Intel 11700K QuickSync slower to transcode than software. Jellyfin works fine

[craigmdennis]

Server Version#: 1.25.0.5220 (currently beta)
Player Version#: 4.66.1 (Web)
Intel i7 11700K
Unraid 6.9.2

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Running the beta 1.25.0.5220 and there are no artefacts, hardware transcoding “works” (shows up in the dashboard) and using intel_gpu_top I can see QuickSync working BUT my system actually transcodes faster with it disabled.

Software transcoding: speed = 0.8 to 1.1 (no buffering)

Request: [127.0.0.1:58182 (Loopback)] PUT /video/:/transcode/session/mjz8pan5zqnndu2jnve6vc8o/6cbb871a-7277-4489-8dff-bf785cab2c9a/progress?progress=0.7&size=-22&remaining=8394&vdec_packets=1382&vdec_sw_ok=1364&speed=1.1&vdec_hw_status=0 (9 live) Signed-in Token (craigmdennis) (range: bytes=0-) / Accept => */* / Connection => keep-alive / Host => 127.0.0.1:32400 / Icy-MetaData => 1 / Range => bytes=0- / User-Agent => Lavf/58.65.101 / X-Plex-Http-Pipeline => infinite / X-Plex-Token => xxxxxxxxxxxxxxxxxxxx

Hardware transcoding: speed = 0.5 - 0.8 (buffering every 15-30 seconds or so)

Request: [127.0.0.1:58472 (Loopback)] PUT /video/:/transcode/session/1spr93mn2uvpcmnv05hpkhec/e6d72786-c3fd-45cf-8863-713ec8927a71/progress?progress=0.5&size=-22&remaining=17226&vdec_packets=1006&vdec_hw_ok=988&speed=0.4&vdec_hw_status=1 (9 live) Signed-in Token (craigmdennis) (range: bytes=0-) / Accept => */* / Connection => keep-alive / Host => 127.0.0.1:32400 / Icy-MetaData => 1 / Range => bytes=0- / User-Agent => Lavf/58.65.101 / X-Plex-Http-Pipeline => infinite / X-Plex-Token => xxxxxxxxxxxxxxxxxxxx

Here’s intel_gpu_top running to show there’s plenty of headroom for transcoding.

I installed Jellyfin which worked perfectly. As you can see, the iGPU is being worked much harder:

What information can I provide that would be useful to debug this?

Originally posted in: Plex Media Server 1.24.6.5145 - New Transcoder Preview - #86 by craigmdennis but seems like it might be a broader issue.

[craigmdennis]

After a few server reboots, it seems to be functioning normally. The only thing I changed was the transcode speed from “Ultra” to “Super”, noticed the difference and changed it back to “Ultra” to check if that was still slow and nope; working perfectly.

So if anyone finds this post, suffering from the same, try:

1. Changing the transcode speed
2. Rebooting a bunch