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deinterlacer with same frame-rate in input&output

ranchu
Guru 20755 points

Hello,

I would like to ask about deinterlacer:

Does anyone knows what it means if input and output rate is configured the same value in deinterlacer, which is supposed to work in deintralce mode (interlace->progressive).

I have an issue where fast camera movements are displayed in jumps in the display, so on changing parameters, I notices that when dei input frame rate is configured same value as output frame rate, then the behaviour is much better,

Regards,

Ran

  • 0
    TI__Guru**** 496655 points
    The frame rate of input is not for conversion from interlaced to progressive or the otherway. It is for dropping the input/output frames to get the required frame rate at input/output. If you dont want to drop it, keep the frame rate same for input and output.
    Rgds,Brijesh
  • 0 in reply to Brijesh Jadav
    Guru 20755 points

    Hi Brijesh,

    Thanks for the answer, But I don't fully understand this:

    If both input&output frame-rate is 60fps, does it mean that the progressive output is 60fps ?
    How can that be (60fps input is interlaced) ?

    Regards,

    Ran

  • 0 in reply to ranchu
    TI__Guru**** 496655 points
    Hi Ran,
    Conversion from Interleaced to progressive or other way is controlled using different create time parameters.
    Frame rate parameters are just used for frame dropping, like for the 60 inputs frames/fields, how many frames/fields will be the output?
    Rgds,Brijesh
  • 0 in reply to Brijesh Jadav
    Guru 20755 points

    Hi Brijesh,

    Thank you very much for the time.

    I understand that dropping is not done if both input and output frame is the same, and that configuring dei mode is done using a different parameter.

    The question I trying to ask in this thread, is what the difference in dei video frame output between configuration #1 and configuration #2:

    configuration #1:
    dei.input frame rate = 60
    dei.output frame rate = 60
    dei mode = interlace to pregressive

    configuration #2:
    dei.input frame rate = 60
    dei.output frame rate = 30
    dei mode = interlace to pregressive

    I know that video format output of DEI  in configuration #2 is: 30 fps progressive.

    What will be  DEI video format output for in configuration #1 , i.e. Is it 30fps progressive/60fps progressive/something else ?

    Thank you,

    Ran

  • 0 in reply to ranchu
    Guru 20755 points

    Hi Brijesh,

    I think I understand now.
    If I do no drop , then I should expect it to be 60fps progressive , Right ? I was somehow believed that for conversion of progressive from interlaced there should always be divide in 2 by frame-rate, but I understand now that probably that assumption is wrong, and there are several method for onversion interlaced->progressive.
    Therefore, if dei output rate is 60fps, it probably make sense now that the video is more robust to fast camera movements. I wander why this is not the default  setting for  the demo.

    Thanks,
    Ran

  • 0 in reply to ranchu
    TI__Guru**** 496655 points

    Hi Ran,

     

    Yes, if your input is 60 fields(if DEI is enabled) or frames(if DEI is bypassed), you get 60fps progressive output.

     

    Rgds,

    Brijesh