topic Re: cannot been deinterlaced with i.MX8MQ in i.MX Processors

cannot been deinterlaced with i.MX8MQ

zetfan — Fri, 31 Jan 2025 01:17:33 GMT

Hello.

I am trying to play H.264 and MPEG2 interlaced video using a hardware decoder with i.MX8MQ,

but the displayed video has not been deinterlaced.

The decoder library log is as follows,

and the output format is progressive.

VideoDecoderBase: New format(pixelfmt=0x103, min buffers=3, request buffers 6, w*h=1440 x 1088, crop=(0 0 1440 1080), interlaced 0)

My questions are:

1. Does the imx8mq VPU not have the ability to deinterlace during decoding?

2. If so, why is the video being output as progressive?

The environment is as follows:

OS: Android 11.0.0

Player: VLC for android 3.1.7

Re: cannot been deinterlaced with i.MX8MQ

Bio_TICFSL — Tue, 04 Feb 2025 14:27:00 GMT

Hello,

For H1 encoder IP, which can support interlaced video according to the reference manual, but for VPU API, which couldn't handle interlaced video on encoding, but decoder api does.

regards

Re: cannot been deinterlaced with i.MX8MQ

zetfan — Tue, 18 Feb 2025 01:57:53 GMT

Hello Bio_TICFSL,

I am currently using the imx-vpuwrap library,

but is it possible to perform deinterlacing?

Also, can I check if deinterlacing is enabled from a CPU register?

Thank you.

Re: cannot been deinterlaced with i.MX8MQ

Bio_TICFSL — Tue, 18 Feb 2025 14:10:11 GMT

Hi,

The VPUWrap library does not support deinterlaced video, as mentioned before just the API does but you have to change the code.

Regards

Re: cannot been deinterlaced with i.MX8MQ

zetfan — Tue, 18 Feb 2025 23:45:30 GMT

Hi,

Can you please tell me what changes are needed to the VPUWrap library to enable deinterlacing?

Re: cannot been deinterlaced with i.MX8MQ

zetfan — Wed, 26 Feb 2025 01:13:52 GMT

@Bio_TICFSL

Hi,

What is the status regarding the changes required to the VPUWrap library to deinterlace?

Could you please let me know what the changes required are?

Re: cannot been deinterlaced with i.MX8MQ

Bio_TICFSL — Wed, 26 Feb 2025 16:21:59 GMT

Hello,

You need to change the file utils and try to change the VpuScanAvccFrameNalNu, I think also the datasize, of course this is going to be part of VPUAPI.

Regards

Re: cannot been deinterlaced with i.MX8MQ

zetfan — Thu, 27 Feb 2025 05:30:22 GMT

Hi,

Why doesn't the VPUWrap library implement interlace detection?

Was there a risk of performance degradation or anything like that?

Thank you.

Re: cannot been deinterlaced with i.MX8MQ

zetfan — Wed, 05 Mar 2025 10:36:17 GMT

Hi,

I believe deinterlacing is done by setting bAllowFieldDBP to true and using the buffer in the VPU,

but now two frames are displayed one above the other.

Are there any additional changes I need to make?

Thank you.

Re: cannot been deinterlaced with i.MX8MQ

Bio_TICFSL — Wed, 05 Mar 2025 16:13:07 GMT

No, Form the point of view of VPU.

regards

Re: cannot been deinterlaced with i.MX8MQ

zetfan — Wed, 12 Mar 2025 10:04:21 GMT

Does the software deinterlace the two frames output from the VPU?

Thank you.