WEBM is the codec name, and VP9 is the encoder (the older encoder "VP8" is less efficient than VP9). WEBM/VP9 and h.264 both have options to control the file size versus compression time (e.g. fast but big, or slow and small, for the same output quality). Since WEBM/VP9 only has three choices, I've chosen to map those to 3 of the 9 possible choices of h.264: - BEST → SLOWER - GOOD → MEDIUM - REALTIME → SUPERFAST The VERYSLOW and ULTRAFAST options give very little extra benefit. Reviewed by: @Severin
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18 KiB