Is 1080p cable tv coming soon? - Page 2 - AVS Forum
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post #31 of 38 Old 01-24-2014, 04:35 PM
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Originally Posted by mrvideo View Post

Sory, but duplicate frames are not used for OTA broadcasts. The 2:3 pulldown method is used.

Can you pulldown a progressive video, though? It was my understanding that it only works for interlaced content. If a 24 fps video is broadcast on a 720p60 channel, you already have progressive frames, so are the extra frames generated "on the fly" with pulldown flags during decoding, or is the video pre-padded with duplicate progressive frames to reach 60 fps?
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post #32 of 38 Old 01-24-2014, 04:51 PM
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Originally Posted by mrvideo View Post

That is your TV, not the actual content. Technical disclosure: the frame rate is really 29.97 for 1080i and 59.94 for 720p.

And my TV deinterlaces it to 60 frames a second. Not 30. I see 60 unique frames a second. Please see what I was responding to in my previous post, for context. I've never seen an HDTV that deinterlaces 1080i60 to 1080p30.
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if you were to record the 1080i broadcast of a scripted drama and view it in a video editing program, which I do on a daily basis, when you step through the video you can see the 2:3 pulldown pattern as 2 frames of mixed images followed by 3 frames of single images.

I do not know of any scripted show that is shot at anything but 23.976. Most comedies are shot 1080p23.976 as well. Both are shot at true 23.976 or 1080i recordings using psf (progressive segmented frame).

IVTC of 2:3 pulldown source is extremely easy.

Yes... as i just said in my previous post, a clear 2:3 pattern. I'm hardly a professional but I've mucked about with an OTA HD tuner, VideoRedo, x264, avisynth etc for the better part of a decade now.

Also, I doubt anything is actually shot at 24/1.001 (but I could be wrong) (Edit: never mind the "internet" says I'm wrong). Its just slowed down very slightly from 24fps as a relic of the NTSC color system. We still shoot these programs in 24p, IMO because its then very easy to export to 50Hz countries.
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post #33 of 38 Old 01-24-2014, 04:52 PM
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Quote:
Originally Posted by Aleron Ives View Post

Can you pulldown a progressive video, though? It was my understanding that it only works for interlaced content. If a 24 fps video is broadcast on a 720p60 channel, you already have progressive frames, so are the extra frames generated "on the fly" with pulldown flags during decoding, or is the video pre-padded with duplicate progressive frames to reach 60 fps?

Its not technically pull down. But the duplicate frames can be decimated to make 24p from a 720p60 broadcast. On a 60Hz TV there is really no reason to do so though.
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post #34 of 38 Old 01-24-2014, 07:03 PM
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Originally Posted by Aleron Ives View Post

When NBC ran The Sound of Music Live! for the first time, the fields lined up correctly and allowed the progressive frames to be reconstructed through field matching without deinterlacing (because there was no combing).

That example is not what we were talking about and that was telecined (2:3 pulldown) video. Your example is from live video, which easily could have been shot fully interlaced, i.e., 59.94 fields containing individual images.

Bad 2:3 pulldown video that is broadcast is when the network speeds it up. ABC is horrible when it comes to speeding up programming, destroying the 2:3 pulldown sequence.

What ABC, or any other network does, is moot as I do not watch, let along record, network programming of scripted dramas. Besides the speedup, there is the issue of bugs and snipes, as well as no real closing credits.

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post #35 of 38 Old 01-25-2014, 04:22 PM
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DirecTV's CINEHD channel 125 is 1920x1080/ 24p.

This channel promotes DirecTV Cinema Pay Per View Movies.
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post #36 of 38 Old 01-25-2014, 06:56 PM
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Originally Posted by PiratesCove View Post

DirecTV's CINEHD channel 125 is 1920x1080/ 24p.

This channel promotes DirecTV Cinema Pay Per View Movies.
D has about or as the count is right now 125 to 199, not counting 195 96 97 they are the adult channels. D, list ever thing from 126 to 199 as 1080 P even some of the PPV shows may not be 1080.
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post #37 of 38 Old 01-26-2014, 04:22 PM
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Quote:
Originally Posted by lobosrul View Post

Quote:
Originally Posted by Aleron Ives View Post

Can you pulldown a progressive video, though? It was my understanding that it only works for interlaced content. If a 24 fps video is broadcast on a 720p60 channel, you already have progressive frames, so are the extra frames generated "on the fly" with pulldown flags during decoding, or is the video pre-padded with duplicate progressive frames to reach 60 fps?

Its not technically pull down. But the duplicate frames can be decimated to make 24p from a 720p60 broadcast. On a 60Hz TV there is really no reason to do so though.

720p video does indeed have 2:3 pulldown of 23.976 source video. Instead of doing the pulldown to fields, it is done to frames. So, instead in 2:3 pulldown using 10 1080i fields, it is 2:3 pulldown using 10 720p frames.

So, IVTC of 720p59.94 will result in 720p23.976.

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post #38 of 38 Old 01-26-2014, 04:27 PM
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Originally Posted by lobosrul View Post

Yes... as i just said in my previous post, a clear 2:3 pattern. I'm hardly a professional but I've mucked about with an OTA HD tuner, VideoRedo, x264, avisynth etc for the better part of a decade now.

I get my videos via other sources. I can't stand OTA/cable/DBS, since the shows have all that screen clutter. Plus, there are those networks (ABC) that like to speed up the shows and destroy the 2:3 pulldown cadence.

But, I too use. x264, VideoReDo and avisynth. I even have cygwin on a couple of boxes so that I can write scripts to automate the process of converting 1080i to 1080p.

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