How to detect transcoded video

[juanemma]

Not sure if "transcode" is the correct word, but what I mean is:

How do you detect when a dvd has been sourced from a vcd or xvid?

I searched the forum and coudnt find the answer, sorry if it has been answered before.

Thanks a lot.

[retired]

http://www.thetradersden.org/forums/faq.php?faq=video#faq_video_stats

[pawel]

In most cases by your eyes only. Usually these two sources will give you a blocky video, even encoding rate is over 5000 kbps.

[juanemma]

Thanks for the answers.

[KoolKat]

....edit