Long term reference support for AVC/HEVC
@Djuffin is already working on this.
Since May 14, 2024.
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Description
Long term reference picture marking and control is very useful to cope with frame lost in video conferencing, to avoid asking key frames that typically generates a large frame.
On Windows LTR marking is through three properties if HMFT is used:
https://learn.microsoft.com/en-us/windows/win32/medfound/codecapi-avencvideouseltrframe
https://learn.microsoft.com/en-us/windows/win32/medfound/codecapi-avencvideomarkltrframe
https://learn.microsoft.com/en-us/windows/win32/medfound/codecapi-avencvideoltrbuffercontrol
On Mac/iOS:
https://developer.apple.com/documentation/videotoolbox/kvtcompressionpropertykey_enableltr
https://developer.apple.com/documentation/videotoolbox/kvtencodeframeoptionkey_forceltrrefresh
https://developer.apple.com/documentation/videotoolbox/kvtsampleattachmentkey_requireltracknowledgementtoken
https://developer.apple.com/documentation/videotoolbox/kvtencodeframeoptionkey_acknowledgedltrtokens
It is expected AVC/HEVC codec registration defines VideoEncoderEncodeOptionsForAvc and VideoEncoderEncodeOptionsForHevc with the LTR marking/refresh control added.
Can we add this?
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