[MPlayer-users] PSNR Questions

[Ian]

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D Richard Felker III wrote:

> How are you measuring the PSNR of the original?? Like I said, you have
> to use the same reference to compare PSNR.

I've been experimenting with a 3 or 4 pass TV recording method whereby I 
capture at maximum bps for a high-quality "original" mpeg4 or mjpeg, 
then do a 2- or 3-stage reduction to 1Mb/s mpeg4.  I left the PSNR 
option on for both stages and just observed that the figures were higher 
for the low-bw output than the max-bw "original".

Incidentally, the quality of this procedure was not significantly 
(visibly) better than an original grab at the low-bw rate, hence my 
interest in an objective measurement.

I might just recreate some figures, but it will have to wait until 
tomorrow as I'm off out now ;)

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Ian Smith
Worst . . . signature . . . ever !

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