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Old 11th February 2019, 22:29   #1466  |  Link
benwaggoner
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Join Date: Jan 2006
Location: Portland, OR
Posts: 4,750
Quote:
Originally Posted by Blue_MiSfit View Post
^ DRM is absolutely positively mandatory - no two ways about it. You simply will not get the rights to distribute content if you don't have approved DRM implementations, and this is extremely specific e.g hardware implementations of PlayReady, Widevine with progressive restrictions to unlock HD or UHD content.
Yeah. It is table stakes for anything that isn't piracy or user-generated content. If AV1 matters outside of social networks, it'll be because it gets 1st class DRM support, which requires HW decoders and other deep SoC integration. Weird little SoC DRM design decisions have kept a lot of amazing things from happening.

Quote:
Maybe viewing through the ultra low bitrate lens, has anyone done very low bitrate 2 pass VBR tests with AV1? I'd be interested to see how that might fit into the above scenario regarding downloading content for offline playback. This is a neat scenario because you get the bonus of being able to skip all the compromises one must make when encoding for adaptive bitrate delivery and can use very large buffers (vbv-maxrate + vbv-bufsize) and longer adaptive keyframe intervals.
It's not so much a long buffer window, but having a maxrate>>bitrate. Maxrate and bufsize can be kept at the profile @ level maximums while ABR can be way way lower. Doing maximum 10 sec Open GOP is pretty reasonable.

I worry that AV1's interframe CABAC dependencies will impair random access enough to make the practical maximum GOP duration a lot smaller. Some of that could probably be addressed via encoder tweaks, at the loss of a little efficiency.
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