v4l2 capture has stability issue with high frame rate?

Hi Jun,

To get stable v4l2 capture, please download the latest EZSDK -

http://software-dl.ti.com/dsps/dsps_public_sw/ezsdk/latest/index_FDS.html

and apply the attached patches 5633.v4l2_patches.zipon the linux kernel that is part of the EZSDK before building it.

-Prashant.

Hi Prashant,

Thanks for your notice on this matter.

I will try your patches and will let you know how it goes.

Regards,

Jun

Hi Prashant,

I tried the patches but got no luck to make it work.

Could you please take it look of folowing thread? I copy the error messages there.

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/186252.aspx

Regards,

Jun

Hi, Prashant.

Regarding those patches, i think i found one bug. In the file board-ti8148evm.c function "int vps_ti814x_set_tvp7002_filter(enum fvid2_standard standard)" should return zero for non-negative return value of i2c_transfer call as for the 8168 devices.

Without this function vidioc_query_dv_preset in the file ti81xxvin_main.c fails with those patches.

Best Regards,

Alexander Vasiljev.

Hi Alex

Did you try the patches? Can you right now capture 1080p@60?

I tried but after applying patches none of my gstreamer pipeline having v4l2src works.

Regards,

Jun

Hi Jun.

I have applied these patches and i can capture video stream. But i use only 720p.

And i don't use gstreamer as of now, but slightly modified saLoopBackFbdev.

Best regards,

Alexander Vasiljev.

Hi Alex,

Thanks for your info very much.

I noticed for the low resolution, the capture seems okay.

I am running another thread here, and if you also meet any similar problems regarding v4l2 capture, you are very much welcome to join in the discussion

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/186252.aspx

Regards,

Jun

Hi Prashant,

Prashant Nandakumar said:

To get stable v4l2 capture, please download the latest EZSDK -

http://software-dl.ti.com/dsps/dsps_public_sw/ezsdk/latest/index_FDS.html

and apply the attached patches 5633.v4l2_patches.zipon the linux kernel that is part of the EZSDK before building it.

In this post (http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/335733.aspx) I attempt to fix a couple of calls to mutex_unlock that were never reached because they were after a return statement, from patch 0002-TI81xx-Video-Proxy-Same-containers-are-used-for-Queu.patch in the 5633.v4l2_patches you shared.

Regards,