Premiere and DViX. The problems of a MV creator. :)

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Premiere and DViX. The problems of a MV creator. :)

Postby sbsbaker » Mon Jul 08, 2002 10:47 pm

Yes. I've been having problems with premiere 6 since i installed XP Pro on my machine. I know it's not my hardware, cause while running on 98, it ran real smooth with no probs....and i'm well over the reqs for running xp...

Here's the lowdown :
When I start working in Premiere, i open a clip to edit it, and it's instant lag. It takes at least 35 seconds to get a clip, and move it into the timeline, thats without rendering....at first i thought it was Premiere being crap with XP, but then i pulled in a clip that i had rendered from After Effects, and it worked just fine.

So, using my instincts, i looked at my codec. DiVX 5.02 Pro. I REALLY don't want to use this codec, im not a big DiVX fan. If anyone knows where i could get JUST a MPEG4 codec, with no DiVX, Please help me. :).

I also have an AE question..how does one make the glowing effect around the clip to give it the dream effect? :)

Thanks for you're help, i know the quality of the help from this server is REALLY good. :)
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Postby klinky » Mon Jul 08, 2002 11:38 pm

DivX is a interation of MPEG4, the problem here is not DivX, it's the MPEG4 spec and basically how all lossy compression codecs work.

With most lossy codecs, you have keyframes and intra-frames. The keyframe is a entire picture, complete. The keyframes take up a large amount of space so you have intra-frames which captures only parts of the picture that have changed since the keyframe took a complete shot.

If you play a file from start to finish it works fine, you won't notice it. When you try to seek with the file though, it first has to go back and find a keyframe, then seek through the file and "build up" to where you're trying to seek to.

So if you have a keyframe every 200 frames, and you need to get say frame 599, then it first has to go back to the keyframe on 400 and decompress all the frames up to 599. So it's really slow. Most video files though don't do it that way. Alot of them put a keyframe on scene changes or about every 3 - 10 seconds.

If you use a lossless or semi-lossless codec like HUFFYuv or MJPEG(lossless version), then it's practically like having each frame as a keyframe so seeking is speedy. Plus no information is lost in the process.


~klinky
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