[IanB]

"rgb32, 804x80" That is the shape of an error message clip.

You are between a rock and a hard place. You need to see the text of that error message to proceed.

Maybe something like this will help you move forward

Try {
  v = DirectShowSource("video.grf", audio=false, fps=25, framecount=4000).ConvertToYV12
  a = DirectShowSource("sound.grf", video=false, fps=25, framecount=4000)
  AudioDub(a,v)
}
Catch(err_msg) {
  WriteFileStart("log.txt", err_msg)

# or perhaps

#  BlankClip(100, 804, 80, pixel_type="YV12")
#  Subtitle(err_msg)
}