[FFmpeg-devel] [PATCH] mpeg2: remove idct randomisation

Michael Niedermayer michaelni
Mon Jun 21 00:23:36 CEST 2010

On Sun, Jun 20, 2010 at 11:21:28PM +0100, Mans Rullgard wrote:
> Since the beginning of time, the MPEG2 decoder has XORed the LSB of
> all block coeffs into the last one, probably to produce a random
> dithering for masking DCT mismatch errors.  This patch removes this
> randomisation.  As a side-effect, the value of block_last_index is
> now correct.

This violates the spec


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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