DVD2SVCD: Aspect issue / Pulldown problem

[Apaullo]

Hi all, first time here.....

I have an interesting problem. I tried to rip 2 vobs - one a film trailer (4:3), the other a small video interview (16:9 anamorphic), just for testing purposes. They were ripped with Smartripper. The film trailer is obviously 24 FPS, and the video interview is 29.97 FPS standard video.

I first wanted to see if DVD2SVCD (v1.0.7b4) could properly create the correct aspect in 1 mpg for both sources. It couldn't; the first experiment I tried 4:3 in the Conversion setting, the video interview was squeezed in from the sides, but the trailer was fine. In the second experiment, I tried the 16:9 setting - the video interview was fine, but the trailer was squeezed in from the top and bottom. Does that make sense... CAN DVD2SVCD make a single, all-correct mpg/disc image from sources with different aspect ratios?

Now for the main problem I've been having all day. There was something else strange to the look of these experiments, they were kind of "jittery". especially on my Apex AD-660 standalone. The trailer contained lots of action sequences and the high movement scenes seemed to "bounce" all over the place (low-movement scenes looked fine). I tried DVD2SVCD again, just on the film trailer vob, and this time i noticed, during the process, it invoked "Pulldown". I burnt the CDRW and it played back PERFECTLY. So I tried DVD2SVCD on the video interview vob, but during its process it would NOT invoke Pulldown.

Why? Is pulldown not supposed to happen on 29.97 FPS sources? I'm convinced that is how to take away the "jitters". The best results I got all day was selecting "Smart De-Interlace", but that still wasn't perfect (I have yet to try to mess with Smart DeInterlace options). I thought, by looking right at the program, the Pulldown was ONLY NOT invoked on PAL sources.

One more thing: "ForceFilm" in the DVD2AVI tab was set to OFF for the video interview, and ON for the trailer. When I did them first at the same time, I set it to OFF because I know standard video footage looks awful when forced down to 24 FPS.

Thanks in advance for any help. :)

[da franksta]

DON'T CROSSPOST! :mad:

[Kedirekin]

Pulldown should only be applied to film sources encoded at 23.97 fps. It puts flags into the mpeg stream that tells the player to turn the 23.97 fps encoded stream into 29.97 fps for playback. The reason it looks so good is that you can never get incorrect field order - the underlying encoded frames are progressive, and the interlaced playback created from it is always correct.

You shouldn't apply pulldown to footage that is encoded at 29.97 fps, because it is already 29.97 fps. And interlaced footage requires special care to get it to look right. For example, you should never change the vertical resolution on interlaced footage (it needs to stay 480/576 throughout). Also, you need to encode with the correct field order, and I think the CCE default is wrong about 90% of the time. Lastly, there are situations (changeing field order, for example) where the only solution available to us at the moment is to deinterlace.

BTW: incorrect field order causes one form of 'jitters'. I'll bet this is what you were seeing.

[halcyon]

Apaullo - please check your personal messages. Thanks!

-=<halcyon>=-