[FFmpeg-devel] pixel format convertion yuv422p->yuv420p->yuv411p->yuv422p degrade picture
Tue Jul 15 19:26:59 CEST 2008
On Tue, Jul 15, 2008 at 05:44:10PM +0100, M?ns Rullg?rd wrote:
> Maksym Veremeyenko wrote:
> > Michael Niedermayer ???????(??):
> >> On Tue, Jul 15, 2008 at 04:22:33PM +0100, M?ns Rullg?rd wrote:
> > 50 iterations was only for proving that convertions degrade picture...
> > So, as conclusion, that a normal?
> The conclusion is that it's probably not worthwhile doing anything about
> it. It would make the code slower with no real benefit in practical use
It should be possible to add some ordered dither in some of the SIMD
converters with no speed effect. Our RGB15/16 output already applies dither
as it does make a vissible difference.
In C it could be done by unrolling the code, but yes i agree it has no
practical benefit for 24bit->24bit. Then again if someone wants it and
theres no speed loss and its cleanly implementd ...
iam not opposed to reviewing and applying a patch to swscale.
That btw leads to the question if the greeniness is from swscale or the
old converter? And if SWS_ACCURATE_RND was used?
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
I know you won't believe me, but the highest form of Human Excellence is
to question oneself and others. -- Socrates
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