Converting NTSC prog scan DVD video to NTSC prog scan DVD film....

[leonid_makarovsky]

Hello there,

I'm not sure what forum to post this. I have a couple of commercial DVDs which were originally supposed to be a progressive scan DVD films (i.e. 24fps). However, the DVDs came out as a prog scan NTSC video where every 5th frame repeats the 4th frame. Why? I don't know. But what I want to do is to rip the DVD into mpeg2 file on my harddrive, then remove every 5th frame from the mpeg 2, then set up frame rate to 23.796fps and then re-author the DVD. Is this possible to do without recompression? If so, how? What are the steps? Thank you.

--Leonid

[Guest]

Can you post a link to a small unprocessed piece of the VOB that contains the duplicates so that we may verify your diagnosis? I ask because it's possible that you have erred in your analysis and since you didn't tell us what tools and process you used to arrive at that conclusion, I'd like to have a look at the source material to properly advise you.

[Blue_MiSfit]

Indeed! This may be fixable, depending on your source. Let's have a look-see!

~MiSfit

[Inventive Software]

Why not just apply Telecine?

[leonid_makarovsky]

Can you post a link to a small unprocessed piece of the VOB that contains the duplicates so that we may verify your diagnosis? I ask because it's possible that you have erred in your analysis and since you didn't tell us what tools and process you used to arrive at that conclusion, I'd like to have a look at the source material to properly advise you.

Do you want just an 18 frame long mpeg file? Or I can snapshot 5 frames in a row from either VirtualDubMod or from PowerDVD and place it on a website.

I noticed it with the remote control on my DVD player. It is a pattern and I do have a good eye. The video is progressive.

What I was thinking is to just remove every 5th frame from the whole movie. In case 5th frame happens to be an I frame, I'd just remove the 4th frame instead. But I would like to do it without recompression. Is it possible?

--Leonid

[Guest]

I want a 25-50MByte piece of the VOB, ideally.

[leonid_makarovsky]

I'll try to post it by the end of this week. Thank you.

--Leonid

[leonid_makarovsky]

Sorry for the delay.

Here they are:
http://us.geocities.com/leonid_makarovsky/Temp/PALSource.mpg
http://us.geocities.com/leonid_makarovsky/Temp/NTSCSource.mpg

It looks like 3 frames are progressive and 2 frames are interlaced. So can something be done?

Thank you.

--Leonid

[manono]

It's a good thing neuron2 asked for a sample as your initial diagnosis was dead wrong. What you saw on your TV set was the result of a lousy flag reading DVD player deinterlacing the video.

What you have with both samples is hard telecine - the already telecined video encoded as interlaced 29.97fps. It can be made progressive again with a simple IVTC such as that provided by the AviSynth filters Decomb or TIVTC. Doing that will require a reencode of the video.

Or you could buy yourself a better cadence reading DVD player.

[leonid_makarovsky]

Thanks!

So there is no way I can do it without re-encoding, right? I have Philips 642 DVD player.

[manono]

I have Philips 642 DVD player.
Hehe, it figures. You get what you pay for. No, if you want to make it progressive again it'll require a full reencode.

Here's a review of your player:

http://www.hometheaterhifi.com/cgi-bin/shootout.cgi?function=search&articles=all#PhilipsDVP-642

Showing your hard telecined movie with 4 unique frames followed by a duplicate frame results from it failing the 3-2 Cadence, Video Flags test. Rather than performing an on-the-fly IVTC as many better players can, it deinterlaces the whole thing. Very bad. That player is hardly unique in that respect, but you can find many better ones in the full review list:

http://www.hometheaterhifi.com/cgi-bin/shootout.cgi?function=search&articles=all