So I just noticed that when Plex is doing a full library scan, if I’m watching something and it’s transcoding, the pre-buffer would stop, i.e., it grinds transcoding to a halt. When the scan is complete transcoding returns back to normal. I’ve been reading the forum posts related to this and can’t really find anything that fixed my problem.
I’m on Debian 12, latest plex beta version 1.40.2.8312. Using HW transcoding with RTX 4070 TI. I also have a large music library. The transcode is 1080p 24mbps. The media drives are running ZFS with SSD metadata special devices.
I’ve looked at the plex logs, the debian syslogs, and monitored disk and system activity whenever it happens and as it happens. But don’t see anything out of the ordinary. I’ve tried disabling HW transcoding, and also tried using different drives as the plex temp transcode directory. It’s still consistently reproducible. I’ve also tried setting scanner tasks to lower priority.
This problem probably isn’t noticeable for small libraries because a full scan may only take a few seconds. But I have a large library, and a full scan can take 2-5 minutes. That may not seem like a long time, but when you’re watching something and it pauses to buffer for 2-5 minutes, that’s a long time.
Any suggestions? I’ve reduced the full disk scan to once a day and turned on Automatically Scan (partial changes) for now.
