Alternate method for progressive editing-- will this work?

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Alternate method for progressive editing-- will this work?

Postby Studio Hooghly » Mon Nov 04, 2002 11:21 am

Something just occurred to me, but I'm not sure that it's actually a good idea. It's so simple, and it's not documented in ErMaC's guide, so it's probably awful. Anyway, here's what I've got.

I wanted to get the best possible video quality (natch) from my Cowboy Bebop DVD rips, so I experimented with the Decomb filter. Just as ErMaC said, it makes things horribly slow when you try to edit. But what would happen if you did all the editing interlaced, and then swapped to progressive before you exported? By which I mean, as an example, the text of the .avs file for "Black Dog Serenade" while I'm editing looks like this:

LoadPlugin("C:\MPEG2DEC.DLL")
MPEG2Source("C:\bebop\blackdog.d2v")

But when I'm ready to export the video, I change it to this:

LoadPlugin("C:\MPEG2DEC.DLL")
MPEG2Source("C:\bebop\blackdog.d2v")
LoadPlugin("C:\AVSFilters\decomb.dll")
Telecide(post=false)
Decimate(5)

Preliminary tests seem to indicate that this works. Have I stumbled upon the best of both worlds, or is there something terrible that I haven't noticed?

Nathan Rosen
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Postby Zarxrax » Mon Nov 04, 2002 12:29 pm

I'm fairly sure that If you do that your edits might not come out correct. Especially anything thats timed with frame accuracy.
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Postby Zarxrax » Mon Nov 04, 2002 12:31 pm

Oh, an easier method that would work 100% though, would be just make low quality mjpeg versions of the decombed video, and edit from that. Then replace these with your avisynth scripts when you export.
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Postby AbsoluteDestiny » Mon Nov 04, 2002 12:35 pm

You would be insane to do this, for lots of reasons but essentially what will happen is after the timebase conversion, most of the clips will have frame discrepancies. You are basically throwing frame-accuarcy out of the window.

You'd be MUCH better off using Method 3 as it gives you speed, accuracy and maximum quality.
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Postby turboneko » Mon Nov 04, 2002 12:36 pm

Editing interlaced footage will almost surely end up in destroying the telecining pattern (since you cut and edit at arbitrary frames of the stream).
Even if it's not the worst disaster in the world, it won't allow you to reconstruct the original progressive frames = you have to deinterlace all the frames that come out still interlaced from IVTC with blending or any other deinterlace method.

In other words: IVTC before editing still means the best quality ;)
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Postby AbsoluteDestiny » Mon Nov 04, 2002 12:37 pm

Oh, an easier method that would work 100% though, would be just make low quality mjpeg versions


um... Zarxrax. You posted before I replied - have you read the guide lately... that's exactly what it tells you to do ^^
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Postby Studio Hooghly » Mon Nov 04, 2002 12:57 pm

Ah. I thought it sounded too good to be true. Thanks for the tips, and I withdraw the question.
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Postby The Wired Knight » Mon Nov 04, 2002 5:24 pm

I'm tired so I'm just gonna sum up everything I meant to say in a sentance.

Intentionally editing and messing with interlacing is like plaing golf on a mine field.
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Postby trythil » Mon Nov 04, 2002 8:44 pm

The Wired Knight wrote:I'm tired so I'm just gonna sum up everything I meant to say in a sentance.

Intentionally editing and messing with interlacing is like plaing golf on a mine field.


So that makes me suicidal. Excellent.
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