Khronos Releases AV1 Decode in Vulkan Video with SDK Support for H.264/H.265

Re:Khronos Releases AV1 Decode in Vulkan Video with SDK Supp... by cm2187 on Friday February 02, 2024 @05:54AM (#39227278)

Maybe I am doing it wrong. But I tried the following commands to test it on h264/h265 and 1080p/4k sources:

  Soft: ffmpeg -i {src}  -map 0:v -f null - 
  Hard: ffmpeg -hwaccel cuda -i {src}  -map 0:v -f null -

the result I get is:

  Source       Hard  Soft
  1080p-h264  25.1x 37.1x
  1080p-h265  26.4x 36.5x
  4k-h264      5.5x  7.1x
  4k-h265      5.5x  6.5x

this is on an old CPU (i7-6700K) and a somewhat recent GPU (RTX 2060) and with ffmpeg 6

[ Parent | on HN ]

Re:Khronos Releases AV1 Decode in Vulkan Video with SDK Supp... by fisf on Friday February 02, 2024 @08:19AM (#39228199)

I am pretty sure that does not activate the hardware encoder. https://trac.ffmpeg.org/wiki/HWAccelIntro

[ Parent | on HN ]

Re:Khronos Releases AV1 Decode in Vulkan Video with SDK Supp... by cm2187 on Friday February 02, 2024 @08:44AM (#39228441)

We are talking about decoding here. You meant decoder? I can certainly see the hardware decoder being busy in task manager.

[ Parent | on HN ]

Re:Khronos Releases AV1 Decode in Vulkan Video with SDK Supp... by snnn on Friday February 02, 2024 @11:54PM (#39237637)

I think you should use nvdec instead of cuda. GPU itself is not a hardware decoder, the special decoder unit inside of it is.

[ Parent | on HN ]

Re:Khronos Releases AV1 Decode in Vulkan Video with SDK Supp... by jasonjmcghee on Friday February 02, 2024 @11:37AM (#39230715)

I barely know what I'm talking about, but in my experience to use software I had to explicitly enable it with "-allow_sw" but this may have only been necessary due to videotoolbox

[ Parent | on HN ]

Re:Khronos Releases AV1 Decode in Vulkan Video with SDK Supp... by akvadrako on Saturday February 03, 2024 @01:17AM (#39237980)

Cuda is not a normal hardware decoding API. Look for VA-API and VDPAU.

[ Parent | on HN ]

Re:Khronos Releases AV1 Decode in Vulkan Video with SDK Supp... by bdhcuidbebe on Sunday February 04, 2024 @07:36AM (#39249751)

You are using cuda for some reason? cuda is for general gpu computing, not the same as using the dedicated hardware enc/dec engines.

See ffmpeg docs for the hw decoding name, like nvdec iirc for nvidia cards.

[ Parent | on HN ]