[MPlayer-users] PSNR Questions
Ian
the.pond at dsl.pipex.com
Sat Feb 15 19:17:02 CET 2003
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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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