Speed up my 1080i processing?

[onesikgypo]

Hi,

I was just curious as to whether there were any ways ic ould speed up the encoding of my 1080i raw captrue streams to xvid - the current method i have at the moment works ok - i was just wondering whether there were any speed imporvements one could recommend, in terms of the avs script.

I currently use the following:

 
LoadPlugin(\"C:\AVISYNTH\DGDecode.dll\")
LoadPlugin(\"C:\AVISYNTH\TIVTC.dll\")
LoadPlugin(\"C:\AVISYNTH\UnDot.dll\")
 
mpeg2source(\"c:\test.d2v\")
 
crop(0,0,1920,1080)
 
HorizontalReduceBy2()

LanczosResize(640,Height)
 
TFM().TDecimate()

VerticalReduceBy2()

LanczosResize(Width,352)
Undot()

For example i heard perhaps if i convert the colour space to YV12 or somethign like that, it coudl speed things up?

Any suggestions would be greatly appreciated.

Thanks in advance!

[jagabo]

Mpeg2Source() should be putting out YV12 already. You can use Info() to verify.

I'd probably use a BilinearResize() instead of HorzontialReduceBy2().LanczosResize(). The latter will probably be over sharp (moire artifacts, halos, buzzing edges). Same for the vertical resize. Yeah, I know, people love over sharp video.

I'm not sure Undot will be doing much of anything after all that downsizing.

I hope this a telecined film source, not interlaced video.

If the video isn't real sharp you may be able to get away with:

mpeg2source(\"c:\test.d2v\")
crop(0,0,1920,1080)
SeparateFields()
SelectEven()
BilinearResize(640,352)
TDecimate()