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Here are my settings for backup to BD25 with recompression :
for movies : speed vs quality (preset) : slower, tune : film and --merange 24 as additional parameter. Video bitrate is generally calculated between 14000 and 20000
for animations : speed vs quality : slower, tune : animation, --merange 24 --bframes 3 --ref 4 and --trellis 0 as additional parameters.
Tune animation introduces higher bframes number and higher ref number (with preset slower) and I suspect it is not compatible with Bluray Spec (not tested). I correct it with --brames 3 and --ref 4.
In both cases, the result is perfect. Impossible to see any difference with the original BD even using the pause function and freezing frames
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