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Christophe Gisquet c7e14a279f dnxhddec: use dequantization formula from specs

The current one, while correct, does not yield the best possible
results. The specificiations suggest another formula, which results
in quality gains in the decoded output from fate tests. This
justifies changing said formula.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

2015-10-02 18:08:36 +02:00

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 b305b03708e905717b42fc0b304367d4 *tests/data/fate/vsynth_lena-dnxhd-720p-rd.dnxhd
 2293760 tests/data/fate/vsynth_lena-dnxhd-720p-rd.dnxhd
 3793391df8448937b17d876b6df0d26d *tests/data/fate/vsynth_lena-dnxhd-720p-rd.out.rawvideo
 stddev:    1.31 PSNR: 45.75 MAXDIFF:   22 bytes:  7603200/   760320