Video Scaling Issue

jason xu

I output live video by video2 layer and I need scaling it. I develop it as the following sequence:

Stream Off
Set Crop Size
Set Display Size
Stream On

But I found the video blinks once. Tn fact, the screen turns to black when the video is "stream off" at fist step and then restores with new "crop/display size" at last step. But I think that is unacceptable for the end user. So how can I avoid the blink? Is there any good experience to solve this? Thanks.

over 14 years ago

0 Brijesh Jadav over 14 years ago

TI__Guru**** 477705 points

Hi,

StreamOff stops the video port and StreamOn starts again video port. So you are seeing blank frame in between. V4L2 standard does not allow changing scaling parameters at runtime, so this is the only way to change the parameters.

Thanks,

Brijesh Jadav

0 jason xu over 14 years ago in reply to Brijesh Jadav

Prodigy 90 points

Hi,

Thank you very much for the feedback. It is disappointed for me that we need scale the video by multi-touch gesture (Pinch). It means the video will blink continously while pinching the video.

Best Regards.

0 HardikShah over 14 years ago in reply to jason xu

TI__Mastermind 20245 points

Yes,

That is true but it is a limitation of V4L2 framework and not the hardware.

Regards,

Hardik Shah

0 jason xu over 14 years ago in reply to HardikShah

Prodigy 90 points

Got it, thank you very much.

Best Regards.

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Video Scaling Issue