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AJA & Avid in Bed
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Hey Rafa,
With the IoHD, ProRes is always used as an intermediate when passing any HD signal to the host computer via FireWire. Other than that, intermediate compression to ProRes is not involved. So for your HD > SD example above then it’s not passing through any ProRes compression along the way. I had a really nice email discourse with Jon Thorn at AJA on all of this a couple of years ago and he was impressively patient with my hopelessly dumb questions as I tried to figure out the various signal paths and how and where the ProRes hardware compression was involved, I thoroughly recommend giving him a shout if you have any concerns at all. Always a pleasure to deal with AJA.
Cheers
Andy -
[Rafael Amador] “I expect AJA clearly stating that “all the internal process is done on Prores”. and every input is automatically converted to Prores. Just like that.”
I see where you are coming from now and I think something is getting lost in translation as the literature does say this, it’s just not in as few words. Hopefully, I can clarify.
The internal signal processing is done uncompressed, but when the signal is prepared for FCP and wrapped to Quicktime/sent to FCP, it is then encoded to ProRes in hardware. Putting the ioHD in stand alone mode is totally different than capturing and encoding video for an NLE. Stand alone mode is simply hardware ‘passthrough’. The signal comes in to hardware and gets converted/processed spit back out through AJA hardware. That side of the ioHD works in standard uncompressed video and doesn’t touch ProRes as there’s really not a lot of encoding/decoding, just signal processing.
It when you add FCP to the mix, that’s when ProRes comes in to play. The encoding/decoding of ProRes to/from Quicktime and the actual processing of the video from the baseband video ports are two separate functions.
Jeremy
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Hi Andy & Jeremy,
That was my idea.
I think that that kind of basic information should be clear on the specs of any pro system.
Cheers,
rafael
PS: I swear I’m not a “discussing-for-all” guy.
I need answers; and answers that match my poor base-knowledge.
If they do not match, then there is something wrong on the answer, or on my base-knowledge.
Something to fix; so I start with my questions and discussions again.
No other way to learn 🙂
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