Opened 11 years ago

Closed 10 years ago

#3599 closed defect (invalid)

mp3 encoder set wrong bitrate or version flag

Reported by: croex Owned by:
Priority: normal Component: avformat
Version: git-master Keywords: mp3
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

when i convert a audio to mp3, and detect it by command[file], it return wrong bitrate info.

% ffmpeg -i input.mp3 -b:a 32k -c:a libmp3lame output.mp3
ffmpeg version
10769 ~/av » ffmpeg
ffmpeg version 2.1.3 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan 17 2014 09:39:01 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --arch=x86_64 --enable-runtime-cpudetect
  libavutil      52. 48.101 / 52. 48.101
  libavcodec     55. 39.101 / 55. 39.101
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100

% file output.mp3
output.mp3: Audio file with ID3 version 2.4.0, contains: MPEG ADTS, layer III, v2,  56 kbps, 22.05 kHz, Stereo

command [file] detect mp3 by its frame header according to ​http://mpgedit.org/mpgedit/mpeg_format/MP3Format.html.

is it possible ffmpeg set the wrong frame header or other reasons?

Change History (7)

comment:1 by croex, 11 years ago

bitrate detected by [file] aways higher than expected, maybe it is not a bug, but i can't determine it.
the sample input file： ​http://ztest.qiniudn.com/432859.mp3

comment:2 by Carl Eugen Hoyos, 11 years ago

Please add the complete, uncut console output to make this a valid ticket.

comment:3 by croex, 11 years ago 

10782 ~/av » ffmpeg -i 432859.mp3 -b:a 32k -c:a libmp3lame -y output.mp3
ffmpeg version 2.1.3 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan 17 2014 09:39:01 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --arch=x86_64 --enable-runtime-cpudetect
  libavutil      52. 48.101 / 52. 48.101
  libavcodec     55. 39.101 / 55. 39.101
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
[mp3 @ 0x7fbd40818200] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from '432859.mp3':
  Metadata:
    title           : 002
    artist          : ���������� www.5tps.com
    album           : ���������� www.5tps.com
    comment         : ���������� www.5tps.com
  Duration: 00:21:19.08, start: 0.000000, bitrate: 32 kb/s
    Stream #0:0: Audio: mp3, 22050 Hz, stereo, s16p, 32 kb/s
Output #0, mp3, to 'output.mp3':
  Metadata:
    TIT2            : 002
    TPE1            : ���������� www.5tps.com
    TALB            : ���������� www.5tps.com
    comment         : ���������� www.5tps.com
    TSSE            : Lavf55.19.104
    Stream #0:0: Audio: mp3 (libmp3lame), 22050 Hz, stereo, s16p, 32 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mp3 -> libmp3lame)
Press [q] to stop, [?] for help
[mp3 @ 0x7fbd40820800] Header missingate=  32.0kbits/s
Error while decoding stream #0:0: Invalid data found when processing input
size=    4996kB time=00:21:18.95 bitrate=  32.0kbits/s
video:0kB audio:4996kB subtitle:0 global headers:0kB muxing overhead 0.006939%
10783 ~/av » file output.mp3
output.mp3: Audio file with ID3 version 2.4.0, contains: MPEG ADTS, layer III, v2,  56 kbps, 22.05 kHz, Stereo

the complete, uncut console

comment:4 by Carl Eugen Hoyos, 11 years ago

Component: undetermined → avformat
Keywords: mp3 added
Version: unspecified → git-master

I suspect file does not support xing headers, use -write_xing 0 as a workaround.

in reply to:  4 ; comment:5 by croex, 11 years ago

Replying to cehoyos:

I suspect file does not support xing headers, use -write_xing 0 as a workaround.

I found the bug was fixed, tks :)
​http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=617a1a98a6be3e59db6fbfc21afab2fb9a049c03;hp=254c95cdd1b669a722204a4a65974fc2523c8f83

Last edited 11 years ago by croex (previous) (diff)

in reply to:  5 comment:6 by Carl Eugen Hoyos, 11 years ago

Replying to ltzliwe:

Replying to cehoyos:

I suspect file does not support xing headers, use -write_xing 0 as a workaround.

I found the bug was fixed, tks :)
​http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=617a1a98a6be3e59db6fbfc21afab2fb9a049c03;hp=254c95cdd1b669a722204a4a65974fc2523c8f83

This commit was already part of 2.1.3 so I don't think it could have fixed your issue.
Additionally, I can also reproduce it here with (current FFmpeg git head and) file-5.11.

