AviSynth script causing mpeg output to "stutter"?

[spon23]

I've posted about this problem in the "newbie conversion" section and wasn't able to get a resolution, but I think that I've narrowed down the problem to an Editing issue. Hopefully it's ok to post again here.

I've been having problems converting xvid files in CCE using AviSynth scripts. The original files play perfect and VirtualDub shows now errors at all. However, when I convert them the resulting MPEG2 file plays with a constant "stutter", almost like it's pausing on every frame, or even playing only every other frame. It plays the same way on a stand alone DVD player and TV. The source is 23.967 progressive.

I had originally thought it was a problem with my CCE settings so in an effort to make sure that it wasn't my source, I decided to convert the same avi file using TMPGEnc. I did the normal FILM settings that I would use (ie. 23.976 (internal 29.97), 2:3 flag pulldown, ect). The video turned out good. No stutter at all.

I then decided to try the Avisynth script that I was using in CCE, in TMPGEnc. The result- the same stutter problem that I had with CCE! So obviously I either have a problem with the script itself, or for some reason the Avisynth isn't working correctly.

Here is my script (it's very simple):

AVISource("Warriors1.avi",audio=false)
LanczosResize(720,360)
AddBorders(0,60,0,60)
ConvertToYUY2()

Should I try another resizing method? In the hours of reading I've spent trying to figure out this problem, I haven't seen anything at all about their being problems with LanczosResize.

Any thoughts?

Here is my original tread on the problem before I narrowed it down to a AviSynth issue. https://www.videohelp.com/forum/viewtopic.php?t=247492

thanks again for your help.

[feenix]

There doesn't appear to be anything wrong with the script (I don't think you actually need the ConverttoYUY2 parameter, but I don't know CCE). I've used LanczosResize and Lanczos4Resize and never had a problem with either.

Have you tried playing the script in Widows Media Player? As it's not a complicated script it should play OK. If it does then the script isn't the problem.

[spon23]

Feenix- When I play the script in the window, the video plays with the stutter effect that I've described. When I play the avi, it plays perfect.

The best way I can illustrate what I mean by stutter is by watching the end credits of a movie. Instead of smoothly scrolling down the screen as they do in the avi, when I play the script the wording jumps from line to line as it moves up the screen.

[spon23]

In case anyone is following this thread, I wanted to post the solution to my problem. Some suggest to me to change the avisynth scrip as follows

AVIReader=AVISource(filename,audio=false)

with

AVIReader=DirectShowSource(filename,framerate,audi o=false)

I tried it and it works perfectly! Thanks everyone for your help.