
   libavutil     50.12. 0 / 50.12. 0
   libavcodec    52.59. 0 / 52.59. 0
   libavformat   52.56. 0 / 52.56. 0
   libavdevice   52. 2. 0 / 52. 2. 0
   libswscale     0.10. 0 /  0.10. 0
 [matroska @ 0x10f43d0]Estimating duration from bitrate, this may be
 inaccurate
 Input #0, matroska, from 'out.mka':
   Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
     Stream #0.0: Audio: flac, 44100 Hz, 2 channels, s16
 Output #0, flac, to 'outold.flac':
   Metadata:
     encoder         : Lavf52.56.0
     Stream #0.0: Audio: flac, 44100 Hz, 2 channels
 Stream mapping:
   Stream #0.0 -> #0.0
 Press [q] to stop encoding
 size=     345kB time=10000000000.00 bitrate=   0.0kbits/s
 video:0kB audio:345kB global headers:0kB muxing overhead 0.011887%
 $ flac -d outold.flac

 flac 1.2.1, Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007  Josh
 Coalson
 flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and you
 are
 welcome to redistribute it under certain conditions.  Type `flac' for
 details.

 outold.flac: done
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/727>
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