Why do FILTERS take so LONG

[hacker_on_fire]

i encoded part of a film, and found out it had macroblocks. So i decided 2 use the smart smooth filter in Virtual Dub. I than began to recode. But it was doing 2/3 fps. This would take forever. Its not my computer as it is 1.6ghz.

So whats taking it so long?

Can i enocode the 1st pass without the filter and then add the filter for the 2nd pass?

Please help

[benderman]

You CAN encode the 1st pass without the filters, but the result will be better with all filters applied. Depends very much on how much the filter changes the picture.

Some filters take very long because they are not optimized and are more precise than neccesary. Most times a simple and fast filter works as good as a very complex and slow filter because after the compression you wouldn't notice the small difference.

Smoothing: Normaly the smoothing effect of the bilinear resizing is enough to prevent makroblocks.

[hacker_on_fire]

Originally posted by benderman
Smoothing: Normaly the smoothing effect of the bilinear resizing is enough to prevent makroblocks.

i am using the Smart Smooth filter. It is not bulit in, it had 2 download it. i looked at the preview screen and it was just how i wanted. it looked like it prevented the macro blocking.

Originally posted by benderman
Some filters take very long because they are not optimized and are more precise than neccesary. Most times a simple and fast filter works as good as a very complex and slow filter because after the compression you wouldn't notice the small difference.

Could you tell me a fast but good smoothing filter, or one that get rids of macroblocks.

Originally posted by benderman
You CAN encode the 1st pass without the filters, but the result will be better with all filters applied. Depends very much on how much the filter changes the picture.

so your saying its better to apply filters with the 1st pass rather than with the 2nd pass

[benderman]

If I convert DVDs to DivX I always resize the video with the bilinear resizing-filter. That's enought smoothing for me. For more smoothing the internal smoother works good and fast enough.

1st- /2nd-pass: You NEED to apply the filters for the 2nd pass because that is where the final picture is encoded. If you don't apply it for the 1st pass the difference is not very big because in the 1st pass the video is only analyzed for the complexity of every picture. And that would not be very different with or without filters. For maximum quality and smallest files you should use all needed filters with both passes.

[hacker_on_fire]

Originally posted by benderman
If I convert DVDs to DivX I always resize the video with the bilinear resizing-filter. That's enought smoothing for me. For more smoothing the internal smoother works good and fast enough.

You said you use the bilinear resizing filter. How do you use this? And with what programme?
Also my divX files are ok if they are not full screen. But when they are full screen you can see macroblocks