[FFmpeg-user] ac3 to mp3 converting bug

Nicolas George nicolas.george at normalesup.org
Tue Jul 3 09:49:41 CEST 2012

Le quintidi 15 messidor, an CCXX, Ingo Brückl a écrit :
> I use to convert ac3 (dolby) audio files using ffmpeg linked with a static
> version of lame to mp3 which was working fine so far. Since recently this
> doesn't work any longer. The mp3 output file seems ok, but does contain
> nothing but 0x55 blocks and thus is mute. A conversion from an other format
> (like wav) to mp3 works fine, so it can't be lame.

> $ ffmpeg -i Broadway-5.1-48khz-448kbit.ac3 -acodec libmp3lame -ab 128k -ac 2 test.mp3 2> log1

I can see no problem with that exact command line and a fresh build. The
output MP3 starts with 3+ seconds of silence, but so does the input AC3

Can you be more precise about your test protocol and build environment?


  Nicolas George
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