TDA4AL-Q1: Does v4l2h264enc support Constant Rate Factor?

user4836286

Part Number: TDA4AL-Q1

Hello
Does v4l2h264enc support Constant Rate Factor?
If so, please let me know how to set CRF value in gstreamer. I'm using Processor SDK Linux for J721s2 09_01_00.
Best regards,
Wilson

over 1 year ago

0 Sarabesh Srinivasan over 1 year ago

TI__Genius 17050 points

Hi Wilson,

Yes, v4l2h264enc does support setting the bitrate. You can do this with the following example command and controls that sets the bitrate to 20mbps with a demo pattern ball video:

gst-launch-1.0 videotestsrc pattern=ball num-buffers=5000 ! video/x-raw, format=NV12, width=852, height=480, framerate=30/1 ! v4l2h264enc extra-controls="enc,frame_level_rate_control_enable=1,video_bitrate_mode=1,video_bitrate=20000000" ! h264parse ! filesink location=/test_streams/demo20mbps.264

Thank you,
Sarabesh S

0 user4836286 over 1 year ago in reply to Sarabesh Srinivasan

Expert 1300 points

Hi Sarabesh,

Could you provide a setting equivalent to CRF(or CQ) level 18?
As far as I know, CRF is a bitrate control mechanism. I doubt sole bitrate setting can give equivalent result.

Best regards,

Wilson

0 Sarabesh Srinivasan over 1 year ago in reply to user4836286

TI__Genius 17050 points

Hi Wilson,

I do not think there is a supported control in our driver for CRF. We have an open query with our IP Vendor on whether this is supported by the hardware or firmware. I will update you when I have more information.

Thank you,
Sarabesh S

+1 Sarabesh Srinivasan over 1 year ago in reply to Sarabesh Srinivasan

TI__Genius 17050 points

Hi Wilson,

The VPU's encoder hardware does not support CRF.

Thank you,
Sarabesh S

0 user4836286 over 1 year ago in reply to Sarabesh Srinivasan

Expert 1300 points

Hi Sarabesh,

Thanks for confirming.

Best regards,

Wilson

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TDA4AL-Q1: Does v4l2h264enc support Constant Rate Factor?