Whats the proper way to deinterlace

[paulers]

can someone help me deinterlace this movie? What is the recommended method? Do I use a decomb filter? Do I force film? Im lost.

Thanks :)

[slk001]

The BEST way is to use FORCE FILM in the FIELD OPERATION window in DVD2AVI (IF a preview shows 95%+ FILM content). However, some videos are hybrids and have both FILM parts and INTERLACED parts. The hybrids are, as you might think, much harder to deal with correctly (each part has to be separated out and dealt with individually).

If you have a true INTERLACED video, then filters such as IVTC2.2 and DECOMB (telecide and decimate) have worked for me. Others include GreedyHMA, but I haven't use this yet.

Hybrids most generally result from DVD releases of old TV shows that combine real parts with CGI parts (Star Trek: TNG is one that I have heard is hybrid). I would say that 99.9% of all videos that were originally theatrical releases would be of the FILM type and easily IVTC'ed by DVD2AVI's FORCE FILM option.

As a last resort, you could run DVD2AVI with NONE in the FIELD OPERATION, encode as NON-PROGRESSIVE and burn it as INTERLACED. You probably can not tell the difference on a TV.

[paulers]

Thanks for the response. I will try telecide with decomb. With decimate do I have to use pulldown.exe to add the frames that decimate removes? or am I confused.

[slk001]

With DECIMATE you have to use PULLDOWN. However, PULLDOWN doesn't "add" any extra frames (the size of a video after PULLDOWN will NOT change)... it just adds the proper flags so that your player will display the video at the proper frame rate.

[RB]

I'm in PAL land so I might be missing something but ... why deinterlace at all? What do you gain from it? Software DVD players all have deinterlacing options by itself (sometimes even hardware assisted, for instance ATI cards provide a hardware BOB for the overlay) and for standalone players keeping it interlaced will provide the best quality anyway. Am I missing something?

[auenf]

mpeg-2 supports interlaced video, but it still compresses progressive video a hell of a lot better.

Enf...

[RB]

Originally posted by auenf
mpeg-2 supports interlaced video, but it still compresses progressive video a hell of a lot better.


Hmm, could it also depend on the source?

I just performed a small test using 30 seconds of interlaced PAL material (fullscreen 4:3). I used "SmartDeinterlace" and "Keep Interlaced" in D2S and CCE 2.50. The resulting video files were almost exactly of the same size (about 10 MB). Ideas?

[tyee]

I have a question regarding home shot DV and deinterlacing.

I have read on this forum (especially by mb1) that deinterlacing DV is not recommended. However I am not happy with viewing my finished interlaced DVD project on my computer monitor since monitors are progressive devices. I also have a dlp projector which is also effectively a big progressive monitor. So I want the best of both worlds. What we are doing with DVDs and DVD2AVI, maybe I can do with DV.

This is what I want to do. Please verify if you think it will work.

1. I save my 29.97fps interlaced DV project in my editing application as progressive (it has this feature from what I remember, or I'll just deinterlace it with decomb).

2. Encode to mpeg2 with CCE, then run 'pulldown' on this mpeg2 file.

Now if this was a DVD, the DVD would play back on a computer monitor as progressive and from a standalone, playback on a TV would be 29.97fps interlaced. True??

tyee

[auenf]

if you are encoding a 29.97fps clip, do not use pulldown (unless you just want to swap the field order)

Enf...

[tyee]

Do movie DVDs that you buy have the movie encoded in 23.976fps for NTSC and use the flags to get the 29.97fps output just like we do for our backups?

tyee