Another IVTC problem

[elmuz]

Hi all,
I'm dealing with lots of music videos from '90s and 80's... Most of them come into a NTSC format.
I suspect they were originally shooted in 24p or maybe PAL (as they show european artists), so I'm fighting with IVTC...
Is there any guide to recognize the original shooting speed from Telecined (blended) videoclip?
Here's an example of few seconds...
As we work in 720p25, we need to use inserts from those clips during NLE jobs... Avisynth would perfect for restoring...
Could you give the parameters of 'Srestore()' and 'Yadif()' and explain why...
Even if you suggest some other filter (maybe for colors)...
Thank you in advance...

elmuz

[poisondeathray]

No blends in this sample. This is standard 3:2 telecine .

You can separate the fields and see they are clear without blends , and in a 3:2 pattern . You can use this as a guide
http://neuron2.net/faq.html#analysis

There is a bit of dot crawl , you could use something like checkmate() or tcomb() before you IVTC , but they do smooth the picture a bit

[elmuz]

Really really thank you!

[poisondeathray]

If you want to insert into a 720p25 project , I would do a IVTC in avisynth then do a PAL speed up from 23.976 (24000/1001) => 25 , including the audio before inserting into your NLE. This way you don't introduce any blends or extra frames. But note some people are intolerant of the pitch shift in the audio, especially with audio centered pieces , like music vids.

Do you plan on upscaling or leaving it as a SD piece in a HD project ? It may make the dotcrawl worse and more noticeable. Unfortunately the filters that take care of dotcrawl also blur the image a bit - which isn't good if you're trying to upscale. Pick your poison

[elmuz]

Well, nowdays in my company they use to import videoclip into Premiere HD project... They take let's say 20seconds of a song and it goes full screen... So now is Premiere which upscales and changes fps: you can imagine the stupid blurred effect coming out...
So I offered myself processing clip before they use them in Premiere...
I am doing some tests at the moment and I will use your advice..

elmuz

[elmuz]

And what about this?

Even in single fields you can see blending traces... which chain of filters would you suggest?

elmuz

[manono]

The test_madonna.zip has been field-blended from a PAL source.

Yadif(Mode=1)#or your favorite bobber
SRestore()

handles it fine.

[elmuz]

Thank you! ...one question: how can you recognize if a NTSC video comes from a 24p or PAL source?
And correct me if I'm wrong...
After Yadif(Mode=1).SRestore() we get always 24p video... so if we want a PAL source as output what should I append as a filter? And what for audio? ...always talking about Avisynth...

Thank you in advance

[manono]

If you separate the fields or put on a bobber and see the blends/ghosts/double images, then most likely it's from a PAL source. But not always. Sometimes (maybe one in a hundred) you'll have field blends from an NTSC source). If you see no blends at all, then it's either from a film source or it's pure interlace. Unless it's both not blended and from a PAL source (about one in a thousand chance of that).

And correct me if I'm wrong...

OK, you're wrong. To find the framerate, open your script in VDub(Mod) and go File->File Information. Or read the included SRestore doc to find out what you get when using SRestore at default settings on an NTSC source.