Virtual Dub problem

[rocka]

I am new to using Virtual Dub and I am trying to use it for editing a DVB-T stream as described here: https://forum.videohelp.com/topic356036.html
Problem is that any file I feed into Virtual Dub, it only loads the first 920 frames (about 35 seconds) or so of the video... (even if the recorded .ts file is 2 hours long). I am just wondering if it's something very basic I am missing or if it has something to do with the format of the file (MPEG4, H264).
Here is the avisynth script I am using:

vid=DirectShowSource("J:\test.ts",fps=25,convertfps=true,audio=false) 
aud=wavsource("j:\test.wav") 
aud=DelayAudio(aud,.1007) 
audiodub(vid,aud) 
Load_Stdcall_Plugin("C:\Program Files\AviSynth 2.5\plugins\yadif.dll") 
Yadif(order=1) #top field first 
Crop(10,2,-8,0) 
LanczosResize(720,576) 
Trim(150,1072)

[gadgetguy]

Trim(150, 1072)

Do you understand what Trim means?

[jagabo]

Trim(150,1072): throw away frames 0 to 149. Keep frames 150 to 1072. Throw away any frames after frame 1072.

[rocka]

OK, thanks very much for the reply. I am still a noob at scripts and that line totally slipped my mind.