Opened 5 years ago

Closed 5 years ago

#3884 closed defect (fixed)

Decoding specific MP3 file produces broken sound at the beginning if "-ss 0" is applied

Reported by: vilic Owned by:
Priority: important Component: avformat
Version: git-master Keywords: mp3 regression
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no

Description

Summary of the bug:
How to reproduce:

% ffmpeg -y -ss 0 -i input.mp3 -codec:a libmp3lame -qscale:a 8 output.mp3
ffmpeg version N-65810-g1b5ec6a
built on Aug 22 2014 00:27:20 with gcc 4.8.3 (GCC)

Found only one specific mp3 file would cause this issue, and only when -ss is set to 0. I tried -ss 0.01 and it worked fine.

Attachments (1)

input.mp3 (18.4 KB) - added by vilic 5 years ago.

Download all attachments as: .zip

Change History (3)

Changed 5 years ago by vilic

comment:1 Changed 5 years ago by cehoyos

  • Analyzed by developer unset
  • Component changed from undetermined to avformat
  • Keywords mp3 regression added
  • Status changed from new to open
  • Summary changed from Trimming specific MP3 file produces broken sound at the beginning if "-ss 0" is applied to Decoding specific MP3 file produces broken sound at the beginning if "-ss 0" is applied
  • Version changed from unspecified to git-master

For future tickets: Please always add the complete, uncut console output and please use internal encoders if they allow to reproduce the issue.

Regression since 7546ac2f

$ ffmpeg -ss 0 -i input.mp3 out.wav
ffmpeg version N-65810-g1b5ec6a Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug 22 2014 12:18:11 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      54.  6.100 / 54.  6.100
  libavcodec     56.  0.101 / 56.  0.101
  libavformat    56.  1.100 / 56.  1.100
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  0.102 /  5.  0.102
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, mp3, from 'input.mp3':
  Duration: 00:00:01.15, start: 0.025057, bitrate: 130 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, mono, s16p, 128 kb/s
    Metadata:
      encoder         : LAME3.99r
    Side data:
      replaygain: track gain - -7.400000, track peak - unknown, album gain - unknown, album peak - unknown,
Output #0, wav, to 'out.wav':
  Metadata:
    ISFT            : Lavf56.1.100
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s
    Metadata:
      encoder         : Lavc56.0.101 pcm_s16le
Stream mapping:
  Stream #0:0 -> #0:0 (mp3 (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Input stream #0:0 frame changed from rate:44100 fmt:s16p ch:1 chl:mono to rate:44100 fmt:s16p ch:2 chl:stereo
Input stream #0:0 frame changed from rate:44100 fmt:s16p ch:2 chl:stereo to rate:44100 fmt:s16p ch:1 chl:mono
size=      98kB time=00:00:01.14 bitrate= 695.5kbits/s
video:0kB audio:98kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.078125%

comment:2 Changed 5 years ago by michael

  • Resolution set to fixed
  • Status changed from open to closed
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