A tip to newbies from a newbie

[madoka]

When using AviSynth to frameserve to VirtualDub, do NOT run filters with AviSynth AND VirtualDub at the same time. Run all processing with AviSynth, and then use VirtualDub in Fast Recompress mode. This increased framerate by 50% for me.

Had to find this out the hard way after experimenting for about a week. Don't let this happen to you.

[movmasty]

saving you another week of work.....
dont use fast recompress but normal compress if you are outputting a final video, size in divx will be often higer .

let me know, why you use avisynth?

[madoka]

Originally posted by movmasty
saving you another week of work.....
dont use fast recompress but normal compress if you are outputting a final video, size in divx will be often higer .

Can you clarify that? Do you mean that Fast Recompress will generate larger output than Normal Recompress with other settings held constant? If so, why is that?

let me know, why you use avisynth?

Because I use Decomb, and I'm not aware of any other way to feed MPEG2 into VirtualDub except VFAPI, which is slow.

[theReal]

Gordian Knot also uses nandub with fast recompress and the filesize is perfect every time.

Using Avisynth is a good idea because Avisynth filters (e.g. temporalsoften, bicubicresize) are the best filters you can get!

[movmasty]

yes, avisynth filters are good, for this i asked

is clear that if you use a fixed targed bitrate the size will be the same with fast compress
but
if you use a fixed quantizer, size will be often larger
then,presumibily, quality is worst with fast compress at a given bitrate...

[Teegedeck]

Excuse me for saying this, but I guess on the newbie-forum, I MUST: Not everyone is as much of an expert as he/she thinks to be... If a piece of advice obviously contradicts things you've read in the guides around here or if an adivce apparently causes harsh objections from other users, then you might draw the conclusion that this advice may perhaps not be based on solid facts. Be critical and try to verify some things yourself.

[movmasty]

what ??? :confused:

[diji1]

Not everyone is as much of an expert as he/she thinks to be...

That's very good advice to heed ppl ...

what ???

... well, maybe he's talking about the notion that fast recompress leads to larger file sizes on the second pass - basically, it doesn't ( or i fluke my filesize everytime ... er, no, it don't, ahem ;) ). In my experience fast recompress ( avisynth ) as opposed to full processing mode ( vfapi ) leads to exactly the same quality and filesize when used on the second pass.
Full processing is faster, that is the only advantage if u disregard filters for each method. You should be using full processing mode for the first pass regardless or u will suffer a slight to big loss in quality in ur final .avi file as fast recompress diddles the luma values collected in the first pass.

... or so i read ... :devil: