Video Playback broken on lower end AMD Devices in Versions > 7.2

vvvv gamma bug
1

On smaller AMD Devices i noticed some Problems with Video playback.

Background blooms, Edges glow, movement leaves pixel trails.

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image1920×1055 195 KB

Tested on:
Geekom A8 Max
AMD Ryzen 7 8745HS with Radeon 780M
Win 11 Pro Tested with 25H2 and 24H2, current drivers.

Happens on all Versions > 7.2 with Stride & Skia (& ffmpeg)
Tested with the help patch.

Testfile is here (but works with every h264 i tested): https://files.bildwerk.tv/dvdscreensavermaker-1080p-300-188480.mp4

Remote access to the testmachine would be possible.

2

No issues here with my oldschool AMD Ryzen 7 Pro 5850U.

Did you try updating the driver?

Edit:
The AMD Ryzen 7 8745HS seems to be a “china only model” not sure if this can cause problems with drivers not coming from the manufacturer.

3

Tried with the drivers from the vendor and the latest from amd. Same behaviour.

The machine where i noticed it on the project had an AMD Ryzen 5 7430U.
I’ll look for some other pcs to test in the meantime.

Edit:
Just also tested with an AMD Ryzen 7 7840U with Radeon 780M - same issue
Edit2:
Another Test on an older (not updated) Windows Surface with an Intel N200 gives troubles with 7.4, random white flashes and glitches while 7.1 plays fine.

4

Any difference if you play around with the “Prefer Push” and “Prefer Gpu” on the VideoSourceToImage/Texture nodes?

5

prefer gpu off fixed it on all devices, what changed to that toggle between 7.2 and 7.3?

6

We will need to investigate what caused this regression.

7

We were able to reproduce your issue on one of our devices. Culprit was a colorspace related change in 7.3 which in turn lead to a change to the video nodes using RGBA16F texture formats instead of RGBA8 int formats to save a texture copy needed for srgb/linear conversion. In upcoming the system will again use the RGBA8 formats with the copy and optionally allow (via a new pin) to use the float formats without the copy.