[FFmpeg-user] ac3 to mp3 converting bug

Ingo Brückl ib at wupperonline.de
Mon Jul 2 01:37:55 CEST 2012

Carl Eugen Hoyos wrote on Sun, 1 Jul 2012 23:11:30 +0000 (UTC):

> Ingo Brückl <ib <at> wupperonline.de> writes:

>> The mp3 output file seems ok, but does contain
>> nothing but 0x55 blocks and thus is mute.

> Does converting the sample to wav or mp2 work?

Yes, both work.

> Does it only fail for 5.1 or also for stereo samples?
> Is a specific 5.1 sample needed?

It fails with all ac3 samples, 5.1, 2.1, 2.0 (monsters_inc_2.0_192.ac3,
all samples from http://samples.mplayerhq.hu/A-codecs/AC3/).

With TomorrowNeverDies-2.1-48khz-192kbit.ac3, but only with this one,
I even get some errors:

  [ac3 @ 0x9d0e620] frame sync error
  Error while decoding stream #0:0: Operation not permitted
  [ac3 @ 0x9d0e620] frame CRC mismatch

There are no error messages with the other samples.


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