[FFmpeg-user] ac3 to mp3 converting bug

Clément Bœsch ubitux at gmail.com
Wed Jul 4 10:13:15 CEST 2012

On Tue, Jul 03, 2012 at 05:34:43PM +0200, Ingo Brückl wrote:
> Nicolas George wrote on Tue, 3 Jul 2012 13:38:00 +0200:
> > Le sextidi 16 messidor, an CCXX, Ingo Brückl a écrit :
> >> Sure. What information would you need?
> > All you can give on how to reproduce the problem.
> I'm afraid there is hardly more I can tell than I already did in my postings

What do you use for playback for instance (ffplay, MPlayer?)

Also, since you mentioned the *static* libmp3lame, is the issue
reproducible with a shared version?

Is that only reproducible with AC3 → MP3? Can you try with, let's say flac
or a libvorbis?

> or you can see from the logs. The only thing that might be unusual with my PC
> is an old CPU, AMD Athlon. Is there some assembler code that is in effect now
> and wasn't before and has some SSE1-only related issues?
> Would the output files or the statically linked ffmpeg be of any help?

It could, eventually.

> > Bissecting the history is premature, as I currently can not confirm that a
> > bug exists.
> But I can reproduce that it is this very commit that causes the problems.
> Prior to that patch, no problems, after the patch, a mute output file with
> lots of 0x55 in it.

Monster's Inc samples, as well as Broadway start with silence anyway, what
about TomorrowNeverDies-2.1-48khz-192kbit.ac3?

Like the others I can't reproduce the issue as well. It's not about not
believing the issue does not exist and doesn't come from this commit, but
more about how to reproduce the bug so we can understand what's wrong in
that particular commit (thanks for bisecting).

Clément B.
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