On 7 Nov 2004, scott wrote:

> >     Hmm, but if you deinterlace does it matter (much) if the fields are 
> >     reversed?  You'll still get the single blended progressive frame out.
> > 
> Yes, but if the fields are in the wrong order for a particular frame,
> although it will be too quick for the eye to see exactly what happens,
> one field would be higher than it should be and the other lower.  I tiny

        Not in a progressive frame which is what a deinterlacing program
        generates ;)  In a progressive frame there is no "field order" - the
        two "upper"/"lower"/"higher"/"lower" fields have been 
blended/merged/whatever
        into a single frame.

> judder would occur, in my case every 5 frames or so.  Unless of course I
> don't understand how an interlaced stream is played back to an ordinary
> tv :-)

        I think you just missed my mention of 'deinterlacing' :)

> This is material recorded from a commercial film ->VHS PAL
> tape->VCR->S-Video connector->DC10+->lavrec (from kernel 2.6.8.1)

> Its the same clip I talked about a week or so back and is here:

        Right - ok, I'd forgotten about that.

        The recommendation as I recall was to get an image stabilizer of some
        form or a TBC to give a cleaner signal to the DC10+.  Who knows, that
        might even steady the image enough to improve the efficiency of the
        encoder.  That's what happened when I used one of the Sima units - I
        didn't have a field order problem but there was a unsteadyness to the
        picture and when that was cleaned up the bitrate dropped in the final
        encoding.

> If the CVS owners think any of this might be useful I can tidy my mods
> up (tabstops, naming conventions, etc) and submit a patch?

        We're not the nit picking ffmpeg/MPlayer group so minor style 
        differences are of no importance (I prefer tabs for example).

        Sure, tidy it up a bit and post it (mjpeg-developers would probably
        be a good place although this forum'd be OK too).

        Cheers,
        Steven Schultz



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