[MPlayer-users] Scaling interlaced video for DVD playback

[Fabio Papa]

On Friday 14 November 2003 21:40, D Richard Felker III wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>
> On Fri, Nov 14, 2003 at 08:10:10AM +0100, Fabio Papa wrote:
> > [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > Hi list,
> > it has been some days now that I'm trying to find the optimal way tho
> > handle interlaced video I capture from a bt 8x8 card.
> > I used to deinterlace contents, but I was never happy with the results.
> > Then I got inspired from some of D Richard Felker III words and I started
> > to find a way to scale my videos (which is a need for me) while retaining
> > them interlaced. I finally come up with the idea that the most correct
> > video filter chain is something like:
> > -vf il=d:d,scale=xxx:yyy,il=i:i
> > The resulting video is still interlaced, but with more thick lines, which
> > I think is ok given the rescale operation.
> > Now, if I convert this to mpeg1 with mencoder, and use it to master some
> > test DVDs, I see the interlaced artifacts even on tv. It seems my dvd
> > player or tv set is not displaying it properly.
>
> No, you made the video wrong. As far as DVD/[S]VCD is concerned, there
> is no such thing as 352x240 (or 352x288) interlaced video. Even if it
> were possible, it would look extremely bad. Either make full 480-line
> (or 576-line for PAL) DVDs, or else deinterlace and make low-res ones.
>
> > How would one solve that? And, more in general, what's the correct
> > procedure to handle such interlaced files for later TV only view?
>
> The correct way is to keep the full resolution. The only reason to
> ever scale interlaced video is if you're going to be playing it
> smaller. One good example is the effect news shows do, where they
> scale down two tv pictures and put them in small 'windows' on the
> screen.

Ok, understood. Now a new problem arise: how do I do a lossless capture from 
my TV card at such resolution? ffv1 is much cpu consuming and huffyuv will 
fill my HD up. Is there some other possibilities?

>
> Rich
>
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-- 
Fabio Papa
Engineering division
Machining Centers Manufacturing S.p.A.
viale F. e G. Celaschi 19 - Vigolzone (PC) Italy