Linux/TMS320DM8148: V4l2 Video frame goes back and forth

hideki yamada

Tool/software: Linux

Hi,

Analog video output and streaming delivery (H264) are simultaneously executed as a result of image processing by inputting camera video (NTSC).
At this time, a problem occurred.
Images that appear before and after the output video frame are now output. (Attachment)
Is there a case like this?

Board configuration
CAM → FPGA (Interlace to Progressive) → CPU (814x) → MONITOR (HDD Recorder)

SDK: EZSDKv5.05.02.00
Streaming: using OpenMax

Regards,

Hideki

over 7 years ago

0 RonB over 7 years ago

TI__Mastermind 30986 points

Hideki,

Thanks for your post. I'm sorry, our expert in this area is out for a few days and will reply next week. I apologize for the delay.

0 Margarita Gashova over 7 years ago

TI__Guru* 80190 points

Hello,

Please refer the below thread:
e2e.ti.com/.../186865
There you could find v4l2 patches.

I would recommend you to check this link regarding DM814x:
e2e.ti.com/.../660422

Hope this helps.

Best Regards,
Margarita

0 hideki yamada over 7 years ago in reply to Margarita Gashova

Prodigy 120 points

Hi Margarita,

Thank you for your reply.
After that, I have investigated and found out.
It was found that reading the date from the RTC and changing it repeatedly would reproduce it.
Does V4L2 capture driver relate to system time change?

0 Margarita Gashova over 7 years ago in reply to hideki yamada

TI__Guru* 80190 points

Hello,

No.

Best Regards,
Margarita

0 hideki yamada over 7 years ago in reply to hideki yamada

Prodigy 120 points

Hi

It seems strange that V4L2 asynchronously executed video input / output processing and system time synchronous processing (date command).
Solved by exclusive control of video input / output processing and time synchronization processing.

0 Margarita Gashova over 7 years ago in reply to hideki yamada

TI__Guru* 80190 points

Hello Hideki,

I am glad that this issue is solved.
Thank you!

Best Regards,
Margarita

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Linux/TMS320DM8148: V4l2 Video frame goes back and forth