I used all default values, chose /media/my FAT32 partition on SD card in left slot/rec.mkv, and started recording, with the hotkey set to CTRL+SHIFT+R, and stopped after ~15 seconds.
UI feedback: The counter HH:MM:SS increases normally, also current FPS are updated, but the filesize remains at 0.
I assume SSR is not recording in contrast to your demo video. Otherwise it would have to use a temporary storage location (where? videos are large!), and write to disk only later on.
Then upon pressing save, the program stays unresponsive forever (max CPU load). I have to force quit it.
What could have gone wrong?
Or are there any undocumented requirements (partition setup, minimum free disk space, OS version, shared libraries)?
Help appreciated!