Hardware transcoding H265 error

radoo

Hello,
I have recently switched from an Ubuntu machine (i5-3470s) to a Proxmox (Intel N100) setup.
I am running TVheadend version 4.3-2374_g26ec161fb-dirty in a container, passing through the devices for hardware transcoding /dev/dri/renderD128 .
I need transcoding so I opted for hardware transcoding: hevc_vaapi: H.265/HEVC (VAAPI) .
On most of the TV channels it is no problem, everything runs smooth, no errors. But on one channel after some random time, the image is stopped, only audio and subtitle continues.
Logs showed this error when this happens:
2024-11-13 10:56:23.843 libav: AVCodecContext: Failed to upload decode parameters: 18 (invalid parameter). 2024-11-13 10:56:23.843 libav: AVCodecContext: Failed to end picture decode after error: 18 (invalid parameter). 2024-11-13 10:56:23.843 libav: AVCodecContext: hardware accelerator failed to decode first field
Starting again the channel works fine, for a while. I would like to know how can I correct this.
I tried several parameter values for this codec, but nothing helped.

Here is my current config:

And of course the problem with HDHomerun HD tuner locking is present.
Any help is appreciated.

radoo

Details for vaapi:
vainfo: VA-API version: 1.14 (libva 2.12.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 22.3.1 ()

ukn_unknown

I know two options:

Simple --> uncheck the checkbox: Hardware acceleration --> this way you get a SW decoding with HW encoding.
Complicated --> check this thread: https://tvheadend.org/d/8884-vaapi-transcoding-code-refactoring-testers-needed and test the new transcoding branch. My expectation is that vaapi will show the same error ... but you will have the opportunity to test h264_qsv encoder. I recommend you to use look_ahead with number of frames equal to frame rate (25, 30 or 50). Read full thread before starting.
Also is odd that you selecte Scaling mode : Up and Height = 0 (no scaling). Basically the 'Up' has no effect.
Maximum B-frames = 0 is not optimal from bandwidth point of view, Start with 3 and increase up to 7 for best results.

radoo

Thanks for the tips, I will try the new values for the parameters you suggested.
I also saw that thread that you mentioned, I will focus on it.

radoo

Parameter changes didn't helped at all.

ukn_unknown

radoo The error from previous post is reported by hardware decoder, if you uncheck the Hardware acceleration you will use the software decoder. Can you post the error reported (because it cannot be the same error)?

radoo

Hello, you were right, it seems that I forgot to uncheck that checkbox, but as soon as I unchecked it, the error was gone and it works fine. Thank you for helping out.