Fix Wayland VA-API capture of DMA-BUF frames - #43
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Sep 8, 2026
Adapt PR #43 with explicit encoder backend metadata and PipeWire default buffer-pool policy. The VA path forces a fresh VAMemory surface before any retaining stage and preserves the shared timestamped encoder suffix.
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Wayland capture on Intel Lunar Lake fails on current main (
ae06722) when usingvah264enc. The pipeline emits one small initial frame, then exits withvapostproc: Invalid caps video/x-raw(memory:DMABuf)and a PipeWire internal stream error.This adds a VA-API capture path that imports the portal buffers directly and keeps conversion, scaling and encoding in VA memory.
vapostprocproduces a separate NV12 surface, so downstream elements do not retain another portal buffer. PipeWire keepalives supply idle frames, andvideoratelimits the output rate. The shared encoding and timestamp-preserving output remain unchanged.The source caps also specify square pixels. Without that constraint, this setup negotiated a pixel aspect ratio of
1/2147483647, which preventedvapostprocfrom calculating the borders needed to preserve the desktop's proportions.Validation:
go test ./...passes, including regression coverage for the VA pipeline, receiver dimensions and shared output.This validation covers local capture and encoding. Verified working on a Samsung AU9000 in conjunction with PR #44, Other VA-API drivers have not been tested.