[FFmpeg-user] ac3 to mp3 converting bug

Ingo Brückl ib at wupperonline.de
Thu Jul 5 11:44:33 CEST 2012

Clément Boesch wrote on Wed, 4 Jul 2012 20:19:59 +0200:

> Can you run a valgrind before & after the -af patch? It might give more
> information.

I haven't used valgrind before, but it actually seems to hint to the problem:

  vex x86->IR: unhandled instruction bytes: 0x66 0xF 0x61 0xC2
  ==16881== valgrind: Unrecognised instruction at address 0x8791031.
  ==16881==    at 0x8791031: ??? (audio_convert.asm:387)

And, indeed, after compiling ffmpeg with --disable-yasm everything is fine

On Tue, 03 Jul 2012 17:34:43 I've asked:

> Is there some assembler code that is in effect now and wasn't before and
> has some SSE1-only related issues?

It seems that something like that might be the case with my AMD Athlon XP.

Is that enough information to fix the bug or shall I provide further


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