"David J. Liu" <[EMAIL PROTECTED]> writes:

> The video is a short segment (2 MB) with a few hundred frames.
> http://www.vimatechnologies.com/download/test.mpg
> How can I find out whether a file needs to be demultiplexed?

Use the "file" command:

$ file test.mpg 
test.mpg: MPEG sequence, v1, system multiplex

This file is an MPEG1 system stream, and needs to be demultiplexed.
This is also made apparent by the presence of audio.

-- 
Måns Rullgård
[EMAIL PROTECTED]

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