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Video with alpha channels?

hi, just wondering what the latest with video and alpha channels in wire cast is..

after doing research all i found was a suggestion to use a the quicktime movie format. it worked but it was very choppy and shuttering which made it unusable. I'm on windows 10 and have x2 GPUs so its clearly a program limitation and not a hardware limitation.

a great work around that some people have suggested to render out you video with a green background and then key that out. 

does anyone know of any other ways to use video with alpha channels in wire cast that's usable??

thanks in advance 

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  • Hi Harvey Miller AO

    I hav e regularly used multiple video elements with alpha channel background that were dynamically composited together. It used to work with older versions of Wirecast... I can't remember when it broke. I've had to pre-render those elements which works, but I no longer have the dynamic layering flexibility that I had previously.

    This bug has been reported. However, there has been no update as to when or if this will be fixed.

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  • Harvey Miller AO said:
    after doing research all i found was a suggestion to use a the quicktime movie format.

     It's not clear which of two Quicktime codecs you may have used.
    There's Animation codec with Alpha and ProRes with Alpha.
    Also make sure you are using Wirecast 13.1.2 (current version) as you don't include the version number.
    Animated GIF with Transparency may also work.

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  • Harvey Miller AO said:
    I'm on windows 10 and have x2 GPUs so its clearly a program limitation and not a hardware limitation.

     That doesn't provide enough information about the hardware. The model CPU and GPU are factors as well. GPU itself may not play much of a role unless you were chroma keying.

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  • We'd need complete specs including specs and the file you are using (codec etc).

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  • Harvey Miller AO  the engineers would like to work on this but they need the above information.

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  • CraigS 

    CraigS said:
    the engineers would like to work on this but they need the above information.

    Craig.

    I've reported these issues, and actually provided video files before... but I never received followup or a bug fix. I've given up, and just rendered the layers into a single file. I had provided the raw files as well about a year and a half ago. I provided raw files in November 2018. These were confirmed to be received. If I recall correctly, you reproduced the bug as well on your machine.

    Ticket 00599679, Jira WIRE-15021

    Is there a reason why this would not be fixed by now?

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  • Greg Kuhnert said:
    WIRE-15021

     Is specific to macOS. The original poster is on Windows.
     

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  • Greg Kuhnert  my own test

    Test
    iMacPro 8 Core
    macOS 10.14.6
    Wirecast 13.1.x
    Facetime camera set to 1080p30
    Encoder Record to disk MP4 x264 4Mbps 1080.
    Recorded for 30 seconds
    CPU use apx 8%
    Added ProRes 4444 w/Alpha 6 second set to loop as overlay
    Recorded for 30 seconds
    CPU use apx 15% (peaked briefly at 19%)

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  • OBS 25.0.8
    Facetime camera set to 1080p30
    Encoder Record to disk MP4 x264 4Mbps 1080.
    Recorded for 30 seconds
    CPU use apx 10%
    Added ProRes 4444 w/Alpha 6 second set to loop as overlay
    Recorded for 30 seconds
    CPU use apx 14% (peaked briefly at 15%)

    Lower peak when recording but the CPU use difference was negligible.
    Otherwise, Wirecast and OBS were comparable using the same ProRes Alpha file on the same machine with similar settings.

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  • Go to the ticket I quoted. The raw overlay files are there. Load was much higher than the numbers you quoted. Totally un-usable, and 18 months since the bug was reported with no feedback.

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  • CraigS said:
    WIRE-15021

    Is specific to macOS. The original poster is on Windows.

    How do you know it is specific to macOS ???

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  • Greg Kuhnert said:
    How do you know it is specific to macOS ???

    We investigate issues as reported. If the reporter is on macOS that's what we investigate unless we get a concurrent report of the same issue on Windows.

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