compression problem

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compression problem

Postby valentine » Thu Oct 03, 2002 10:55 am

Ok, so I compressed my footage in premiere as an AVI file with a 360:240 frame size. If I play the compressed file with the source footage open, everything seems fine. Then if I play it again without the color and resolution goes all screwy.

I looked at Ermac's guide, but I couldn't figure out what to do since I can't use divX, and just recompress it. Right now, I can't even seem to get into the compression setting in Premiere at all. :(

This is the first time I've tried to compress any of my vids, so I have no idea what I'm doing (as is probably obvious).

Thanks for your help!
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Postby VegettoEX » Thu Oct 03, 2002 11:10 am

First off, you shouldn't be doing any resizing or compression in Premiere :D

Second, 360x240 is not a standard size. Go with 352x240.

From Premiere, you should always export the most RAW video you can. For example, I export from Premiere as HuffyUV-encoded AVIs at 720x480, 29.97 fps.

I then take THAT AVI (or segmented AVIs) into TMPG (or VirtualDub) and create a compressed version from there (say, an MPEG or DivX).

Don't compress your AVIs in Premiere... you don't distribute compressed AVIs, per say (say, an Indeo 5.11 AVI or a Cinepak AVI).

That's some pretty basic help. I'm sure someone will jump in with a lot more detailed of an explaination :D
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Postby valentine » Thu Oct 03, 2002 12:51 pm

I feel really dumb. <sigh>

How do I reduce frame size in Virtual Dub? I can't find what it's under. It's not under config in compression under video... or at least I can't find it...
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Postby valentine » Thu Oct 03, 2002 1:19 pm

wait...I think i've got it...
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Postby valentine » Thu Oct 03, 2002 2:17 pm

Sorry, I was wrong-- I thought I had changed frame size, but it saved as standard frame size, so the file is huge.
Any ideas?
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Postby klinky » Thu Oct 03, 2002 2:36 pm

Video|Filters - Add Button, Resize, OK, Enter New Width/Height, set Filter Mode to Bilinear. Hit OK.

Then don't forget to goto Video|Compression and setup DivX with a proper bitrate.


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Postby RadicalEd0 » Thu Oct 03, 2002 4:03 pm

Dont use bilinear, use bicubic. Its sharper, and thus harder to compress, but most of u guys use a ridiculous bitrate for your amvs anyway (50 MB for a qD1 file... blasphemy :P ). And it looks better.
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Postby klinky » Thu Oct 03, 2002 4:50 pm

Bah my understanding is it looks 'sharper' :\. Which == harder to compress as RadicalEd0 said. I guess you could try both and see which one "looks" better :p

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Postby RadicalEd0 » Thu Oct 03, 2002 5:16 pm

or u could just use lanczosresize in avisynth 8)
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Postby Zarxrax » Thu Oct 03, 2002 5:43 pm

From my experience, I absolutely cant tell any visible difference between billinear and bicubic. I think billinear is the best bet since it lets the filesize be smaller. Now if you wanna talk about a noticably blurry picture, just encode it to divx5 :wink:
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Postby RadicalEd0 » Thu Oct 03, 2002 6:18 pm

well I just re-checked and at least with the image I was using, its true that bilinear and bicubic alone looked very very similar. Although, both looked inferior to precise bilinear and precise bicubic.
This is where the difference takes effect. Using precice bicubic at the mostly neutral setting of 0.60 bilinear is noticably blurrier. The difference of course between bicubic and bilinear is that bicubic uses a 3x3 overlapping matrix and sharpens the image, whereas bilinear uses 2x2 and slightly softens the image.

Pay attention to details like her eyes
top - bilinear, bottom - bicubic
Image
Image
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Postby klinky » Thu Oct 03, 2002 6:58 pm

To solve this dilema we're going to use what's known as "The Pillow Factor".


So now since you have Pillows, and you want your Pillow to be SOFT, not SHARP. Then SOFTNESS wins out and you see that Billinear is teh WinnAR.


Also not that I some how saw the picture of Su-chan and then looked up and I thought you spelt "pubic" instead of bicubic, which is another reason for not to use bicubic.


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Postby klinky » Thu Oct 03, 2002 7:00 pm

WOW that was almost as poorly written as it was thought out :p


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Postby RadicalEd0 » Thu Oct 03, 2002 7:14 pm

lol.. bipubic..
anyway, I only use bilinear when I need extra compressibility for say 1CD rips and such, not when the bitrate isn't much a limiting factor. I see no use for bilinear since you can set the strength of bicubic's sharpening (0.3, 0.5, 0.6, 0.75, etc). And not to be critical but ur pillow analogy wasn't very scientifically sound :P 20:20 vision is favored over 50:20 (or is it 20:50 :/ ) because you're eyes can handle a higher resolution or sharpness. So, youd rather have a video that looks like you're seeing it through 20:20 vision and not 50:20, right?
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Postby klinky » Thu Oct 03, 2002 7:22 pm

RadicalEd0 wrote:lol.. bipubic..
anyway, I only use bilinear when I need extra compressibility for say 1CD rips and such, not when the bitrate isn't much a limiting factor. I see no use for bilinear since you can set the strength of bicubic's sharpening (0.3, 0.5, 0.6, 0.75, etc). And not to be critical but ur pillow analogy wasn't very scientifically sound :P 20:20 vision is favored over 50:20 (or is it 20:50 :/ ) because you're eyes can handle a higher resolution or sharpness. So, youd rather have a video that looks like you're seeing it through 20:20 vision and not 50:20, right?



Incase you're a tard :twisted: on the vision tests, one score is for your left eye:right eye. So you're nearly blind in one fucking eye and yet you can see perfect in the other one. I think you probably would be seeing 50:20 because you poked your left eye out on the SHARP pillow you were sleeping on.

Thus bilinear wins out again.

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