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> Date: Sun, 27 Jul 2014 08:56:53 -0700 > From: len@xxxxxxxxxxxxx > To: dj_kaza@xxxxxxxxxxx > CC: linux-audio-user@xxxxxxxxxxxxxxxxxxxx > Subject: Re: live video switching? WAS: Re: VJ / VeeJing software alternatives > > On Sat, 26 Jul 2014, Kaza Kore wrote: > > > Not video switching, and if all your video sources are going to be consumer > > products it may be of no interest to you, but the BBC has done a fair amount of > > research and development into tapeless production on Linux over the years. Mainly > > multi-channel recording, using prosumer Blackmagic card giving up to 4x SD > > in/outs. > > Actually, my consummer Canon 60D has no video over USB, but does have both > video out and hdmi out. So these cards are certainly a working solution. > The cost compares very favourably with many of the audio cards > mentioned/recomended on this list too. with a single i/o starting at $145 > and four channel i/o still less than $1000 (manufacture's recommended > price). For PCIe, there are also USB3 and Thunderbolt (AKA firewire with a > converter? I have noticed all the new firewire audio IF call themselves > Thunderbolt compatable with an adaptor) > I assume you mean analogue video (often a yellow phono) rather than digital, SDI out of your camera? (Min = Googling...) Yep as expected: Video output (PAL/ NTSC) (integrated with USB terminal) so you would need an oldschool capture card for that, and audio separately (although on same card and you have minijack out.) Lower quality, cheaper, not sure of any with Linux capacity for streaming into other programs though (most seem to do internal mpeg and stuff...) HDMI mini output (HDMI-CEC compatible) You can be pretty certain the HDMI contains audio though so will want an HDMI card. I've only had experience of PCI)e) personally but as you say they claim Linux support for the range. > And it seems once again I am behind in my knowledge of new video standards > (probably old by now) Both this product as well as the Rohde & Schwarz > stuff talk about audio embedded in the video. 16 channels AES/EBU (8 > pairs) per video channel. Maybe this is another audio interface solution > as well. (the box for embedding would be somewhat pricy $1000 for aes in > then ADCs to feed that... USB2 with an ADAT would be way cheaper for the > same channels) > HDMI should get around this. > Best of all, both products proudly display that they have both drivers and > SDK for Linux. The Blackmagic says they are open standard capture cards > and that the SDK is free (maybe not open?). It appears that the target > audience for these products are used to doing their own inhouse software > to use them. > > The recommended system to run them on does not seem above midrange for a > home system. It seems many of these cards do some switching/keying on the > card. I would guess this includes fades as well. > > > True and true. Good luck :) Dale > > -- > Len Ovens > www.ovenwerks.net > |
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