TMPGEnc seriously over-estimates file length!

OK, if your problem is that you loaded a 90 minute file (just an example) and TMPGEnc said it was 142 minutes long or something, then this is what to do.

Click setting and click the advanced tab. Select Source Range from the list and if it doesnt pop up, double click source range. Click "move to start frame" and click "set start frame" then click "move to end frame" and click "set end frame". Then click OK and try again!