AW: Plane address mismatch of vaapi video buffer

[Thornton, Keith]

This is probably an alignment problem. Your stepsize is probably 1088 long because it must be divisible by 16.

-----Ursprüngliche Nachricht-----
Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] Im Auftrag von Thomas Scheuermann
Gesendet: Montag, 22. Februar 2016 13:42
An: gstreamer-devel at lists.freedesktop.org
Betreff: Plane address mismatch of vaapi video buffer

Hi all,

I use a pipeline which which uses vaapidecode and vaapipostproc for a video and the frames are delivered to appsink. I keep the NV12 format.
Outside the pipeline I get the sample from where I want to access the video frame. I use the following code to get access:

buffer = gst_sample_get_buffer(_sample); caps = gst_sample_get_caps(_sample); gst_video_frame_map(&frame, &vinfo, buffer, GST_MAP_READ)

Now I should be able to access the video planes via frame.data[0] for the Y plane and frame.data[1] for the UV plane.

This works for a video with e.g. 1280x720. But if I use a video of
1920x1080 the Y plane is still correct but the UV plane is shifted for some lines and starts later as in data[1].

The strides should be in
vinfo.stride[0]
vinfo.stride[1]

but they also dont match.

How can I get the correct addresses of the planes?
Do I have to set something special if I use a VAAPI generetad buffer?
How do I get the correct stride of the planes?

I use GStreamer 1.4.5 at the moment.

Regards,

Thomas
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