[FFmpeg-trac] #4628(avcodec:new): FLAC encoder output is not decodable to a bitexact reproduction

[FFmpeg]

#4628: FLAC encoder output is not decodable to a bitexact reproduction
---------------------------------------+-----------------------------------
             Reporter:  Dockheas23     |                    Owner:
                 Type:  defect         |                   Status:  new
             Priority:  normal         |                Component:  avcodec
              Version:  git-master     |               Resolution:
             Keywords:  flac, flacenc  |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |
---------------------------------------+-----------------------------------

Comment (by Dockheas23):

 Console output (encoding):

 {{{
 $ ./ffmpeg -i trimmedchorus.wav -c flac trimmedchorus_new.flac
 ffmpeg version N-72933-gec5164a Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 5.1.0 (GCC)
   configuration: --toolchain=gcov --samples=fate-suite/ --enable-avisynth
 --enable-avresample --enable-fontconfig --enable-gnutls --enable-gpl
 --enable-libass --enable-libbluray --enable-libfreetype --enable-
 libfribidi --enable-libgsm --enable-libmodplug --enable-libmp3lame
 --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg
 --enable-libopus --enable-libpulse --enable-libschroedinger --enable-
 libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-
 libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-
 libxvid --enable-x11grab --enable-version3
   libavutil      54. 27.100 / 54. 27.100
   libavcodec     56. 41.100 / 56. 41.100
   libavformat    56. 36.100 / 56. 36.100
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 17.100 /  5. 17.100
   libavresample   2.  1.  0 /  2.  1.  0
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.100 /  1.  2.100
   libpostproc    53.  3.100 / 53.  3.100
 Guessed Channel Layout for  Input Stream #0.0 : stereo
 Input #0, wav, from 'trimmedchorus.wav':
   Metadata:
     encoder         : Lavf56.25.101
   Duration: 00:00:02.11, bitrate: 1411 kb/s
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2
 channels, s16, 1411 kb/s
 File 'trimmedchorus_new.flac' already exists. Overwrite ? [y/N] y
 Output #0, flac, to 'trimmedchorus_new.flac':
   Metadata:
     encoder         : Lavf56.36.100
     Stream #0:0: Audio: flac, 44100 Hz, stereo, s16, 128 kb/s
     Metadata:
       encoder         : Lavc56.41.100 flac
 Stream mapping:
   Stream #0:0 -> #0:0 (pcm_s16le (native) -> flac (native))
 Press [q] to stop, [?] for help
 size=     310kB time=00:00:02.11 bitrate=1203.4kbits/s
 video:0kB audio:302kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 2.676536%
 $
 }}}

 Console output (decoding):
 {{{
 $ ./ffmpeg -i trimmedchorus_new.flac -c pcm_s16le trimmedchorus_new.wav
 ffmpeg version N-72933-gec5164a Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 5.1.0 (GCC)
   configuration: --toolchain=gcov --samples=fate-suite/ --enable-avisynth
 --enable-avresample --enable-fontconfig --enable-gnutls --enable-gpl
 --enable-libass --enable-libbluray --enable-libfreetype --enable-
 libfribidi --enable-libgsm --enable-libmodplug --enable-libmp3lame
 --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg
 --enable-libopus --enable-libpulse --enable-libschroedinger --enable-
 libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-
 libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-
 libxvid --enable-x11grab --enable-version3
   libavutil      54. 27.100 / 54. 27.100
   libavcodec     56. 41.100 / 56. 41.100
   libavformat    56. 36.100 / 56. 36.100
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 17.100 /  5. 17.100
   libavresample   2.  1.  0 /  2.  1.  0
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.100 /  1.  2.100
   libpostproc    53.  3.100 / 53.  3.100
 Input #0, flac, from 'trimmedchorus_new.flac':
   Metadata:
     ENCODER         : Lavf56.36.100
   Duration: 00:00:02.11, start: 0.000000, bitrate: 1203 kb/s
     Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
 Output #0, wav, to 'trimmedchorus_new.wav':
   Metadata:
     ISFT            : Lavf56.36.100
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz,
 stereo, s16, 1411 kb/s
     Metadata:
       encoder         : Lavc56.41.100 pcm_s16le
 Stream mapping:
   Stream #0:0 -> #0:0 (flac (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 [flac @ 0x3322a60] invalid rice order: 4 blocksize 1049
 [flac @ 0x3322a60] decode_frame() failed
 size=     360kB time=00:00:02.08 bitrate=1411.5kbits/s
 video:0kB audio:360kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.021159%
 $
 }}}

 Using flac tool to test encoded file:
 {{{
 $ flac -t trimmedchorus_new.flac
 flac 1.3.1, Copyright (C) 2000-2009  Josh Coalson, 2011-2014  Xiph.Org
 Foundation
 flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and you
 are
 welcome to redistribute it under certain conditions.  Type `flac' for
 details.

 trimmedchorus_new.flac: ERROR, MD5 signature mismatch
 $
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4628#comment:1>
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