Bad frame output from Avisynth

[Avisynth_challenged]

Hi. I've been using Avisynth 2.5.6 in conjunction with Virtualdub 1.6.11 to perform IVTC on a video clip.

Here's the script I used:

# These lines call the scripts required for IVTC
Import("C:\program files\avisynth 2.5\plugins\jdl_util.avs")
Import("C:\program files\avisynth 2.5\plugins\jdl_telecine.avs")
############

# This line loads the AVI source
AVISource("Path\source.avi")
############

# This line invokes the IVTC command
JDL_IVTCPattern(0, false) #3:2 pulldown removal for this clip
############

When I looked at the output for this script, there was one frame which had a nasty artifact. I've attached a portion of the video frame which shows the artifact clearly:

http://i252.photobucket.com/albums/hh18/FoolsTalk/glitch.jpg
(The image should be completely black.)

Has anyone ever encountered this type of bad output? I'm wondering if the problem is with Avisynth, Virtualdub, or the jdl_telecine function. Thanks to anyone who reads and/or responds :)

[check]

I'd suspect a telecine issue. Try with another IVTC plugin like TIVTC.

[scharfis_brain]

Looks like an HuffYUV-Compression error to me.

[Avisynth_challenged]

So I figured I put down all the necessary information on the OP, only to get a response that identifies HuffYUV, which is the codec I used to generate the output.

@ scharfis_brain:
I did use HuffYUV (version 2.1.1). Sorry I didn't mention that earlier. So I'm guessing it's an occasional glitch that all HuffYUV 2.1.1 users have to live with, and be on the lookout for?

Thanks again to all :)

[scharfis_brain]

yeah that is an occasional glitch.

try ffdshows internal huffyuv encoder and also ensure that ffvfw decodes it.
Also you may try one of the other lossless encoders of ffdshow

[Avisynth_challenged]

yeah that is an occasional glitch.

try ffdshows internal huffyuv encoder and also ensure that ffvfw decodes it.
Also you may try one of the other lossless encoders of ffdshow

I already captured directly to HuffYUV 2.1.1 (with VirtualVCR). Would you recommend I recap with ffdshow's internal HuffYUV encoder? Thanks for your help!