Opened 20 months ago

Last modified 14 months ago

#5457 new defect

mp3 delay issue

Reported by: rhbc73 Owned by:
Priority: normal Component: undetermined
Version: git-master Keywords: mp3 avi
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

This issue is reproduced with

ffmpeg version N-79546-g13406b6 Copyright (c) 2000-2016 the FFmpeg developers

Description:
Run below commands to generate a.wav and b.wav

ffmpeg.exe -i big50.mp4 -acodec libmp3lame a.mp3
ffmpeg.exe -i a.mp3 a.wav
ffmpeg.exe -i big50.mp4 -vcodec libx264 -acodec libmp3lame b.avi
ffmpeg.exe -i b.avi b.wav

Open a.wav and b.wav in wav file editor you can see there's 50 ms delay in b.wav. (sample rate is 22050, so that 50 ms should be delay introduced by LAME that are don't properly handled by ffmpeg?)

Source mp4 is here: https://dl.dropboxusercontent.com/u/89678527/big50.mp4
and generated wav files:
https://dl.dropboxusercontent.com/u/89678527/a.wav
https://dl.dropboxusercontent.com/u/89678527/b.wav

here's comparison of a.wav and b.wav
https://dl.dropboxusercontent.com/u/89678527/mp3.PNG

Change History (2)

comment:1 Changed 14 months ago by cehoyos

  • Keywords mp3 added
  • Version changed from unspecified to git-master

If there is an issue, it is still reproducible.

comment:2 Changed 14 months ago by cehoyos

  • Keywords avi added
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