a few questions about video editing

[James Sharp]

Ok i have a real quick question.. i have been reading the ermac guide to all things video.. and i have a few questions that are nagging at me..


First.. Is interlacing the same thing as teleclining, as also is deinterlacing the same thing as inverse teleclining..

second.. does the process of inverse teleclining footage change it from 29.97 frames a second into 23.97

Third: in this guide it says that it highly suggests editing in the 23.97 format.. why is this?
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I think what the guides mean is that.. if you deinterlace your source footage before you edit.. it changes the frame rate from 29.97 to 23.97. and as such less frames means less size.. and stuff right?

[Orwell]

It suggests NOT editing in 23.97, because no version of premiere, except maybe 2.0?, will interpret the footage well, some not at all.

[James Sharp]

Really?

What was meant when this was said

If you are using a codec that supports 23.976 FPS video (i.e. you're not editing using special hardware like a DC30/DV500 or something like that) I highly suggest editing in this format. It requires an extra step of preparation, but you wind up with smaller or better looking files at the end. Once everything is done, and you want to convert the video back into 29.97 FPS, it's quite easy to simply reverse the process on the final product. But you will end up with much more "film like" video and better image quality overall.

However, if you're editing in something like DV, which does not support any framerate besides 29.97 or 25, then you do not have this option.

Doesnt that mean if i have program that supports it.. it will give me a much higher quality pic?


man i hate to say it. but im getting confused.

[Orwell]

Can you link to the specific part of the guide? I don't think I've ever seen that in there, unless its the original EADFAG?

Also, framerate has nothing to do with quality.

[James Sharp]

ya its the last paragraph of this page:

http://www.animemusicvideos.org/guides/ ... deo2_2.htm




[/quote]

[Orwell]

Ignore it and take what you find useful from the guides? A lot of what's in there, is at least to me, useless in practical application. If it works, don't touch it.

[Willen]

First.. Is interlacing the same thing as teleclining, as also is deinterlacing the same thing as inverse teleclining..

Telecine (http://en.wikipedia.org/wiki/Telecine) is a process for converting film which is 24 frames per second, to NTSC (http://en.wikipedia.org/wiki/NTSC) video which is 29.97 frames per second.

Interlace (http://en.wikipedia.org/wiki/Interlace) allows television broadcasts in higher quality without using higher bandwidth. You take video at 29.97 frames per second, split the 480 line frames into even and odd lines and send the signal at twice the rate: 59.94 fields per second, sending 240 lines at a time. The problem with interlace is you can end up with interlacing artifacts (combing, twitter, flicker, etc) and editing with interlaced video (without de-interlacing it first) can compound these problems. Especially if you do speed changes (slowdown, speedup) to the footage.

Deinterlacing restores the progressive frames from 59.94 field per second video footage back to 29.97 frames per second. Doing this also gets rid of the interlacing problems I described above. Deinterlacing will not change the framerate of the video. 29.97 fps interlaced video will stay at 29.97 fps, but will end up without the interlacing. But if this video was originally film footage at 24 frames per second, there is still another problem...

Inverse Telecine (IVTC) fixes this last problem by restoring the original 24 frames per second frame rate of the film (slowed down 0.1% to 23.976 fps for NTSC video which runs 29.97 fps, which is 0.1% slower than 30 fps due to color encoding issues with NTSC). IVTC will change the framerate of the video footage. 29.97 fps video will end up at film's 23.976 fps. De-interlacing is also performed during the process of IVTC so no separate de-interlace step is necessary.

second.. does the process of inverse teleclining footage change it from 29.97 frames a second into 23.97

Yes.

Third: in this guide it says that it highly suggests editing in the 23.97 format.. why is this?

If your footage was originally 24 fps film or animated at 24 fps (or one of the fractions, 12 fps, 8 fps, etc.) you can eliminate many of the visual issues you see in the pre-IVTC images on the left column of the page you linked to: http://www.animemusicvideos.org/guides/ ... deo2_2.htm. If the footage was animated at 30 fps (like some CGI sequences and certain Opening and Closing credits), then you may wish to stay with 29.97 fps. Ultimately, it comes down to personal preference. But...

I think what the guides mean is that.. if you <s>deinterlace</s> Inverse Telecine your source footage before you edit.. it changes the frame rate from 29.97 to 23.97. and as such less frames means less size.. and stuff right?

Statement corrected. But essentially, yes, since you are storing 23.976 fps instead of 29.97 fps. 6 frames less frames per second = smaller files. The longer the video, the greater the savings.

To clarify what Orwell said, if you are using Adobe Premiere, you have 2 options for framerates if editing NTSC footage: 24 fps or 29.97 fps. Premiere doesn't correctly support 23.976 fps (even in Pro). EADFAG on Premiere's 24 fps (23.976 fps) editing. So depending on your footage and editing preference, you can edit 23.976 fps footage in Premeire, BUT you should convert it to 24 fps first to avoid any issues.