Originally posted by: DVD-BOY
I've notice that everything I've used the AVISynth script with has got the number of frames and therefore the running time completely wrong - like in the region of 16 hours!!

I'm not really doing anything 'funky', just:

DirectShowSource(howard.ts)
AssumeFPS(23.976)

Any suggestions?

Two suggestions:
Use AVC2AVI to put the H264 stream into an AVI container, and use AVISource(), as described on the previous page.
or
Assuming you are using the latest AVISynth version 2.5.7, use the new framecount parameter to force the correct length, e.g. DirectShowSource( "filename", framecount=<no. of frames> )