$ffmpeg -i fate-suite/svq3/Vertical400kbit.sorenson3.mov -vn -ab 32k -map_metadata -1 out.mp3
ffmpeg version N-62951-g3316556 Copyright (c) 2000-2014 the FFmpeg developers
  built on May  4 2014 09:03:53 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --enable-libvorbis --enable-libvpx --enable-libmp3lame
  libavutil      52. 81.100 / 52. 81.100
  libavcodec     55. 60.103 / 55. 60.103
  libavformat    55. 37.102 / 55. 37.102
  libavdevice    55. 13.101 / 55. 13.101
  libavfilter     4.  5.100 /  4.  5.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Guessed Channel Layout for  Input Stream #0.1 : mono
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'fate-suite/svq3/Vertical400kbit.sorenson3.mov':
  Metadata:
    creation_time   : 2001-03-20 16:17:18
    title           : Vertical Online SV3 Demo
    title-eng       : Vertical Online SV3 Demo
    artist          : Logan Kelsey
    artist-eng      : Logan Kelsey
    copyright       : © Vertical Online 2001
    copyright-eng   : © Vertical Online 2001
    encoder         : Sorenson Video 3
    encoder-eng     : Sorenson Video 3
  Duration: 00:00:43.58, start: 0.000000, bitrate: 580 kb/s
    Stream #0:0(eng): Video: svq3 (SVQ3 / 0x33515653), yuvj420p(pc), 320x240, 391 kb/s, 30.02 fps, 30 tbr, 600 tbn, 600 tbc (default)
    Metadata:
      creation_time   : 2001-03-20 16:17:18
      handler_name    : Apple Alias Data Handler
      encoder         : Sorenson Video 3
    Stream #0:1(eng): Audio: adpcm_ima_qt (ima4 / 0x34616D69), 44100 Hz, mono, s16p, 176 kb/s (default)
    Metadata:
      creation_time   : 2001-03-20 16:17:18
      handler_name    : Apple Alias Data Handler
Output #0, mp3, to 'out.mp3':
  Metadata:
    TSSE            : Lavf55.37.102
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, mono, s16p, 32 kb/s (default)
Stream mapping:
  Stream #0:1 -> #0:0 (adpcm_ima_qt -> libmp3lame)
Press [q] to stop, [?] for help
Multiple frames in a packet from stream 1
size=     171kB time=00:00:43.59 bitrate=  32.1kbits/s
video:0kB audio:170kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.130087%

$ file out.mp3
out.mp3: Audio file with ID3 version 2.4.0, contains: MPEG ADTS, layer III, v1,  56 kbps, 44.1 kHz, Monaural

$ ffmpeg -i out.mp3
ffmpeg version N-62951-g3316556 Copyright (c) 2000-2014 the FFmpeg developers
  built on May  4 2014 09:03:53 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --enable-libvorbis --enable-libvpx --enable-libmp3lame
  libavutil      52. 81.100 / 52. 81.100
  libavcodec     55. 60.103 / 55. 60.103
  libavformat    55. 37.102 / 55. 37.102
  libavdevice    55. 13.101 / 55. 13.101
  libavfilter     4.  5.100 /  4.  5.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mp3, from 'out.mp3':
  Metadata:
    encoder         : Lavf55.37.102
  Duration: 00:00:43.62, start: 0.025057, bitrate: 32 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, mono, s16p, 32 kb/s
At least one output file must be specified

Works fine if no XING header is written:

$ ffmpeg -i fate-suite/svq3/Vertical400kbit.sorenson3.mov -write_xing 0 -ab 32k outnoxing.mp3
ffmpeg version N-62951-g3316556 Copyright (c) 2000-2014 the FFmpeg developers
  built on May  4 2014 09:03:53 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --enable-libvorbis --enable-libvpx --enable-libmp3lame
  libavutil      52. 81.100 / 52. 81.100
  libavcodec     55. 60.103 / 55. 60.103
  libavformat    55. 37.102 / 55. 37.102
  libavdevice    55. 13.101 / 55. 13.101
  libavfilter     4.  5.100 /  4.  5.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Guessed Channel Layout for  Input Stream #0.1 : mono
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'fate-suite/svq3/Vertical400kbit.sorenson3.mov':
  Metadata:
    creation_time   : 2001-03-20 16:17:18
    title           : Vertical Online SV3 Demo
    title-eng       : Vertical Online SV3 Demo
    artist          : Logan Kelsey
    artist-eng      : Logan Kelsey
    copyright       : © Vertical Online 2001
    copyright-eng   : © Vertical Online 2001
    encoder         : Sorenson Video 3
    encoder-eng     : Sorenson Video 3
  Duration: 00:00:43.58, start: 0.000000, bitrate: 580 kb/s
    Stream #0:0(eng): Video: svq3 (SVQ3 / 0x33515653), yuvj420p(pc), 320x240, 391 kb/s, 30.02 fps, 30 tbr, 600 tbn, 600 tbc (default)
    Metadata:
      creation_time   : 2001-03-20 16:17:18
      handler_name    : Apple Alias Data Handler
      encoder         : Sorenson Video 3
    Stream #0:1(eng): Audio: adpcm_ima_qt (ima4 / 0x34616D69), 44100 Hz, mono, s16p, 176 kb/s (default)
    Metadata:
      creation_time   : 2001-03-20 16:17:18
      handler_name    : Apple Alias Data Handler
Output #0, mp3, to 'outnoxing.mp3':
  Metadata:
    encoder-eng     : Sorenson Video 3
    TIT2            : Vertical Online SV3 Demo
    title-eng       : Vertical Online SV3 Demo
    TPE1            : Logan Kelsey
    artist-eng      : Logan Kelsey
    TCOP            : © Vertical Online 2001
    copyright-eng   : © Vertical Online 2001
    TSSE            : Lavf55.37.102
    Stream #0:0(eng): Audio: mp3 (libmp3lame), 44100 Hz, mono, s16p, 32 kb/s (default)
    Metadata:
      creation_time   : 2001-03-20 16:17:18
      handler_name    : Apple Alias Data Handler
Stream mapping:
  Stream #0:1 -> #0:0 (adpcm_ima_qt -> libmp3lame)
Press [q] to stop, [?] for help
Multiple frames in a packet from stream 1
size=     171kB time=00:00:43.59 bitrate=  32.1kbits/s
video:0kB audio:170kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.177652%

$ file outnoxing.mp3
outnoxing.mp3: Audio file with ID3 version 2.4.0, contains: MPEG ADTS, layer III, v1,  32 kbps, 44.1 kHz, Monaural

comment:7 by Michael Niedermayer, 10 years ago

Resolution: → invalid
Status: new → closed

Well, the xing header needs some space and so the lower bitrates either cannot contain it or the first packet has a higher bitrate.
I dont see how this could be fixed but if someone has an idea dont hesitate to explain how and reopen the ticket

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