23.97 fps to 29.97 fps

[mrcoolekin]

If I frameserve using DGMPGDEC when the video was 23.97 but saved the project to Honor Pulldowns. Of course the video will be interlaced. Now do I really need to do a pulldown when transcoding to any other files like avi or mp4 if all I wanted was a 29.97 fps video? I can just deinterlace the file if it was interlaced and transcode it and play it on any media player without problems right? (Considering the frameserve didn't start switching fields or anything, just a smooth frameserve).

[manono]

Hi-

I can just deinterlace the file if it was interlaced and transcode it and play it on any media player without problems right?

Not if you want it to look at all decent, you don't. Depending on how you deinterlace you'll wind up with 2 blended frames out of 5 (blend deinterlacer) or 1 duplicate frame in 5 (interpolating deinterlacer). The former will give you a pulsing, strobing playback and the latter jerky playback. If it really is film sourced, you could always apply an IVTC to make it 23.976fps, but it'll slow the encoding time when compared to making it 23.976fps from the beginning (assuming progressive encoding of the source, along with pulldown flags having been applied).

Is there any particular reason you can't either edit the D2V file or go back and make a fresh D2V with the field operation set for Forced Film in order to make it 23.976fps? Why would you want it to be 29.97fps if it's really 23.976fps?

[dphirschler]

Wait a minute! You purposely telecined progressive video so that it was interlaced only to deinterlace it? That's screwed up. Why not just leave it 23.97 progressive and double two out of five frames?

Really though, you should just encode it 23.976 progressive and set it to 3:2 pulldown on playback.


Darryl

[mrcoolekin]

^Yes, I do understand you think this is the most retarded thing to do.
@manono - I am honored that you answered my thread. I've been reading a lot about PAL - NTSC, NTSC to PAL, etc conversion for the last week to see why it's such a big deal. I was only testing out a few DVD's and couldn't figure out if it mattered if I converted a movie to any framerate and it still be able to play smoothly. I didn't see what the big deal was if it was 15fps or 30fps on a portable media player and not a DVD. So I was comparing 2 different issues. Got way too confusing for me.

Alright dephirschler, that makes 100% sense. I didn't know why I didn't think of that. Lately I've been reading about fps issues for DVD vs. portable media players. I know that some portable plays can only play 29.97 fps while a DVD has to be 23.97/29.97 compliant. I read how a lot of people wanted 23.97 to 29.97 conversions and majority of the members just told the topic starter to get a DVD player that added the frames for them. Now that I think about it...it doesn't really matter either way cause when you convert a video for a portable media player, the encoder will add the frames if needed.

Last question. DVD players can deinterlace a DVD if the source was interlaced. Now I know that PC's can't deinterlace DVD's. In that case, what's the best way to get it to progressive without resizing the video?

[manono]

DVD players can deinterlace a DVD if the source was interlaced.

If they're set for progressive scan and are outputting to a progressive display, they can.

Now I know that PC's can't deinterlace DVD's.

Sure they can. You don't see the interlacing when playing a DVD on your computer, do you? Well, you don't unless you turn off the deinterlacing filter in whatever player you use.

...what's the best way to get it to progressive without resizing the video?

If the source is already progressive with the TFF/RFF flags set, you make the D2V with the field operation set for Forced Film. If it's a movie that's been hard telecined (encoded as already telecined and interlaced), you make a D2V using Honor Pulldown Flags and apply an IVTC in the script. If it's really interlaced (shot on video, every frame interlaced), you apply a deinterlacer in the script. That's for AVI or some similar format where you might not want interlacing. If for DVD you leave it interlaced.

[mrcoolekin]

Thanks. Both of you answered my question perfectly. Have a wonderful day.