Hello,I have a CAnnon HV20 with an HDMI output. I am wanting to capture live video into my imac. How do I hook the camera to the computer?
-Can I use just a regular HDMI cable with a thunderbolt adapter?
-Do I need an expensive video conversion box of some type (please say no)?
I am running a video mixing program called vmix. www.vmix.com.au. I have been able to capture the video through the firewire output on the camera into the thunderbolt but the quality is low. I am hoping I can get a higher quality into my computer through the HDMI
Any help is hugely appreciated.
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Sorry, but you do need an OSX-compatible HDMI capture device. The Blackmagic Intensity Shuttle for Thunderbolt and Blackmagic Intensity Extreme are the only Thunderbolt-based capture devices I have seen. There are also a couple of USB 2.0 HDMI capture devices that are a little less expensive and OSX compatible, the elgato Game Capture HD and the Hauppauge HD PVR-2.
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The Firewire output is anamorphic 1440x1080i 25Mbps MPEG-2 (HDV) unless you changed the settings. That's not generally regarded as low quality.
How about attaching a sample video to show us what you are looking at? -
Hi ,
Thanks for the reply. Question: will this work?
http://www.bhphotovideo.com/c/product/892453-REG/Blackmagic_Design_bdlkulsdzminrec_Ult..._Recorder.html
Thanks -
I don't know enough about your iMac, or the capture device and capture software to say. Reviewers seem more pleased with the Blackmagic Design UltraStudio Mini Recorder Capture Device for SDI capture than for HDMI capture. I suspect you'd get uncompressed HDMI input through your thunderbolt port that would have to be compressed using software. Compression options would depend on your CPU and capture software. Files could be very large, on the order of 100GB/hr, for lightly compressed HD video. High compression of HD video in real time requires a beefy CPU.
I'd try to work with vaporeon800 first to see if it is possible to improve the quality of the video received via firewire to an acceptable level.Last edited by usually_quiet; 14th Nov 2013 at 14:19.
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The capture software will determine your options for compression. vaporeon800 would know better than I would which compression options will work with your CPU for 1920x1080 video. He has a Windows PC with a similar CPU and more experience with HD capture devices that use software compression.
From what I recall compressed ProRes would be the standard capture format for OSX using the Media Express software included with that device. Coming from the PC side, I am at a disadvantage since ProRes is Apple only, but I think CPU demands will be within the capabilities of your iMac, but file size will be enormous, much larger than for H.264 which seems to be preferred by many people these days.
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