topic Re: How to use VPU to encode/decode on imx8qxp (linux) in i.MX Processors

How to use VPU to encode/decode on imx8qxp (linux)

wasim_nazir — Sun, 05 Jul 2020 16:16:05 GMT

Hi Guys,

I am currently using imx-L4.14.98_2.3.0 linux yocto build on imx8qxp-B0.

I need to create one application to encode/decode h264.

Is there any user-guide to implement enc-dec on Amphion VPU.

I am following this doc(https://www.nxp.com/docs/en/reference-manual/IMX_VPU_APPLICATION_PROGRAMMING_INTERFACE_LINUX_REFERENCE_MANUAL.pdf ), which shows way for programming based on RPC but doesn't seems complete.

I have also found end/dec test applications here(imx-test - i.MX Driver Test Application Software )

Is there any other proper doc or sample code to follow, to implement the same.

Thanks in Advance,

Regards,

Wasim

Re: How to use VPU to encode/decode on imx8qxp (linux)

igorpadykov — Sun, 05 Jul 2020 23:18:56 GMT

Hi Wasim

I am afraid such nxp publicly available documentation is not available yet,

one can look at third party resources:

MX8 GSTREAMER - Variscite Wiki

GStreamer Based Image Signal Processor - IMX8 Pipelines

Best regards
igor
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Re: How to use VPU to encode/decode on imx8qxp (linux)

fmonte — Mon, 06 Jul 2020 09:40:03 GMT

Hi Wasim,

on 8QM we are using the NXP's gst v4l2decoder to decode H264 frames using the VPU. That's working fine.

The missing part is the display of the decoded Amphion tiled format, that's not included in the gstreamer provided with BSP 4.14.98

Francesco

Re: How to use VPU to encode/decode on imx8qxp (linux)

wasim_nazir — Tue, 07 Jul 2020 09:54:31 GMT

Thanks a lot for your response.

How to make sure it is using hw-codec and not the sw-codec?

Regards,

Wasim

Re: How to use VPU to encode/decode on imx8qxp (linux)

fmonte — Thu, 16 Jul 2020 08:58:46 GMT

If using HW decoding, in dmesg you will find messages stating that the VPU is opened, the buffers allocated etc.