High CPU usage when extracting I-frames from an RTSP stream

[BartButenaers]

@krambriw

One additional observation when using "-vsync", "0" or "-r", "1" is that the latter one gives many more messages at the output of the ffmpeg-spawn node

Yes indeed that was something that I also didn't understand in the beginning. But in one of the above posts I have tried to explain why that happens.

@krambriw

Maybe fps_mode is as good as vsync?

If I understood correctly fps_mode is the successor of vsync. The vsync is obsolete and will be removed in the future. In the ffmpeg docs you can see that you can even pass the old vsync numeric values to the new fps_mode parameter if you like:

But you can also pass the new string values ('passthrough', 'cf', 'vfr', ...) to the new fps_mode parameter... They should offer the same behaviour.

[krambriw]

@BartButenaers

They should offer the same behaviour

Yes, but since you have it working, maybe you can check when you find time(slot)?

And BTW, it seems the same image is sent multiple times when using r option

[krambriw]

@BartButenaers

I have tried to explain why that happens

Oh yes, I see now, it is copying the same by design. So means if you just want one sngle copy, use vsync (or maybe fps_mode)