Interlaced Video

[ShadowDweller]

I was wondering about something. On the Dude, Where's My Car DVD there is a great music video that I want to keep to re-author it to a DVD-R. I used RobShot's tweaked two pass method on the Dude, Where's My Car movie and I think the results are great. The only problem with the music video is that it is NTSC interlaced. I load the music video .vob into DVD2AVI but from there I am unsure if I should Force Film it or just leave it as is. I was reading the message board about the CCE configurations for the interlaced video and I am now confused because people are saying different things.. I tried to IVTC it manually and it was working but there were some frames that I couldn't tell if they were interlaced or not so I just stopped that.. I do not want to make load pseudo avi into virtual dub and deinterlace it because of the quality loss. I was wondering do I really have to deinterlace it if I plan on putting it back onto a DVD. I am quite confused now. I have authored a few other DVD's but nothing with interlaced NTSC... Please help me out

[wmansir]

With MPEG-2 your in luck, you can leave it as interlaced film (ie. don't use Force Film or IVTC) and encode it as is. Of course playback on your PC will not look so hot, but it will look fine on a TV set.

[Taric25]

Doom9 has a guide on this.

http://www.doom9.org/mpg/tmpg-ivtc.htm

You should do as this guide says. I used it for a DVD of mine that was interlaced. It looks MUCH better now on a progressive scan TV. Don't worry about those few frames that are still interlaced.

[ShadowDweller]

I encoded the video without force filming it and I played it on my DVD standalone and it played fine. I didn't IVTC it either... real nice

[Friday]

It may look fine but your encoded video stream is different then what was originally on the dvd. The fields will be in different order. Somewhere in the chain while being fed to CCE they go wrong.

You can, as I have, do tests in Tmpeg to confirm this.

The way to set up the test is as follows:

1)Make an avi of your encoded mpeg2 file

Encode a vob of your interlaced material...rip it at 29.97 and do not check progressive frames in CCE.

You now have an mpv file which you can bring back into dvd2avi and make a d2v file. convert to vpapi and bring into tmpeg ivtc window.

2)Make an avi of the original vob

I'll assume you know how to do this. Again select "none" for field operation in dvd2avi. Bring this avi into a second session of Tmpeg
ivtc window...the only application I know that displays individual fields.

Now...take a look. You have got 2 different streams and the original is right so the encoded is...umm..well..it is wrong..plain and simple.

I have more comments which I will reserve until I get a reply from you.

For a look at one of my tests copy and paste the link. The original is on the left and the encoded is on the right.

By the way...I loved that video too...it was "Stoopid Ass"...right?

www.geocities.com/zeno117/hollywood/field_order.jpg

[ShadowDweller]

thanks for replying to me... I didn't try the method you told me to do because I just decoded the Stoopid Ass video at 29.976fps and made it into an m2v that way... works nice.. It plays fine on my computer too.. I just have to burn it to a cd... so, tell me more about the method you started posting before...

[ShadowDweller]

Alright, I just burned the video to a cd and played it on my standalone and it looked really bad... so, could you please reply to me and let me know a method that works great. All I want to do is downsample the original video and then put it back onto a dvd with Dude, Where's My Car

[Friday]

What i do when making svcds from true interlaced sources is first see if i can just use the original mpv stream intact. I have an Apex standalone which supports 720 480 resolution and data rates up to 4900. So I analyse the video stream in bitrate viewer. if the average and peak data values fall below 4900 then i just use the orinal stream. Most adult dvds don't use high data rates, so this method often works. Most of the time the data rate is between 3 and 4.5 and this allows me between 20 to 27 minutes of dvd video on a cd.

This is by far the best way but you may not have the equipment or you may have video with a higher data rate.

If this is the case then you must transcode. I would then check to see if i had a truly interlaced source and if possible perform IVTC. Often effective IVTC is not possible but, always check, you may be pleasntly surprised sometimes even truly interlaced source can be ivtced sometimes.

But , sadly most of the time it is hopelessly interlaced and some of the best examples of this are music videos with all the transitions.

For these types and to stay away from deinterlacing the program of choice is ReMpeg. ReMpeg is the only transcoder that i know of which preserves field order.

The most important option you have in this proggy is "match source".

Before i go on, why don't you familarize yourself with the program and then you can ask specific questions.

EDIT. I just very carefully read your last reply. Are you burning to a dvd or a cd?

[ShadowDweller]

I was testing the music video out on a normal cd but I am going to put it on a dvd.. I used rempeg to match source and when I imported it into my dvd authoring program you saw the interlaced frames. I am going to burn the mpg to a dvd when I get a dvd-r and see what happens then.. thanks for recommending rempeg. I think this is a very good mpeg encoder... Is there any specific settings I should check out what that program to make dvd quality mpeg's so that I can reburn them to dvd's without any quality loss?

[Friday]

If you're gonna use a dvd...why re-encode?

But now...this should go in the mini dvd section and also there is an excellent thread somewhere in theis forum on how to get a dual layered dvd to a single layered dvd using rempeg. If I find it I will let you know.

[ShadowDweller]

I rented dude where's my car and on that dvd they have an awesome music video that I also want to keep. So, if I re-author the dvd I can have both the movie and the music video "stoopid ass." All I want to do is to re-author the movie and the music video without any quality loss. When I used Robshot's method I noticed in complex scenes that there are motion blocks there :( I mean I will try to encode the movie at a higher bitrate but I was wondering if there is a better encoder than CCE??

[agzz]

why do you want to reencode. isnt it possible to fix that without reencode. ie ifoEdit?

[Friday]

I can now report that the Rempeg method does not always work. I just did a true interlaced movie trailer and it did not play correctly on my standalone.

So after you transcode...it would be adviseable to test the clip on a rewritable disc.