Vulkan HEVC encode still have color space limitation?

[alatteri]

Hello,

I'm wondering if Vulkan HEVC encode added in FFMPEG 7.1 would still have the color space limitation that Intel QSV does? And does UG even support Vulkan encode?

Thanks,
Alan

[MartinPulec]

I'm wondering if Vulkan HEVC encode added in FFMPEG 7.1 would still have the color space limitation that Intel QSV does?

You mean enforcing BT.601 YCbCr conversion? I don't know exactly, I'd suppose since at least part of the restrictions is inside the media-driver, so I guess that it will be similar. But I am not 100% sure about it - IIRC some of the problem was querying the color space from the driver... but I cannot rule out that it is somehow possible to request eg. that we don't want the color-space conversion at all. So unfortunately I don't have so deep insight to tell for sure.

I've unfortunately not managed to get the Vulkan encode queue (VK_KHR_video_encode_queue) to on Intel Arc. But if you look at reported capabilities (eg. for A770) it is rather a sad story - it seems rather that encode is not yet supported for Intel devices in Linux?

And does UG even support Vulkan encode?

Unfortunately not yet - FFmpeg implements Vulkan encoders with only input format Vulkan surface so it doesn't work right away even though the encoder is present in UG Linux build - we'd need to add some routines (relates to hwupload needed by FFmpeg CLI).

[alatteri]

Thanks for the update.