They didn’t explicitly say but it sounds like the JPEG solution can’t put out a substantial FPS. If you start to do fancier stuff like sending partial screenshots or deltas only then you get the same issues as H264 (you miss a keyframe and things start to degrade). Also if you try and put out 30 JPEGs per second you could start to get TCP queuing (i.e. can’t see screenshot 31 until screenshot 30 is complete). UDP might have made this into a full replacement but as they said sometimes it’s blocked.
They didn’t explicitly say but it sounds like the JPEG solution can’t put out a substantial FPS. If you start to do fancier stuff like sending partial screenshots or deltas only then you get the same issues as H264 (you miss a keyframe and things start to degrade). Also if you try and put out 30 JPEGs per second you could start to get TCP queuing (i.e. can’t see screenshot 31 until screenshot 30 is complete). UDP might have made this into a full replacement but as they said sometimes it’s blocked.