Server Version#: 1.41.0.8992 Player Version#: 4.138.0 It appears today’s update has broken VC1 transcoding. Direct play appears to work on mobile though begins to buffer endlessly when transcoding. Setting it down to 720p and below appears to begin playback though. Turning on subtitles makes it su…

See PMS Release Notes: Plex Media Server - #651 by gbooker02

[image] ThePrower: 12700K Intel dropped support for hardware accelerated decoding of VC1 video starting with the 11th gen CPUs. However, it should decode VC1 quite easily using the CPU. What happens if you disable hardware accelerated transcoding? From the Intel datasheet for 12th gen Co…

Yep. It plays when disabling hardware-accelerated video encoding. At this point I presume there is no way for it to automatically switch to CPU when hardware-accelerated encoding is enabled then.

You left “Use hardware acceleration when available” enabled? Could you upload the log files from that test?

Sure. So when leaving both on, at least on chrome browser, it stalls. [1] When turning off “Use hardware-accelerated video encoding”, and leaving on “Use hardware acceleration when available”, it does transcode and plays properly. [2] Here are the logs with “Use hardware-accelerated video encodi…

In theory, Plex should see that it is not compatable with the hardware side and start transcoding on the software side correct? Is this a bug or am I just misunderstanding?

“Intel dropped support for hardware accelerated decoding of VC1 video starting with the 11th gen CPUs.” This is inaccurate information. VC1 hardware decoding is supported through the 14th generation. Going forward (starting with Arc cards) it will not be supported. The latest version of PMS broke…

Just to confirm things, I rolled back to 1.40.5.8897 with hardware-accelerated video encoding enabled. No issues with playback. [image] I feel pretty confident to say this is a bug at this point.

To confirm, today’s beta release 1.41.0.8994-f2c27da23 does not fix the issue.

@ThePrower thank you for reporting. I’ve collected your logs and observations into an internal issue.

I also ran into this issue a few days ago. Thought a Windows update maybe broke something because it used to transcode just fine. What I wanna know is: if one decides to upgrade to a 15th gen or Intel Arc GPU, is hardware encoding still possible? Meaning software decode and hardware encode, or is t…

Recent update breaks VC1 transcoding

Plex Media Server

Topic		Replies	Views
PMS Crashes when Transcoding VC1 Source Files with Hardware Acceleration Enabled "Playback Error - An unexpected playback problem occurred" Plex Media Server server-linux , server-unraid	21	373	March 14, 2022
VC1 Transcoding Broken [Again] Plex Media Server server-windows	2	140	April 7, 2026
VC1 Hardware Decoding Fails Plex Media Server server-windows	2	159	September 14, 2025
Plex 1.25: hardware transcoding not working on old intel CPUs with Windows 10 Plex Media Server server-windows	5	157	April 24, 2022
Use hardware-accelerated video encoding got broken with the latest update Plex Media Server server-unraid	29	1003	June 1, 2023

Recent update breaks VC1 transcoding

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