NTSC and Progressive frames

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Bloodworth
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NTSC and Progressive frames

Post by Bloodworth » Thu Jul 29, 2010 7:18 pm

So I'm working on a video, and was going to include some footage from a live-action DVD. I ripped the DVD no problem, and the info in DGIndex looks like this for all frames:

Image

The video is from a live concert in America, recorded, edited, produced, sold, and purchased in America. My question is if it really is progressive (can I use force FILM?), or if it's hard telecined, or hybrid, or...? Basically I'm not sure what I should interpret this info as and what to do with it to work with animated sources (possible frame rate issues...?).



On a different topic, I'm helping a friend do an AMV with Ergo Proxy DVDs, and all of them have been ripping fine so far except the first disk. MacTheRipper v2.6.6(?) and v3 both give bad sector issues (and some footage is missing/messed up in the resulting ripped VOBs). We've tried extracting a disk image to rip from using both my mac and his windows 7 computer using various disk imaging software/methodes, but they all error on bad sectors. We've tried DVDFab, but it keeps 'loading' the disk on insertion, eventually resulting in 'application not responding'. Playing the disk in DVD Player on my mac runs into sections that freeze and a text overlay says "skipping bad sections" and the video skips ahead a few seconds, however on my friend's Windows 7 computer, the disk plays PERFECTLY in WMP. Is there some sort of copy-protection at work here or is the disk really bad?

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Qyot27
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Re: NTSC and Progressive frames

Post by Qyot27 » Thu Jul 29, 2010 8:46 pm

Bloodworth wrote:So I'm working on a video, and was going to include some footage from a live-action DVD. I ripped the DVD no problem, and the info in DGIndex looks like this for all frames:

Quoted Image converted to link:
http://a.imageshack.us/img837/5164/nobloodyclue.png

The video is from a live concert in America, recorded, edited, produced, sold, and purchased in America. My question is if it really is progressive (can I use force FILM?), or if it's hard telecined, or hybrid, or...? Basically I'm not sure what I should interpret this info as and what to do with it to work with animated sources (possible frame rate issues...?).
It means it's pure progressive 29.97fps, without pulldown flags and without any interlaced frames. Just because something on a DVD is progressive, doesn't mean Force Film is appropriate. Force Film is meant to remedy pulldown, which means it would register as FILM content (with or without a % sign), not plain NTSC sans percentage.

After indexing you would need a script with only MPEG2Source. No field matching (TFM) or decimation (TDecimate) steps necessary.

This isn't saying there couldn't be a problem with the discs and interlaced footage was encoded as progressive, but my first impulse is that the stream is exactly as the info reading said it was.
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Zarxrax
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Re: NTSC and Progressive frames

Post by Zarxrax » Fri Jul 30, 2010 9:48 am

Basically, you've gotta verify by looking at the footage.
Its very easy to see if its really progressive or not. Do you see any interlaced frames?
Most likely a concert wont be telecined, it will either be full interlaced or full progressive.

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Re: NTSC and Progressive frames

Post by Mister Hatt » Fri Jul 30, 2010 2:45 pm

Qyot27 wrote:It means it's pure progressive 29.97fps, without pulldown flags and without any interlaced frames.
*BZZZZZT* Wrong. It means that in honour pulldown mode, it is progressively coded 30-1%fps. That does NOT mean it hasn't got pulldown flags, and it does NOT mean it isn't interlaced coded progressively. The best thing to do is look at it and do the usual checks to see what you're dealing with.

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Qyot27
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Re: NTSC and Progressive frames

Post by Qyot27 » Fri Jul 30, 2010 5:44 pm

I mentioned interlaced-coded-progressive, and yes, so long as the progressive_sequence marker isn't used (which is the case here; if it had been used Sequence would have read 'Frame only'), there could always be flagging, as these scenarios were brought up not too long ago in the development thread for HCenc. As I said 'first impulse' is that the stream is as what was reported, and what was reported is that the stream is progressive (especially as all my own pure-progressive content registers in exactly the same fashion as that screenshot) - but I still said that there could be issues, implying that double-checking was necessary.
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