[Bug 755072] vaapi: expose memory:DMABuf capsfeature

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755072

--- Comment #26 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to sreerenj from comment #25)

> "v4l2src io-mode=dmabuf-import ! vaapipostrpoc" was the only working
> pipeline when I was testing last time. Now the "v4l2src io-mode=dmabuf " is
> also testable.

In my setup (HSW) only io-mode=dmabuf works. With dmabuf-import this error is
shown:

0:00:03.311454792  9392      0x2494e30 ERROR          v4l2allocator
gstv4l2allocator.c:735:gst_v4l2_allocator_start:<v4l2src0:pool:src:allocator>
error requesting 2 buffers: Invalid argument
0:00:03.311484207  9392      0x2494e30 ERROR         v4l2bufferpool
gstv4l2bufferpool.c:848:gst_v4l2_buffer_pool_start:<v4l2src0:pool:src> we
received 0 buffer from device '/dev/video0', we want at least 2
0:00:03.311494158  9392      0x2494e30 ERROR             bufferpool
gstbufferpool.c:531:gboolean gst_buffer_pool_set_active(GstBufferPool *,
gboolean):<v4l2src0:pool:src> start failed

And this looks to me an error in v4l2, not vaapi.

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