[MPlayer-users] Re: Bttv and YV12

[Levente Novák]

On Sat, 2007-02-17 at 19:26 +0100, Tobias Diedrich wrote:
> Levente Novák wrote:
> > After searching a while on the net, I am quite confused now: is YV12
> > capture still broken (YUV 4:2:0 chroma interlacing bug) with bttv or
> > not? If yes, is there a patch to bttv which is able to correct this
> > misbehaviour?
> 
> There is a hardware limitation, for YV12 bttv has to skip chroma
> lines, so even if the chroma interlacing were fixed (don't know
> about that one), you'd still get better results with capturing YUY2
> and downsampling it to YV12 using the software scaler...

Yes, this would be the best indeed, but it is considerably slower
(scaling is very CPU-intensive). For recording on-the-fly, capture in
YV12 would minimise framedropping (anyway, all MPEG-based codecs work in
4:2:0 colorspace).