Encode 25fps PAL interlaced to 50fps progressive possible ?

[myhildur]

Hi all,

I use the smoothdeinterlacer filter in the avisynth script to generate 50fps out of the original 25fps interlaced material. I like the quality and want to use Gknot to encode this to a defined size. Can it be done ? my first guess would be that some changes have to be made so Gknot will calculate the correct bitrate. Had a quick look at the source of the bitratecalculator, but I don't know if just adding support for 50fps would do it.

Appreciate any help or clarification on this.

[manono]

Hi and welcome to the forum-

Can it be done ?

I think so. Try this; after you've edited the .avs to include the SmoothDeinterlacer at double-rate, save it and then open it in GKnot, instead of the .d2v. It'll now show twice the number of frames, the same length, no FPS, and a slightly lower bitrate. Then go ahead and set up the 2 passes in the Encoding Control Panel. GKnot will now use the revised bitrate for the encode. I'm pretty sure it'll work OK. I haven't encoded at double-rate, but I've done quite a few silent films at lower fps that GKnot doesn't support, and the revised bitrates work fine for me.

[myhildur]

I have now been testing it out, and it seems to work perfectly using the method you described above. Quite time consuming, but I really like the results.

Thanks alot!