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Summary
DescriptionLabradorescence in labradorite.webm
English: A short video of a sample of labradorite in a mineral shop in Madrid, New Mexico. As the viewing angle changes, the sample becomes much more visibly iridescent.
Taken with a Nexus 5X; converted with ffmpeg 3.1.1-static (Lavc57.48.101 for libvpx-vp9 and libopus) with two passes: ffmpeg -i VID_20170316_114332.mp4 -c:v libvpx-vp9 -pass 1 -b:v 16897k -crf 23 -threads 8 -speed 4 -tile-columns 6 -frame-parallel 1 -an -f webm /dev/null, followed by ffmpeg -i VID_20170316_114332.mp4 -c:v libvpx-vp9 -pass 2 -b:v 16897k -crf 23 -threads 8 -tile-columns 6 -frame-parallel 1 -an -auto-alt-ref 1 -lag-in-frames 25 -f webm "Labradorescence in labradorite.webm" as described in the WebM Project's encoding guide under "constrained quality".
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