How does DM8168 capture and encode video which source is framebuffer with Gstreamer capture pipelines?

Jed ZHU

Other Parts Discussed in Thread: TVP7002

Hi experts,

We would capture and encode video from framebuffer (such as the blend of /fb0 and /fb1) with Gstreamer pipelines.

How should we do? like this:

gst-launch v4l2src always-copy=false queue-size=12 num-buffers=2000 ! 'video/x-raw-yuv-strided,format=(fourcc)NV12,width=1280,height=720,framerate=(fraction)60/1' ! omxbufferalloc numBuffers=12 ! omx_h264enc bitrate=5000000 ! gstperf ! filesink location=v4l2cap.h264

But we want to use framebuffer instead of v4l2.

Thanks in advance.

Jed ZHU

over 13 years ago

0 HardikShah over 13 years ago

TI__Mastermind 20245 points

Hi,

Framebuffer doesn't support YUV data. It supports only RGB data. While encode/decode supports only YUV data. Any specific reason for using framebuffer instead of V4L2?

Regards,

Hardik Shah

0 Jed ZHU over 13 years ago in reply to HardikShah

Intellectual 815 points

Hi Hardik Shah,

Thanks for your reply.

We want to record the UI operation to H.264 video for specific purpose (as tutorial).

How to implement? Is it possible to convert the RGB data of framebuffer to YUV data and put it into V4L2 buffer, then encode the YUV data with GStreamer pipelines?

Best regards,

Jed ZHU

0 HardikShah over 13 years ago in reply to Jed ZHU

TI__Mastermind 20245 points

Hi,

Now I am able to understand your use case. You can feed in RGB to VIP. VIP can internally convert it to YUV and put it to memory. This YUV can be fed to encoder and V4L2 display driver using gstreamer. Do this suffice your usecase?

Regards,

Hardik Shah

0 Jed ZHU over 13 years ago in reply to HardikShah

Intellectual 815 points

Hi Hardik Shah,

Thanks.

What is VIP? is it VICP?

Could you please tell me the detailed implementation of converting RGB data to YUV and feed it to encoder and v4l2 driver using GStreamer?

Best regards,

Jed ZHU

0 HardikShah over 13 years ago in reply to Jed ZHU

TI__Mastermind 20245 points

Hi,

VIP is video input port. Which is used to capture data from external world like camera or DVD player or PC input.

Regards,

Hardik Shah

0 Jed ZHU over 13 years ago in reply to HardikShah

Intellectual 815 points

Hi,

Do you mean loopback the output of DVO2 (VOUT0) to the input of VIP physically?

And would you please explain the detailed steps?

Thank you in advance.

Best regards,

Jed ZHU

0 HardikShah over 13 years ago in reply to Jed ZHU

TI__Mastermind 20245 points

No,

What I meant was pump the data through VIP using external signal decoder like TVP7002. It can take RGB in. VIP will output YUV out to memory after doing color space conversion. Display YUV data using display driver and/or pass that data to encoder for h.264 encoding.

Regards,

Hardik Shah

Processors

Processors forum

How does DM8168 capture and encode video which source is framebuffer with Gstreamer capture pipelines?