Change #286609

Comments

lavu/vulkan: wait for the frame timeline before the export layout transition
switch_layout() submits vkCmdPipelineBarrier2 on the compute queue. The
image was last written by vkCmdDecodeVideoKHR on the video queue, which
signals the frame timeline at VK_PIPELINE_STAGE_2_VIDEO_DECODE_BIT_KHR.
The layout transition is a write, and the cross-queue order is that
semaphore wait. VK_PIPELINE_STAGE_2_NONE names no stage, so the barrier
was outside the wait and raced VK_ACCESS_2_VIDEO_DECODE_WRITE_BIT_KHR
(SYNC-HAZARD-WRITE-AFTER-WRITE). Wait at
VK_PIPELINE_STAGE_2_ALL_COMMANDS_BIT so every command in the submission,
including the transition, happens after the signal.

Changed files

• libavutil/hwcontext_vulkan.c