[FFmpeg-devel] [PATCH] AC3 decoder CRC check

Andreas Öman andreas
Sun Sep 2 19:25:17 CEST 2007


M?ns Rullg?rd wrote:
> I reckon the decoder will notice if the frame is damaged anyway, and
> see no reason to explicitly check the CRC.

I must say i disagree here.

I've uploaded a sample to incoming/ac3-seriously-damaged recorded
from a DVB broadcast. The recording has deliberately poisoned with
transport stream packet drops to make the issue more clear.
Normally you would not have this rate of errors of course.
But remember that DVB specifies that one error per hour is acceptable,
and having these type of clicks every now and than makes listening
to TV an unpleasant experience.

Anyway, one can notice that all the clicks and blipps goes
away completely with the CRC check.

I think it's a nice (optional) feature to have.

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