i.MX ProcessorsのトピックRe: V4L2 based video scale down application for imx6q

V4L2 based video scale down application for imx6q

jemish_1990 — Wed, 17 Feb 2016 07:33:32 GMT

Hi All,

We have two requirements.

1. Is it possible to capture custom resolutions (example : 480x 272 ) by imx6q?

2. In second requirement we are able to capture NTSC (720 X 480) video in imx6q . Now is there any v4l2 based application available to scale down video to custom resolution (example 480x272).

Please let me know if any of the option is possible.

Thanks,

Jemish

Re: V4L2 based video scale down application for imx6q

igorpadykov — Wed, 17 Feb 2016 09:47:08 GMT

Hi Jemish

one can look at unit test examples, read doc folder in ../test/mxc_v4l2_test/

http://downloads.yoctoproject.org/mirror/sources/imx-test-5.2.tar.gz

it is also described in attached Linux Manual sect.6.4.2 Video4Linux API test

resize examples in:

https://community.freescale.com/docs/DOC-94961

Best regards

igor

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Re: V4L2 based video scale down application for imx6q

jemish_1990 — Wed, 17 Feb 2016 10:32:03 GMT

Hi Igor,

Thanks a lot for your suggestion!

We made it working as of now by doing few changes in sample application we were using.

We can close this thread as of now. If needed I will open new thread.

Once again thank a lot for your suggestions.

Thanks,

Jemish

Re: V4L2 based video scale down application for imx6q

jemish_1990 — Thu, 18 Feb 2016 10:08:50 GMT

Hi Igor,

One quick question if I am using

Below API for scale down.

VIDIOC_S_CROP

How can we confirm whether it is using hw scaler (IPU) or ARM cpu?

Thanks,

Jemish

Re: V4L2 based video scale down application for imx6q

igorpadykov — Thu, 18 Feb 2016 11:44:43 GMT

Hi Jemish

one can look at attached Linux Manual sect.9.2 V4L2 Capture Device

shows used VIDIOC.

Best regards

igor

Re: V4L2 based video scale down application for imx6q

jemish_1990 — Tue, 29 Mar 2016 05:26:37 GMT

Hi Igor,

I have read the suggested document but it nowhere confirming whether it is using hardware scaler(IPU) or ARM (CPU).

Would you please confirm ?

Thanks,

Jemish

Re: V4L2 based video scale down application for imx6q

igorpadykov — Tue, 29 Mar 2016 07:10:00 GMT

Hi Jemish

please look at resize examples

GitHub - rogeriorps/v4l2-examples: V4L2 example codes for i.MX5 and i.MX6 families

~igor