Kris Mcmullin
Forum Replies Created
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We’re not using any type of splitter for audio. We’re coming out of our Blackmagic to a Rolls audio converter (+4 to -10) and directly into our broadcast router (Knox). Interesting thing we noticed last evening while testing for a live broadcast; when we switch our on location JVC HM750U to output HD-SDI to the Blackmagic (over a fiber network in town)- the audio is crystal clear through the Blackmagic path. Unfortunately, the HD-SDI signal distorts every 15 seconds or so (bit rate issue maybe?). We found we couldn’t keep a stable signal with it, but we did have great audio. Dip settings on the box are correct, but we were forced to use SD-SDI into the Blackmagic; which then goes back to giving us that sort of “crackling/static” audio. Wondering if the audio being generated in HD-SDI mode is that ASI that the box refers to (as opposed to Analog), and if it only wants to accept that. This is a tough one to troubleshoot.
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So we got a Rolls +4 to -10 audio converter. We also purchased brand new 1/4″ to XLR balanced cables. No luck unfortunately, we’re still stuck with a crackling/static signal. We’ve emailed Blackmagic to see if they suspect that it may be the box. Wish we knew for sure, however, where the distortion was coming from. We tried to run RCA audio directly from our JVC HM750U camera into our Knox- with no distortion at all. Then we tried putting the Blackmagic back in the mix and it was partially distorted again. We know we’re using the right cables, but we’re just not able to trace where this distortion is coming from.
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Thanks! We certainly will be taking the Knox out of the mix as we move towards a better configuration. Unfortunately, our Cable providers will not support an HD-SD SDI signal, so we are stuck broadcasting Public Access as SD 4:3. In terms of the Blackmagic Box and Converter; thank you again for helping us with this issue. I just wanted to be a bit more specific as to the nature of the distortion- so as to get a better confirmation of the +4db and -10db issue. We’ve since made the move to purchase the audio converter, and are hopeful that this will solve things. Much thanks again!
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Thanks Bob for the quick response. Sounds like we will have to be careful with our choice of 1/4″ to XLR for the convertor. Thanks again for your help!
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Ahh! That makes sense. I’ll be picking one up tomorrow to try it and hopefully it will work. Thanks so much for the quick response Dave!
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Thanks Dave. I connected my JVC camera via usb. I did not have a IEEE cable available. When I plugged it into the camera and then into the usb port, FCP X did not recognize anything. I went into the Import from Camera setting and all I saw was the web cam listed. I’m wondering if there is a setting within FCP or even on the Mac Book that would help FC find the camera. Either that, or I have to have that IEEE cable to interface to the Mac Book.
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As always, thanks Floh for the great support. We changed the pre-roll in Device Control and it picked up at the correct time. We’re hoping to continue reacquiring thanks to your suggestions!
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Thanks Gregg. It looks like everything matches up. Do you guys know what the red TIMECODE message means when it chimes upon first starting to try to acquire through the batch window? Thanks
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Thanks Joe. I’ll give it a shot. I’m still worried that I might be missing something in my pref’s, but I’ll try it out. Thanks!
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I decided to move on to another reel to try and make some progress on my Batch Reacquire. Now I find that, when I put in my tape and select the clip I need to reacquire, my deck cues up to find the clip but then loses sync. I have checked my deck settings, and they are still the same that I’ve used to acquire- I have no issues acquiring footage directly into the edit suite. I just can’t figure out why it won’t reacquire the footage without losing sync.