The decompressor for fourcc dvsd is apparently missing. The FAQ doesn't answer this.

[tlevine]

Here is my script:
avisource("tape2.avi")
I tape2.avi plays fine, I only call avisource once, and GSpot says I have the codec, so the frequently asked question regarding this (http://avisynth.org/mediawiki/FAQ_common_errors#When_frameserving_I_got_the_following_message:_.22AVISource:_couldn.27t_locate_a_decompressor_for_fourcc_.28....29.22.3F) doesn't help.

Someone else seems to have had a very similar problem (http://www.moviecodec.com/topics/267p1.html). It doesn't seem that he got it working, but I tried installing the Canopus DV codec anyway, and I still get the same error.

[yup]

tlevine!
Try Directshowsource instead AVISource. May be You not install vfw codec for DV.
yup.

[tlevine]

tlevine!
Try Directshowsource instead AVISource. May be You not install vfw codec for DV.
yup.yup!
nope!
That didn't work either.

[Manao]

Install FFDShow (a recent version, not the 4 years old one...), launch the FFShow's vfw configuration, go to the decoder tab, codecs, and enable DV decoding.

[IanB]

@tlevine,

Please quote the exact error message text if none of the guesses above help.

[yup]

tlevine!
Try Cedocida DV copdec, during install this codec remove before installed DV codec.
http://forum.doom9.org/showthread.php?t=94458
May be Your problem related with software which add DV codec to system?
Also read about Type 1 and Type 2 DV AVI files
http://www.microsoft.com/whdc/archive/dvavi.mspx
yup.

[tlevine]

I learned that the video was encoded with Pinnacle Liquid 7, then I searched and found this (http://forum.doom9.org/archive/index.php/t-64535.html). I'll try that first, then I'll try what was just suggested in this thread.