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This is from what little I've learned over the years.
The codex’s used for rendering and playback and the frame rate will all make a difference. Also note that PAL movies have a different inherent frame rate that NTSC (Never The Same Color) so a movie rendered in a PAL codex at the inherent frame rate of 25.000 frames per second may playback differently on a machine/codex using the NTSC playback rate of 29.970 frames per second.
Also, most of the better programs allow you to reduce the frame rate when rendering to get the file size down - playback in another program using a different codex may result in an incorrect playback time.
AVI files are even more non-standard that WMV and MPG
And I do as HC-Majick, I always add 2 extra videos to every video we render for our affiliates – twelve 12-second videos=144 seconds or maybe not…….
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