[FFmpeg-devel] [PATCH] Make MMX2 put_no_rnd_pixels _x2 and _y2 bitexact

[Reimar Döffinger]

On Sat, May 29, 2010 at 08:18:50PM +0200, Stefan Gehrer wrote:
> On 05/29/2010 12:49 AM, David Conrad wrote:
> >On May 28, 2010, at 6:34 PM, Stefan Gehrer wrote:
> >>On 05/29/2010 12:27 AM, David Conrad wrote:
> >>>On May 28, 2010, at 6:25 PM, Stefan Gehrer wrote:
> >>>>On 05/28/2010 11:49 PM, David Conrad wrote:
> >>>The problem is that theora must always be bitexact,
> >>
> >>Why is that? If I don't see the difference I would think
> >>I can decode it with deviation.
> >
> >Same reason H.264 must be: it's part of the spec.
> 
> That doesn't count as an argument. Some people write
> decoders without having seen any spec :)

I'm also fairly certain that for H.264 the reason is that
there are real-world cases where you will get (easily)
visible artefacts otherwise.
No idea if that can happen for Theora.