[REQUEST]: Timestamp for sent/received video frames (pts/dts)

Is your feature request related to a problem?

It would be nice to have some way to synchronize video frames with some other data, e.g. subtitles, transforms, etc. Currently there is no way to figure out what is the frame I'm receiving, they only come in sequence and I can't tell when exactly this frame was rendered.

Describe the solution you'd like

Can we have a callback when the frame goes to ecoder, with its uniques pts or dts? Can we access pts or dts on the receiving side?

Describe alternatives you've considered

I tried to rely on the sequence of frames I'm sending/receiving, but you still can't say if the frame was dropped, and you can't tell when exactly the render texture was accessed and fed to the encoder, because encoder and Unity run at different framerates.

Additional context

No response