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Forums AJA Video Systems 5.1 surround sound with I/O?

  • 5.1 surround sound with I/O?

     Morten updated 10 years, 10 months ago 4 Members · 15 Posts
  • Bruce Greene

    April 29, 2010 at 8:35 pm

    I need to project a movie through the I/O HD from my laptop in a theater. Is there a way to output 5.1 surround sound through the I/O box?

    I’d like to use AJA tv to play the quicktime as I keep getting dropped frames playing through FCP.

    Can the surround sound even be included in a quicktime prores file?

    Thanks!

    Varicam/Steadicam Owner
    Los Angeles, CA
    http://www.brucealangreene.com

  • Jeremy Garchow

    April 30, 2010 at 2:14 pm

    You can send the 6 separate channels out of the iohd via the aes bncs, but you’d need a couple of da converters and the unit on the other end would need to be able to understand what those 6 analog channels were, unless the unit can handle Aes audio.

  • Bruce Greene

    April 30, 2010 at 9:08 pm

    Thanks Jeremy. Just checked with the projectionist today and made a test. They are set up to take the AES audio and have their own D/A converter.

    Anything we need to know about making a quicktime with all the tracks?

    Varicam/Steadicam Owner
    Los Angeles, CA
    http://www.brucealangreene.com

  • Jeremy Garchow

    April 30, 2010 at 9:15 pm

    Well, I assume that you have a 5.1 mix already?

    How did you receive it?

    If so, you need to setup the FCP timeline for 6 outputs and assign each track to the appropriate output (you can do this in the audio mixer or on the timeline by right clicking towards the left of the timeline, right by the auto-select boxes and choose the output there). When you export the file, you will have six tracks (you should reimport the export in FCP, just to check as Quicktime won’t tell you just by opening it, you can look at the properties in QT though, and it should show 6 audio tracks).

    You have to make sure you are sending the correct track to the correct output according to the theatre’s AES system. (Left front is track 1, or whatever they need).

    Jeremy

  • Bruce Greene

    April 30, 2010 at 9:22 pm

    The sound is being mixed this week.

    I would like to play from the AJA TV application as FCP is dropping frames on playback.

    Can a single QT clip have all six tracks?

    Varicam/Steadicam Owner
    Los Angeles, CA
    http://www.brucealangreene.com

  • Jeremy Garchow

    April 30, 2010 at 9:56 pm

    [Bruce Greene] “I would like to play from the AJA TV application as FCP is dropping frames on playback. “

    Hmm, you’d have to test with AJA TV. VTR Exchange might be an option. I can run a test in a little while.

    [Bruce Greene] “Can a single QT clip have all six tracks? “

    You got it.

  • Jeremy Garchow

    April 30, 2010 at 10:04 pm

    After checking, VTR Exchange can definitely route the audio as needed.

    I’d go that route vs AJA TV.

    Jeremy

  • Bruce Greene

    May 1, 2010 at 5:05 am

    Thanks again Jeremy.

    Unfortunately, VTR exchange is dropping frames, as is FCP.

    FCP never used to drop frames in this format. I don’t know why it is now. AJA TV application seems to have no trouble playing the files.

    I wonder if there is something weird about the files now that they’ve been rendered in Apple Color to ProRes HQ? Though most of the original files were recorded by the I/O in ProRes HQ, but I never noticed so many dropped frames before.

    For whatever reason AJA TV has no trouble playing the files….

    Varicam/Steadicam Owner
    Los Angeles, CA
    http://www.brucealangreene.com

  • Jeremy Garchow

    May 1, 2010 at 5:51 am

    Tell me more about your system. Like what OS, FCP, drives, etc.

  • gary adcock

    May 1, 2010 at 1:42 pm

    [Bruce Greene] “Unfortunately, VTR exchange is dropping frames, as is FCP. “

    when these app’s are dropping frames your disk drives are Not fast enough to play back your content.

    gary adcock
    Studio37
    HD & Film Consultation
    Post and Production Workflows for the Digitally Inclined
    Chicago, IL

    https://blogs.creativecow.net/24640

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