V4L2 driver overlay capabilities

Hi,

Overlay is not supported. You can use graphics driver to do blending or color keying between graphics and display.

Regards,

Hardik Shah

Hi Hardik,

Looks like it is supported. Please correct me, if I misunderstood anything.

I am referring to http://processors.wiki.ti.com/index.php/DM816X_C6A816X_AM389X_VPSS_Video_Driver_User_Guide_PSP_04.00.00.11

It stats: "Support colorkeying on video pipeline through V4L"

Without overlay how color key is possible?

Regards,

Krunal

Hi,

By definition video overlay means

"Video overlay devices have the ability to genlock (TV-)video into the (VGA-)video signal of a graphics card, or to store captured images directly in video memory of a graphics card, typically with clipping. This can be considerable more efficient than capturing images and displaying them by other means. In the old days when only nuclear power plants needed cooling towers this used to be the only way to put live video into a window."

source

Which is not supported. But  as i told in my earlier reply Alpha blending and color keying is supported.

Hardik,

Thanks for the clarification.!

Regards,

Krunal

Thanks Hardik for your quick response.

However, I am not sure, if I am clear on it.

Could you please elaborate or provide me some reference / point to some sample code on how to achieve video position change using graphics driver in Dm8148?

Thanks and

Kindest Regards,

Salim

Hi,

Can you please let me know what exactly you want to do between audio and video.

Regards,

Hardik Shah

Sorry my mistake

Video and Graphics?

Regards,

Hardik Shah

Hi Hardik,

I wish to change the position (x, y) and size (width, height) of video window.

Graphics plan will have its transparency set so that video could be seen through HMI at desired position in the display.

Kindest Regards,

Salim

Hi,

Position you can change using the overlay mechanism, but for changing the size you need to use VFPC component to resize it to different resolution. By default if image is of smaller resolution than display resolution, image is centered.

Regards,

Hardik Shah

Hi Hardik,

I have already manages to change the resolution of video by working on GStreamer. What I wanted was to define / change window size within which video can be displayed.

Is there a reference or sample code available to show how to change the position and window size?

Kindest Regarsd, Post

Salim

Hi,

I think we have gstreamer implementation where change in position is done using overlay and change in size is done using VFPC. Let me forward your mail to concerned people here.

Regards,

Hardik Shah

Thanks Hardik,

I am using Gstreamer with V4l2 sink and V4L2 driver for media playback. My understanding was that position change can be achieved by setting properties of V4L2 sink, but it did not work too.

So, if you can help me get connected with right person who provides some workable solution, that would be great.

Kindest Regards,

Salim