Ubuntu
ffmpeg package

  1. Bug #1947686
  2. Comment #2

Comment 2 for bug 1947686

Revision history for this message
Mikko Rantalainen (mira) wrote : Re: ffmpeg parses AAC+MP4 incorrectly in Ubuntu 20.04 LTS

Example file with length of about 8.4 with me speaking numbers 1..10 in Finnish with some background noise. This has been recorded by Apple Safari on iOS 15.0.1 using the MediaRecorder API in HTML5 document.

To reproduce the problem, try this:

$ time ffmpeg -i iPad-15.0.1-MediaRecorder-audio.mp4 -acodec libmp3lame -ac 2 -qscale:a 9 -ar 48000 -joint_stereo 1 out.mp3

It should result in file called out.mp3 with a length of about 8.4 seconds. With the ffmpeg version in Ubuntu 20.04 LTS the output length is only 1 second.

The ffmpeg version distributed with Ubuntu 18.04 LTS and the snap version distributed with Ubuntu 20.04 LTS do work correctly so this bug is strictly about the version distributed via apt on Ubuntu 20.04 LTS.