Log in

View Full Version : AviSynth and CoreDuo CPU


CNemo
14th November 2006, 22:31
Hi Friends!

I have a laptop with CoreDuo and would like to use it for encoding because of great power.

However when i frameserve there with last AviSynth RC 1 i have very bad quality. Encoded video has a lot of visible blocks and jumps.

I understand that it possibly may be encoder problem as well, but decided to start here because it's down the pipe.

When i encode HC shows strange jumps in frame rate from 5 to 400! I think it's what i see as jumps in encoded video.

Also when i do F6 in AviSynth Editor (External Preview) i have several jumps at the beginning of the process.

The question is if it might be related to my hardware configuration. Disk is relatively slow and CPU is decent one with 2 cores. Is there any dependency on the disk speed, number of cores? Do i need to set process affinity or something?

If encode with same script and settings on the old comp - everything is fine.

Blue_MiSfit
14th November 2006, 23:45
what happens if you drop the script in virtual dub and preview it?

foxyshadis
15th November 2006, 00:32
Are you using directshowsource? If so, the different filters on your old and new system could be causing that. Post your full script, please.

CNemo
15th November 2006, 02:12
VD seems to be OK.

I have fresh Windows installed on both machies. Yes, I use DirectShowSource. One machine has KLite pack. Another has defaul set of codect + Xvid, Panasonic DV and DivX. This one works great. Loaded with KLite - no.

Script is very basic:

DirectShowSource(...)
Trim()
Tweak(...)
ConvertToYV12()

By some reason i tink it's because CPU has 2 cores, so process jumps from one to another.

Is it possible that slow disk on laptop causes such problems?

CNemo
15th November 2006, 03:00
I think i found something additionally.

When file is opened with DirectShowSource everything looks fine in player. But same file opened with AviSource looks corrupted. It makes hiss sound and some frames is just a color mess. Appers to be very similar in time with problems in encoded stream.

CNemo
15th November 2006, 03:09
I've installed Panasonic DV and made a fresh cut on test avi.
Encoded result looks ok now.

Thanks to everybody!