Jerky playback after file is Inverse Telecined.

[Eldric]

Well, ran into a bit of a problem here and I'm hoping that someone might be able to give me a hint on what to do here. I've been attempting to master (or at least get a handle on) VirtualDub and have been using 1 minute captures from a digital source (digital cable unit) for filter testing. Now, I've been able to get extremely good results when using an AVIsynth script to Inverse Telecine the files, prior to applying the filters. However, I have run into a stubborn file that just REFUSES to playback smoothly after the file is inverse telecined. The playback has a tendency to be jerky at times, in that it seems like a frame either momentarily sticks, or has been removed altogether. I'm not sure if the file is being decimated properly during the Inverse Telecine process. This is the script I've been using:
LoadPlugin("F:\decomb511.dll")
AVISource("F:\capture.avi")
Telecide(Order=1,Guide=1)
Decimate(cycle=5)

Please remember, this is the ONLY file that I've run into that has this problem. The source - or more precisely, the capture is a 1 minute segment of "Big Valley" - an old tv program that's about 35-40 years old and has that peculiar color scheme that you find in several shows of the time, such as Bonanza.

I've tried modifying the script by changing the decimate settings in order to deal with a "Hybrid" piece of film (in case the show was originally captured in another format that was not the usual 24 fps).

LoadPlugin("F:\decomb511.dll")
AVISource("F:\capture.avi")
Telecide(Order=1,Guide=1)
Decimate(mode=3,threshold=2.0)

Unfortunately, while the film plays back a bit smoother than the previous, I now have blurring popping up where frames have been interlaced. In both cases, when I attempt to inverse telecine the clip I use HuffyUV 2.1.1 as the compression codec (and I'm only doing the Video stream in each case), so I'm not sure if this might be causing the jerkiness or how the script is setup.

Any suggestions as to what I can do to Inverse Telecine this clip and not have that jerky playback?

Thanks in advance,
Eldric

[Eldric]

Well, it appears that the jerky playback takes place whenever the camera is panning or following an actor who's in motion. Just to test and see, I did a capture of another show (Bonanza) from roughly the same time period, and I got the same result. It looks like the timing is off on the decimate filter - though why is still a mystery.

Eldric

[SLK001]

You have the field order wrong.

[Eldric]

How would I go about correcting this in the AviSynth script? I'm still a bit new to using AviSynth with VirtualDub and I'm somewhat unfamiliar with using some of the more advanced options/settings in the Telecide/Decimate process.

Eldric