Playback Speed

kmiller6116

Is it just me or does adjusting the playback speed not work well after like 1.3x depending on video quality? It gets very choppy and i have to turn it down

ibins

If you increase playback speed you increase the load of the system. After all you have to decode the video at least with the factor you increase the speed faster.

There might be a point where your system can not decode or render the video fast enough to keep up with the increased speed.

kmiller6116

ibins yea i figured that but non vr 1080p videos i can do 4x fine so i just thought maybe it would be possible to pull out only the n frames that need to be used and render those. Maybe that's not how the streams work though. Im on a quest 2 with a 800 Mbps Ethernet so maybe it's just the quest.

ibins

kmiller6116

kmiller6116 yea i figured that but non vr 1080p videos i can do 4x fine

That is equivalent to 4k 1x

kmiller6116 so i just thought maybe it would be possible to pull out only the n frames that need to be used and render those.

This is not possible, at least not in the decoding stage.
Video encoding gets so high reductions in size by only storing a whole frame occasionally and only store the differences for the frames in between.
With B-Frames it gets even more complicated as the frames can depend on both temporal directions, and to get back the original frames you have to decode each frame.

kmiller6116

ibins Thanks that makes sense. I was actually briefed on the theory 10+ years ago but I was at a higher level analyzing metadata from UAV streams so I never used it.