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  1. Originally Posted by jagabo View Post
    Originally Posted by Blackout View Post
    so if capture interlaced 25fps = 50 fields, then it stands to reason that capture of interlaced i50 = also double = 100 fields surely?
    The term 50i doesn't mean 100 fields per second. It's simply a new name for 25i, 50 fields per second. One company started marketing with the new name because people think bigger numbers are better. Other had to follow or risk losing sales. 25i and 50i are exactly the same thing.
    damn jagabo. You have just turned my world upside down! This is the most important post ive read in years and changes everything. Thank you for explaining it to me. its fairly cruel for this to be the situation. Just adds another curve in the understanding of this whole process.

    Best Regards,
    Blackout
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  2. Originally Posted by Blackout View Post
    The Blackmagic company is based in Port Melbourne, Melbourne Australia. Its literally around the corner from me, about a 5 minute drive. This new box updowncross HD is a very new product. Theres no manual online that i could find for it. Im going to give them a phone call this week and see if i can get an answer out of them re:de-interlacing. ill post back with the result
    ok I gave Blackmagic a call and had a really nice chat with a guy named Darrell.


    he came up with some answers for the new Updowncross HD that are not in the manual. The email response was forwarded to me from the Product Manager.

    my question was specifically in regards to what happens when the unit is converting from 1080i50 to 1080p50:

    A: "It’s de-interlaced to 1080p25 so no loss of fields and then doubled to 1080p50. "

    My second question was "if its therefore de-interlacing, what method is it using?"

    A: "In this case we are basically doubling the number of fields so you could call it “Progressive Scan”.....engineering say that the method used for the Updowncross HD in this instance would be closest to "Weave""

    this is a really interesting product! Darrell tells me its flying off the shelves and they cant keep up with production, there is over 1 month backlog at the moment for stock. Im not surprised. Its a hardware box that deinterlaces using TERANEX algorithms for $200 bucks.

    it does sound like the video is going to be jumpy tho? its dropped from 50 fields/second to 25fps. that causes jittery scrolling I would have thought?
    Last edited by Blackout; 14th May 2018 at 20:15.
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  3. Member
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    Originally Posted by Blackout View Post
    Originally Posted by Blackout View Post
    The Blackmagic company is based in Port Melbourne, Melbourne Australia. Its literally around the corner from me, about a 5 minute drive. This new box updowncross HD is a very new product. Theres no manual online that i could find for it. Im going to give them a phone call this week and see if i can get an answer out of them re:de-interlacing. ill post back with the result
    ok I gave Blackmagic a call and had a really nice chat with a guy named Darrell.


    he came up with some answers for the new Updowncross HD that are not in the manual. The email response was forwarded to me from the Product Manager.

    my question was specifically in regards to what happens when the unit is converting from 1080i50 to 1080p50:

    A: "It’s de-interlaced to 1080p25 so no loss of fields and then doubled to 1080p50. "

    My second question was "if its therefore de-interlacing, what method is it using?"

    A: "In this case we are basically doubling the number of fields so you could call it “Progressive Scan”.....engineering say that the method used for the Updowncross HD in this instance would be closest to "Weave""

    this is a really interesting product! Darrell tells me its flying off the shelves and they cant keep up with production, there is over 1 month backlog at the moment for stock. Im not surprised. Its a hardware box that deinterlaces using TERANEX algorithms for $200 bucks.

    it does sound like the video is going to be jumpy tho? its dropped from 50 fields/second to 25fps. that causes jittery scrolling I would have thought?
    If the Blackmagic Updowncross HD weaves both interlaced fields together to create a progessive frame and duplicates that frame to produce 1080p50, then for any programming that is televised live, like sports, you will see combing artifacts during motion as well as motion that is less smooth than the original. I would not recommend it.
    Ignore list: hello_hello, tried, TechLord
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  4. Yeah, that reply from BlackMagic makes no sense.
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  5. usually that's exactly what I suspect as well...artifacts and lack of smooth video. Plus... I agree jagabo that it makes no sense.

    It was in an email in writing from them too...its not like I translated it wrong over the phone or something!
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