Deinterlacing PAL DVD

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Hello everybody,

Please advise what would be the best way to deinterlace a PAL DVD in order to convert it to NTSC DVD (DGPulldown).

Thank you!

[Guest34343]

It's hard to say what's "best" because there are so many subjective factors. Also, you might really have progressive video that just looks interlaced (because it is phase-shifted by one field).

Assuming that you really do have interlaced PAL video, then I like LeakKernelDeint(), which runs under Avisynth. Other people like TDeint().

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Thank you!

My God, I never heard of "LeakKernelDeint()". I hope you are not kidding on me.

I like what I am doing but with every step it is geting more and more complicated.

To convert avi and PAL DVDs to NTSC, I set up a plan. It looks pretty simple but every step brings something new like "LeakKernelDeint()" and I cannot move forward

Please criticize my plan but advise something useful.

1. Join AVI files with VirtualDub into one AVI file
2. Check, if it’s an AVI movie, for bad frames with Vdub_MP3_Freeze
2. Demux the video and audio streams with Decrypter (DVD) or
VirtualDubMod (AVI)
3. Check with GSpot whether the movie is interlaced or progressive
4. If the video is interlaced, deinterlace it to make it progressive (but I am not sure how to do this).
5. Resize the video to 720x480 with AviSynth script (the tool does not show preview, I do not know why ???).
6. Add picture quality filters with AviSynth script, if required
7. Use Bitrate Calcilator to determine bitrates
8. Encode the video to MPEG2 at 25fps progressive with CCE or Procoder.
9. Run DGPulldown on the video MPEG2 stream to flag it up to 29.97fps (using
the 25fps --> 29.97fps conversion)
10. Mux the audio and video into a program stream (MuxMan or Rejig), or
author a DVD using the audio and video streams (TSUNAMY MPEG
Encoder)
11. Check for compatibility with DVD Shrink
12. If problems found, run the movie through FixVTS
13. Check again with DVD Shrink
14. Burn

Thank you!

AVIScript (full version) gives error message: Video not avialable cannot find vids msvc decompressor.

What does this mean?

Thank you!

[manono]

2. You're not going to demux an AVI with DVD Decrypter, so maybe you're using this workflow for both AVI and DVD sources, and adapting, depending on what you have. I demux DVD VOBs on the hard drive with either PGCDemux or DGIndex.

3. Don't depend on GSpot, DGIndex, or anything else, to tell you if it's interlaced or not. Depend solely on your eyes. The vast majority of PAL DVDs are encoded as interlaced (what GSpot, DGIndex, and others tell you), but the sources are progressive. There's a big difference there. If you don't see interlacing, don't ruin it with a deinterlacer. If the source is a movie, then almost certainly it's not interlaced. There are some exceptions to that though, the shifted fields as mentioned by neuron2 (which can be easily corrected), and bad NTSC2PAL conversions (which can also be corrected, but with greater difficulty).

4. Refer to my answer to 3. Never deinterlace unless you're 100% sure it's interlaced.

AVIScript (full version) gives error message: Video not avialable cannot find vids msvc decompressor.

Some kind of a codec is missing. Is this an error from VDub(Mod)? If not, open it in there and relay the error message.

You can find LeakKernelDeint at the bottom of this page (and take particular notice of whose site it is):

http://neuron2.net/kerneldeint/kerneldeint.html

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manono,

Thank you very much for your response.

I will follow your advice and analyze the stuff anew. I hope once I go through it once, the second time it will be easier.

"Some kind of a codec is missing." - I have everything in the world installed including K-Lite Pack but I know you are right.

The problem is how to determine: which one is missing?

Thank you again!

[dphirschler]

3. Don't depend on GSpot, DGIndex, or anything else, to tell you if it's interlaced or not. Depend solely on your eyes. The vast majority of PAL DVDs are encoded as interlaced (what GSpot, DGIndex, and others tell you), but the sources are progressive. There's a big difference there. If you don't see interlacing, don't ruin it with a deinterlacer. If the source is a movie, then almost certainly it's not interlaced. There are some exceptions to that though, the shifted fields as mentioned by neuron2 (which can be easily corrected), and bad NTSC2PAL conversions (which can also be corrected, but with greater difficulty).

I just want to echo what's been said here. I've come across many PAL sources that are progressive, but were broadcast (or recorded) interlaced. I've been using Decomb to bring the two fields back together to form the progressive frame. Although I was not surprised that PAL broadcasts and VHS recordings were like this, I am surprised DVDs are being sold this way. One has to wonder why?


Darryl

[manono]

Hi-

The problem is how to determine: which one is missing?

That's why I asked if that was a VDub message. It didn't make any sense to me either. I'm no expert on that kind of thing, and can't help there. Sorry.

dphirschler-

Oh, so those phase-shifted movies are common in PAL broadcasts? Because they're sometimes found, but not commonly, in PAL DVDs. And as you know, Decomb's Telecide fixes them right up. So much better than deinterlacing.

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manono,

Thank you!

The message is on the AViSynthscript screen when I am trying to open avi file preview. The scree does not show the picture but the message instead.

It looks like it is yv12 avi codec. At least my research advises this.

Do I understand you right that if I am happy with the picture, I can miss the deinterlacing step?

For is for me confusing, it is "rely on your eyes". What if I do not see it but it is there. I mean interlacing. Are there more precise intruments to determine whether I need deinterlacing or not?

yv12 requires Quicktime to be installed while I have already the latest version of Quicktime installed. What is the way around here?

Thank you!

[manono]

Do you mean a YV12 codec? Then install XviD, if you haven't already.

Yes, make a simple AviSynth script, with no filtering (no IVTC or deinterlacer). Open it in VDub(Mod), find a place with motion and advance a frame at a time. If you don't see any interlacing, it's not interlaced, and you don't need a deinterlacer. You can zoom in 150 or 200% for a closer look. Your eyes are good enough. If you know what it looks like, you won't have any trouble seeing it during a motion sequence.

There are "more precise instruments" but you don't need to use them.

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manono,

Thank you! I am completly stuck with the stuff and looks like this affects my common sense -)

[dphirschler]

dphirschler-

Oh, so those phase-shifted movies are common in PAL broadcasts? Because they're sometimes found, but not commonly, in PAL DVDs. And as you know, Decomb's Telecide fixes them right up. So much better than deinterlacing.

I believe what I was describing is called 2:2 pulldown. And yes, I see it all the time in PAL tapes I get. Keep in mind I live in America, so I don't see PAL broadcasts on a daily basis... only the tapes I ocassionally get. Even my VHS of "Song of the South" had this 2:2 pulldown happening.

Decomb fixes it right up, although I don't think I used Telecide. Isn't Telecide used for removing duplicate frames? There is also a Virtualdub filter, but I cannot remember the name of it. I prefer to work in AviSynth anyways.

One way to give yourself a good idea of whether or not it is interlaced or progressive is to just think about it for a little while. If it is a live broadcast (news, sports) then it is typically video (25 fps interlaced). If it is a movie, animated cartoon, or some professional production that isn't broadcast live, then it is probably film (24 fps progressive). Film is usually sped up 4% and broadcast progressive at 25 fps... and of course it may have the 2:2 pulldown thing happening... if that is even what it's called.


Darryl

[Guest34343]

Decomb fixes it right up, although I don't think I used Telecide. Isn't Telecide used for removing duplicate frames?

Decomb is the name of the tools package (also the name of the DLL). The tools package contains Telecide(), Decimate(), and FieldDeinterlace(). It is indeed Telecide() that realigns fields. It is Decimate() that removes duplicates. So you in fact did use Telecide() to correct the PAL phase shift.