[BUG] Black Screen on HEVC Encode + Software Decoding [--avsw] with RX6700

[Wontell]

Hello,
while encoding HEVC files if i use Software Decoding [--avsw] option instead of Hardware [ --avhw] I get 50% FPS boost in video encoding.

But i get lots of Black Screen crashes mid encoding, driver time out errors, sometimes the PC can recover and AMD Adrenalin generates bug report, otherwise i get "no image" slide on my TV [using OLED as PC monitor] and i have to Hard Reset the PC.

I tried going back from Normal drivers from 22.8.1 back to WHQL 22.5.1, it actually BOOSTED my Encoding [With --avsw ] from 300FPS to 350FPS for FHD videos, but i still got the black screen and driver timeout.
Sometime i can encode 5-10 files no issues and other time it will freeze on same file 2-3 times with recovery, ill re-start encoding and it will freeze again.

I use FastFlix to encode.

Now i came back to Hardware Decoder and so far no black screen/ driver time outs but much MUCH slower performance.

MSI Mech RX6700
12900K
32Gb RAM
RAID0 Samsung Pro for encoding files

[rigaya]

I've tested using RX5500XT and RX460 with 22.8.2, 22.7.1, 22.6.1 driver using --avsw, but cannot find problem there. It might be RX6xxx series specific issue, it'll be difficult, as I don't have RX6xxx series myself.

Looks like the driver is unstable?

[Wontell]

I've tested using RX5500XT and RX460 with 22.8.2, 22.7.1, 22.6.1 driver using --avsw, but cannot find problem there. It might be RX6xxx series specific issue, it'll be difficult, as I don't have RX6xxx series myself.

Looks like the driver is unstable?

Hi,
I resrehced it and its a known issue with HEVC encode on RX6xxx
It happens for people even when they stream, with OBS.
But with your encoder, especially the latest version, i cant encode, i get a black screen 2 seconds after i press encode button, doesnt matter if i use software or hardware Decoder, it happens anyway, but AVC works fine, only HEVC.

[rigaya]

I resrehced it and its a known issue with HEVC encode on RX6xxx
It happens for people even when they stream, with OBS.

If it’s RX6xxx(RDNA2) series specific problem, although it’s weird that VCEEncC runs into black screen, I’ll need to wait till the HEVC encoding to get stable, as I can’t test with RX6xxx series right now.

I’m planning to get Zen4 in the future which is told to have RDNA2 iGPU, I might be able to test at that time.

[Wontell]

I resrehced it and its a known issue with HEVC encode on RX6xxx
It happens for people even when they stream, with OBS.

If it’s RX6xxx(RDNA2) series specific problem, although it’s weird that VCEEncC runs into black screen, I’ll need to wait till the HEVC encoding to get stable, as I can’t test with RX6xxx series right now.

I’m planning to get Zen4 in the future which is told to have RDNA2 iGPU, I might be able to test at that time.

Hello,
Its not just black screen, it disconnects my TV [I get No Input picture on TV]
Unplugging the TV and repluging doesn't help, only hard reset

I think i have to get myself an nvidia GPU as backup and sell the rx6700XT [Interested?], AMD is meh, i had 5950x CPU and moved to 12900K, so much better, no issues.
AMD is full of bugs and problems, be it on CPU and GPU, i have them a chance, now its Intel and Nvidia only.

regards