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Picture flicking when playing JPEG pictures

smilexj
Prodigy 190 points

Our product is used dm355 platform and bt656 digital output from dm355 to dpp1500.

 The flicking coming out obviously when playing JPEG pictures.

There is no obvious flicking when playing video signal such as mp4, avi and CVBS.

When output color bar from VPBE, there is no flicking.

Can any one give me some hint how to improve it?

Thanks a lot! 

  • TI__Mastermind 37340 points

    The flickering could be due to one of the following

    1) improperly configured VPBE timing registers; did you make any driver changes?  If not, how are you configuring driver to do BT.656 digital output (bootarg settings, application run-time parameters...)?

    2) User application pin-ponging back and forth between image frames; is your application calling FBIOPAN_DISPLAU ioctl?

  • in reply to Juan Gonzales
    Prodigy 190 points

    Yes, I changed the encoder driver to BT656 encoder.

    There is no FBIOPAN_DISPLAU ioctl be calling by my application.

     

  • in reply to Juan Gonzales
    Prodigy 125 points

    Juan Gonzales said:

    The flickering could be due to one of the following

    1) improperly configured VPBE timing registers; did you make any driver changes?  If not, how are you configuring driver to do BT.656 digital output (bootarg settings, application run-time parameters...)?

    2) User application pin-ponging back and forth between image frames; is your application calling FBIOPAN_DISPLAU ioctl?

    I'm seeing (what i think is) the same problem in my application.  In attempting to work toward a solution I've changed the PBBPR setting to 0x10 which decreases the amount of display flicker but does not remove it completely.  What would you suggest doing since my application DOES make use of the PAN_DISPLAY ioctl? I'm working with a display size of 640x480 and using the dlcd output instead of composite.

     

    -BJ