Resizing Extras With Avisynth Question.

[Master Yoda]

OK, im gonna resize the extras on a dvd to cvd resolution (352 x 576 ). Im adding this to my script ....

crop(8,0,-8,0)
bicubicresize(352,576)

Now the extras are interlaced, so normally i would encode them interlaced.But i have'nt before resized the extras.Now when resizing to this resolution should i be deinterlacing or not, as i've read alot of times not to deinterlace , which i dont as i said, but when resizing do i ??

I've also read that on mpeg2 files that have a low avg. bitrate should be deinterlaced. (avg. 2000)

[Kedirekin]

Since you're not decreasing the vertical resolution, I wouldn't deinterlace.

Incidentally, if your were decreasing the vertical resolution to VCD resolution (352x288), interlacing becomes less of an issue, because the picture is basically line-doubled on playback. However, the method you use to resize can have some impact on playback quality. For example, simply resizing can introduce ghosting (because you're combining two different points in time). I've heard using the Bob filter before resizing is the best approach.

For really low bitrates, deinterlacing is an attempt to get more efficiency out of the encoder (by making the frames more progressive-like). It's a trade off between one type of quality loss and another - a trade off that you can only really determine yourself, and only on a case-by-case basis.