On Sun, 2004-11-07 at 04:39, Steven M. Schultz wrote: > > > The other thing which may make life simpler is to deinterlace the > > > material with 'yuvdeinterlace'. Deinterlaced supersampled (to 4:4:4) > > > > > Yes, it would be easier except that every 5 frames or so the field order > > is incorrect and needs to be swapped. I'll have a look at y4mscaler -S > > mode=LINESWITCH so see if I can make it only line switch on a function I > > have. > > 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 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 :-) > What kind of capture process produces such a weird "jitter" or > field reversal? That sounds very strange.
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: http://www.scottwaye.com/lstest.avi >From other responses it appears the vertical shaking is due to the VCR "playing fast and loose" with the vsync signal. What introduces the field swap I don't know, but I 've put a patch in yuvcorrect (mode=DETERMINISTIC_LINE_SWITCH) which fixes that problem. With the modifications to y4mshift and yuvcorrect the pipeline looks like this: lav2yuv /downloads/lstest.avi | .libs/yuvcorrect -T DETERMINISTIC_LINE_SWITCH | y4mscaler -O chromass=444 | .libs/y4mshift -s 2 -p 430 | y4mscaler -O chromass=420_mpeg2 | yuv2lav -o ~/video/a.avi This converts the above avi to this: http://www.scottwaye.com/corrected.avi Which I think I am quite happy with. 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? ------------------------------------------------------- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
