[Ffmpeg-devel] interlace and motion artifacts

[Michael Niedermayer]

Hi

On Wed, Feb 15, 2006 at 08:29:47PM -0500, Dan Maas wrote:
> > So, I hacked myself a new command-line switch that cycles the image up
> > by one scanline. Attached. Use "-shift 1" to reverse the field
> > order. I only implented this for PIX_FMT_YUV422P but it should be
> > easy to do for other formats.
> 
> It should handle 4:1:1 as-is, you can change this:
> 
> if(enc->pix_fmt != PIX_FMT_YUV422P) {
> 
> to this:
> 
> if((enc->pix_fmt != PIX_FMT_YUV422P) && (enc->pix_fmt != PIX_FMT_YUV411P)) {
> 
> for 4:2:0, you could do a quick hack by shifting luma as in my patch,
> and just leaving chroma alone. (change the upper limit of the first
> "for" loop to "chan < 1"). Of course, to do it "right" in 4:2:0 you
> would have to implement a real multi-tap resampling filter to shift
> the chroma by one-half sample.
> 
> (footnote: I was surprised to discover that the chroma up/down
> sampling code in img_convert() uses point sampling. Are there any
> plans to implement real multi-tap filters?)

there was someone working on porting the swscaler code from mplayer ...
but apparently he lost interrest ...

[...]
-- 
Michael