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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