Possible transcoding bug?

Plex Media Server
1

Server Version#: 1.43.2.10687-563d026ea
Player Version#: 4.159.0

Running on TrueNAS SCALE 25.10.3 on a MiniForum N5. GPU is AMD Phoenix / HawkPoint (780M), running the following:

  • VAAPI
  • AVI
  • MPEG4 ASP (XviD)

When watching XviD encoded content on Chrome web client, I get a green-shifted output.

Screenshot 2026-07-10 115451
Screenshot 2026-07-10 1154511920×982 236 KB

If I disable hardware acceleration, the picture returns to normal.

Log contains:

No support for codec mpeg4 profile 15.
Failed setup for format vaapi

But it looks like instead of falling back to software encoding upon that error, it’s just blindly forging ahead and outputting green.

Plex Media Server Logs_2026-07-10_11-47-20.zip (100.5 KB)

2

AMD GPU’s are not supported. Why did you think they were?

3

From: https://support.plex.tv/articles/115002178853-using-hardware-accelerated-streaming/

  • Plex supports automatic fallback from hardware to software. If the hardware video engine fails to decode or encode a video, Plex will seamlessly switch to using software without causing an error.

So if it doesn’t automatically fallback from hardware to software, isn’t that still a “bug” ?

4

I believe what @pl_5309 is saying is that you should not enable hardware acceleration at all with AMD GPUs. If you do, then don’t be surprised if there are issues as it is not a supported configuration.