Capturing NTSC cartoon LD - output to DVD - jittery picture

[lchiu7]

Trying to convert some NTSC cartoon LD's to DVD so it's easier to watch. I capture the LD output (s-video) using iuvcr, 720x480 29.97fps Huffyuv compression. I can capture about 60 minutes (one side) with only about a few frames dropped which is acceptable. I then run the output avi file through tmpgenc to make a DVD compliant mpg file (using the standard DVD NTSC template). Finally author the mpg to DVD using DVD Movie Factory and burn to DVD-RW using a Sony DRU500A


Tmpgenc settings are interlace source and interlace output which I presume is right

It all works without a hitch - however the resultant DVD plays a bit jerkily on my DVD player.

Any ideas why?

Thanks

[flaninacupboard]

is your video set to top field first or bottom field first? whichever you have, try the other!

[lchiu7]

Bottom Field First but I must admit I never even thought about or know what that setting does. Will try the other though. Need to recapture the video to do that

[xxiangg]

Definitely, field order is one factor which causing jerky MPG. But I am not
sure if by changing field order will solve all the jerky problems. I found
some of my captured cartoon TV shows will resulting a jerky MPG, regardless
of which field first I choose in TMPGEnc. It seems the original film frame
rate also can result in some jerky MPG. I tried some experiments with
virtualdup using different filters to frameserve TMPGEnc, jerkiness of some
films can be greatly reduced. But it is still there compared with if it is
recorded on video tape.

I believe using correct filters in virdualdup, correct setting in TMPGEnc,
and/or interlace/deinterlace, the jerkiness will be eliminated. I tried
searching on Goggle.com and can not find what is the right combinations of
the setting for the two tools. BTW, I did some investigation of the AVI file
before encoding (using virtualdup and walk through the file frame by frame)
and had some observations for the film with the jerky results. It seems the
frame order is the cause.

The frame order of the first AVI causing jerky MPG: (captured from TV show)
1,2,3,4,5,5,6,7,8,9,10,10,...
I.e., every 5th(or 4th) frame is repeated as the 6th(or 5th) frame. In
other words, every a few frames there is a freezing frame.

The frame order of the second AVI causing jerky MPG: (captured from VHS tape)
1,3,4,2,5,6,7,8,9,11,12,10,13,...
I.e., every a few frames, there is one frame which should at least two
frames earlier shown. Because there is a scene change, it is very
obverious from a cartoon film.

My computer setup is
Intel P4 with intel chipset, on board video and on board audio, 512M,
WinTV GO card with PicVideo MJPEG Codec(trial version).

Actually, I used to capture to DV using DigitCam and had no jerky problem
if I select bottom field first. I never remember there is a frame order
issue in DV. Now I am considering to switch back to DV. It seems go to
DV is easier.

[lchiu7]

I just did a test using Top Field First. With no frame drops and then encoding to MPEG2 with tmpgenc using the standard DVD template, authoring with DVD Moviefactory and burning with Nero, there seemed to be no jerkiness. I also turned on de-interlacing in tmpgenc - not sure if that helped.

Did notice one strange artifact though. Must be my TV which has terrible overscan so the image gets truncated both vertically and horizontally. Needed to resize the image to 700x460 to take into account the overscan of the TV.

Larry

[txpharoah]

I also turned on de-interlacing in tmpgenc - not sure if that helped.

NNNNNNNOOOOOOOOO!!!!!!!!!

No, don't do that. You'll ruin the quality of your interlaced source. Merely try switching fields - that was probably your problem. Most capture cards grab from TOP A FIELD first and not the tv standard BOTTOM FIELD B. Your MPEG2 encode just needs to match the source (in your case, the captured AVI file).

[lchiu7]

Ok - did another test with only Top Field first and didn't do de-interlace. That seemed to work fine. Interestingly though when I capture a regular movie (in this case Star Wars) even with Bottom Field First I don't get the jittery picture. Any ideas?

Larry