does exist interlaced format > 25/30 fps?

[marcorocchini]

for example, does exist a 50fps or 60fps interlaced, meaning not at 50i 60i but with 2 field ... or 120 fps interlaced ?

can I expect that in any case an interlaced format can never be different from the classic pal 25fps (50i) or 30fps NTSC (60i) (even if at a HD resolution) ?

or can I expect that in any case is impossible that mediainfo say "scan type = interlaced" and the FPS value is more than 30 ?

thanks

[manono]

You can interlace anything you want. Whether you should or not, or whether it abides by a standard or not, or whether your player can play it or not (and deinterlace it) are different questions entirely.

[racer-x]

For someone who supposedly produces broadcast material, you sure ask a lot of silly questions. Time to put that catnip away.....

Your 2nd sentence is the right choice.

[marcorocchini]

never produces broadcast material, only I have a small broadcats newtwork in my home for my 5 cats. And I'm a lot ignorant of video, as you can see

[_Al_]

please don't start threads like this, otherwise broadcasters might read this a get some stupid ideas about distributing 4k in some "cheaper" interlaced form

[Cornucopia]

The "STANDARD" 25i (25frames/50fields) or 29.97i (29.97frames/59.94fields) are the ONLY CE-based international formats that make use of interlace. All CE formats from here on out will likely be Progressive. So there won't ever be a true 50i or 59.94i, nor a 100i or 119.88i, etc.

Interlacing was a compromise shortcut because AT THE TIME, the electronics could handle the bandwidth/space requirements of a fully progressive signal at full resolution & framerate, and the engineers didn't want to provide a noticeably-lesser quality version in the form of 1/2 resolution or 1/2 framerate. Interlacing was also a kind of a "cheat", since people don't really fully perceive that they aren't getting the full information (unless it were shown to them side-by-side).

If current/future engineers want to compromise on future bandwidth constraints, they now have many more options: bitrate compression, fallback to HD or SD rez, further color subsampling, etc.

Manono has already told you that it is POSSIBLE to interlace anything, even if that's not the right thing to do. And, there are plenty of people in the world with little understanding of video who, like yourself, might have no qualms about producing non-standard video. So, if you are in the habit of getting material from a variety of p2p sources, it is possible you may end up encountering a framerate that is higher than 30 that is interlaced. But if you stick to broadcast or professionally streamed sources, you WON'T ever encounter such things.

How you code your (whatever it is you are attempting) will be determined by your habits, then.

...That last post explains a lot.

Scott

[hello_hello]

And, there are plenty of people in the world with little understanding of video who, like yourself, might have no qualms about producing non-standard video.

How can someone have qualms about doing something non-standard if they don't have enough understanding of video to know it's non-standard?

So, if you are in the habit of getting material from a variety of p2p sources, it is possible you may end up encountering a framerate that is higher than 30 that is interlaced. But if you stick to broadcast or professionally streamed sources, you WON'T ever encounter such things.

I gotta admit, that sounds fairly unlikely. I've never seen p2p interlaced video with a frame rate higher than 30. I'm trying to imagine a circumstance that could lead to the creation of such video.
The "scene" encoders have to abide by fairly strict rules. They somehow get together and agree on how things should be done. I don't know how it works exactly but the end result is the quality control is actually pretty high.
http://scenerules.irc.gs/t.html?id=2011_TV_X264_u1.nfo
http://scenerules.irc.gs/t.html?id=2012_SDTVx264u1.nfo
Sure you might get the odd person who's encoded one of their own DVDs, done it pretty badly and uploaded it to a p2p site, so every now and then you might come across something with the wrong aspect ratio, or a video encoded as progressive without being de-interlaced, or something encoded at too high a resolution for the bitrate etc, or some combination of awful, but the "higher than 30fps" interlaced video thing..... that seems like a bit of a stretch.

[Cornucopia]

@hello_hello: qualms, you got me there!

a stretch? sure, but no more so than the great majority of the OP's posts.

The OP has had good video practices suggested/explained to him a number of times, and yet here we still are.

Scott

[pandy]

manono already provided information, remain are advises you may (or not) follow - you can interlace anything you want, if you use correct software and hardware then everything should be fine.