How to get vaapih265dec output as opencv BGR mat?

[jeyp4]

Hello

I am building an application which emulates below command except
'xvimagesink'.

gst-launch-1.0 -v v4l2src  !
'video/x-raw,format=(string)YV12,width=1280,height=720' ! vaapih265enc !
vaapidecode ! xvimagesink


I checked vaapidecode caps through verbose

vaapidecode0.GstPad:src: caps = "video/x-raw\,\ format\=\(string\)I420\,\
width\=\(int\)1280\,\ height\=\(int\)736\,\
interlace-mode\=\(string\)progressive\,\
pixel-aspect-ratio\=\(fraction\)1/1\,\ chroma-site\=\(string\)mpeg2\,\
colorimetry\=\(string\)bt709\,\ framerate\=\(fraction\)25/1"


*What is the efficient way to replace  'xvimagesink' and get the buffer as
opencv BGR mat?*



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[Victor Jaquez]

On Tue, 29 Oct 2019 at 16:57, jeyp4 wrote:
> Hello
>
> I am building an application which emulates below command except
> 'xvimagesink'.
>
> gst-launch-1.0 -v v4l2src  !
> 'video/x-raw,format=(string)YV12,width=1280,height=720' ! vaapih265enc !
> vaapidecode ! xvimagesink

vaapidecode doesn't exist anymore. Are using gstreamer-1.8?

>
>
> I checked vaapidecode caps through verbose
>
> vaapidecode0.GstPad:src: caps = "video/x-raw\,\ format\=\(string\)I420\,\
> width\=\(int\)1280\,\ height\=\(int\)736\,\
> interlace-mode\=\(string\)progressive\,\
> pixel-aspect-ratio\=\(fraction\)1/1\,\ chroma-site\=\(string\)mpeg2\,\
> colorimetry\=\(string\)bt709\,\ framerate\=\(fraction\)25/1"
>
>
> *What is the efficient way to replace  'xvimagesink' and get the buffer as
> opencv BGR mat?*

You would need vaapipostproc to do the color transformation and set the BGR
format.

>
>
>
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[jeyp4]

I tried vaapipostproc for I420 -> BGRx.

It is working. But costs an overhead of ~5ms for 720p.

I was wondering that both

vaapidecode

 and

vaapih265dec

 offer

video/x-raw(meta:GstVideoGLTextureUploadMeta)

 format: { RGBA, BGRA }.

Can I use this option and to get ready-made BGRA data for cv::Mat? If Yes, then How?



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[Stephenwei]

 format              : The forced output pixel format
                        flags: 可讀, 可寫
                        Enum "GstVideoFormat" Default: 1, "encoded"
                           (0): unknown          - GST_VIDEO_FORMAT_UNKNOWN
                           (1): encoded          - GST_VIDEO_FORMAT_ENCODED
                           (2): i420             - GST_VIDEO_FORMAT_I420
                           (3): yv12             - GST_VIDEO_FORMAT_YV12
                           (4): yuy2             - GST_VIDEO_FORMAT_YUY2
                           (5): uyvy             - GST_VIDEO_FORMAT_UYVY
                           (6): ayuv             - GST_VIDEO_FORMAT_AYUV
                           (7): rgbx             - GST_VIDEO_FORMAT_RGBx
                           (8): bgrx             - GST_VIDEO_FORMAT_BGRx
                           (9): xrgb             - GST_VIDEO_FORMAT_xRGB
                           (10): xbgr             - GST_VIDEO_FORMAT_xBGR
                           (11): rgba             - GST_VIDEO_FORMAT_RGBA
                           (12): bgra             - GST_VIDEO_FORMAT_BGRA




-----
GStreamer is a convenient multimedia platform, I like it.
Develop the NVR system on ARM/x86(c/python)
Use python to generate NVR is crazy, of course works fine.

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[Victor Jaquez]

On Mon, 30 Dec 2019 at 06:33, jeyp4 wrote:
> I tried vaapipostproc for I420 -> BGRx.
>
> It is working. But cost an overhead of 5ms for 720p.
>
> I was wondering that both vaapidecode and vaapih265dec offers
> video/x-raw(meta:GstVideoGLTextureUploadMeta) format: { RGBA, BGRA }.

I suggest you not using it, since that caps feature is going to be deprecated en
2.0. Also that format is just to be used for GL textures, not raw frames. And
the output differs from the used platform: EGL or GLX.

>
> Can I use this option and to get ready-made BGRA data for cv::Mat? If Yes,
> then How?
>
>
>
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