ср, 25 февр. 2026 г., 19:29 Terje J. Hanssen via Cin <cin@lists.cinelerra-gg.org>:

On 25/02/2026 14:09, Andrea paz wrote:

Andrea, could you add that to the hardware performance section in Latex for the Manual if you have time?

To add Vulkan to the manual, I would need some clarification.

Decoding:
1- Is the “vulkan” setting in Preferences --> performance only valid for amdgpu?
2- Is there a need for libplacebo and certain environmental variables? Which ones?
3- Is there anything else about vulkan that should be included in the manual?

Encoding:
4- Are presets with Vulkan hardware agnostic? (Apart from Intel with problems in ANV).
5- Is there a need for libplacebo and certain environmental variables? Which ones?
6- Is there anything else about vulkan that should be included in the manual? 

This is  more some topic comments, and I hope someone else can clarify your specific questions above.

Via FFMpeg we have

ffmpeg -hide_banner -hwaccels
Hardware acceleration methods:
vdpau
cuda
vaapi
qsv
drm
vulkan

Generic I think the open source methods vaapi, qsv and vulkan should get equal treatement in the manual. 

As known Vulkan is seemingly still in progress, immature and more or less experimental.  Especial the Mesa ANV driver for Intel has reported video encoding issues during more than a year. Hopefully it will be fixed not far into the future
https://www.phoronix.com/news/Mesa-26.1-devel-ANV-H265-Encode

Else, selecting or switching between dual GPU or Hybrid GPU could get a section in the manual..

Whole section? ;)

Aren't CIN_DRM_ENC/CIN_DRM_DEC already documented?

In addition for a computer with dual graphics cards, you can select your specific device
with an environment variable to decode and encode. For example:
CIN_DRM_DEC=/dev/dri/renderD129 CIN_DRM_ENC=/dev/dri/renderD128 ./cin

-----------

I was not aware of the “vulkan” setting in Preferences --> performance or which capability they are meant to offer.

Therefore I just tried to set "Use HW Device: vulkan" (Intel SkyLake) and tested vulkan rendering with h264_vulkan_8b420.mp4

Set the usual environment variable 
export ANV_DEBUG="video-decode,video-encode"

and launched Andrew's appimage Cinelerra Infinity - built: Feb 12 2026 02:45:04

The extra output I noticed was

Decoder mpeg2video does not support device type vulkan.
HW device init failed, using SW decode.
file:/home/terje/Videoklipp/hdv09_04.m2t
  err: Operation not permitted

Yeah, no mpeg2 love here ;)

Try h264/h265 encoded input file?

And the Red color still lacks on the rendered video.

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