Divx Bitrate Adjustment - Low Motion or High Motion? TmpgEnc Xpress 4

[Sliztzan]

I've always left it on default of 0.18, but I read that this can determine a better quality end result if set properly.
Is there any guidelines on how to set this correctly for the source video I'm converting? The source of the one I'm working on now is DVD. But I'm guessing that really has nothing to do with the setting, that is is based on the actual motion of the movie...like a fast pace action movie (high motion) or a love story with no action (low motion)?

Any suggestions would be greatly appreciated. Thank you

[jagabo]

I believe that setting effects how quickly the encoder adjusts the bitrate when there are sudden changes in the amount of motion. For example, a quick fade-to-black (the equivalent of high motion because every pixel is changing with each frame) may take only 1/4 second. Using a fast response setting will keep that fade from breaking up into macroblock artifacts because the encoder will immediately raise the bitrate to accomodate it. Using a slow response setting will allow it to break up into macroblocks because it's of such short duration -- maybe you won't notice or just don't care.

If you switch to single pass quality based encoding you won't have to worry about it. You won't have to worry about what bitrate is right for your video, every video will have the quality you specify, at every frame, regardless of the amount of motion, noise, action, etc. The videos will come out with whatever bitrate is required to achieve that quality. Your encodings will go twice as fast since they will require only one pass. Reducing the Performance setting from Insane to Better will make the encoding twice as fast again and there will be no visible difference in quality.

[Sliztzan]

Thanks for added information. I still don't know how to set this, and looking for someone who knows.

I'm going to try your other suggested settings with a partial clip and compare it to my settings. Thanks for your suggestions. I hope it does work as well because this particular encode is indicating it will take around 50hrs due to my filter settings. The dvd quality is very noisy. Any help with reducing the time needed is always a plus.

[jagabo]

If filtering is taking the majority of that 50 hours switching to single pass encoding will cut the encoding time in half.

With constant quality encoding you select a quantizer value to determine the quality. A setting of 3 is a pretty good compromise between quality and file size. If you want higher quality try 2. The file will be larger of course. If you want a smaller file try a quantizer of 4. You can use any value from 1 to 31, including non-integer values like 2.5.

[Sliztzan]

Still looking for answer on how to set.

[Sliztzan]

I'm sure someone here knows more about this. Please explain.