Edge artifacts noise caused by transitions/dissolve effects.

[baculus]

Hello all,

This is my first post to the forum, so please excuse any blunders I may make!

I have an issue with edge artifacts/noise being caused by transitions when exporting an .avi from both Premiere Cs2 and Cs3. (And viewing the exported clip in Virtualdub or similiar programs.) If I disable the transition, then the noise disappears in the exported .avi. I have tried to use an additive dissolve, cross dissolve, as well as simply adjusting the clip opacity to duplicate a dissolve, but every method I have tried has produced the edge noise/artifacts.

The settings for the project are as follows:
Editing mode: Desktop (standard settings)

Video Rendering:
File format: Video for Windows
Compressor: Huffyyuv v2.1. ("YUV Renderer Fix")

I usually further export the movie as a "Huffyyuv v2.1" movie. (Using the "YUV Renderer Fix" compressor, which I believe is the same as the "Huffyyuv v2.1" Also, I have the project settings set for RGB (RGB compression method: Predict Gradient (Best)), as well as exporting as RGB as opposed to YUV. (Since exported YUV clips tend to crash my VirtualDub, which is an annoyance...)

Incidentally, I had tried everything I could attempt/research to track down the cause of the issue, and I finally disable the transitions, which caused the issue to disappear. So I am pretty sure this issue is related to the transitions. (It took me a week to figure this out, which is a bit fustrating!)

Any help would be much appreciated, and I can provide futher assistance if required.

Thanks in advance!

Baculus

[jagabo]

Try exporting with transitions as uncompressed RGB. If you still have artifacts the problem is in Premiere.

[baculus]

Ok, thanks for the reply. I had thought about doing that, but the uncompressed files are so huge, I didn't think that VirtualDub would be able to compress the files to an Internet-friendly size. But I will go ahead and try that as well.

Thanks again.

[EddyH]

but surely huffyuv is a lossless compression codec ... it should come out the other end much the same as it would without any compression, just taking up less disc space.

unless the rgb <--> yuv conversion is to blame?

[jagabo]

the uncompressed files are so huge

All you need is a short segment around a problematic transition to determine whether it's HuffYUV that's causing the problem or Premiere. Once you know the cause of the problem you can start looking for ways to fix it.

[baculus]

The issue appears to arise if I export, via Huffyuv, as either a YUV or a RGB.

Here is a note, which may add some helpful details: If I export as a .wmv, the issue does not appear.

I think I may export as an uncompressed RGB and perhaps using another codec, such as Indeo, to see if this issue is reoccurring. I guess I was hoping it would be an issue with some configuration which I was overlooking, since I do like the quality to size encoding of Huffyuv vs. othe codecs.

[jagabo]

HuffYUV shouldn't be causing problems like you've described. I use version 2.1.1 on occasion and never noticed anything unusual.

Try using Lagarith if you can. It's another lossless codec that can work in RGB or YUV. It's a little slower than HuffYUV but it compresses better.