View Full Version : 802.11n Transmitter -> Wireless Recorder?
02-24-2007, 09:26 PM
Is red considering an 802.11n transmitter/recorder (base) offering? I suppose the base could be... a mac. Heh. Would be nice to have a 150ft range and no onboard recording, and I would be terribly worried to have a G sensitive hard drive bolted to the camera.
If I'm remembering right, 4k redcode will be 224Mbits, which is only slightly below the lowest 802.11n spec speed. It maxes out at 540Mbit, I think apple is advertising 300Mbit which seems reasonable and conservative.
Anyway, seems like it would be pretty simple, actually, and having a camera with an IP address would be so nerdy I might trip over the white tape on my glasses while 7UP shoots from my nose. IP "awareness" could also potentially be extremely useful. Could imagine other devices doing TC sync with an NTP variant.
Oop, there I go, just tripped on the tape.
02-24-2007, 10:12 PM
If early benchmarks are any indication, 802.11n isn't going to reliably achieve 28 MB/s at significant distances, no matter what the specs say. And most benchmarks are done in controlled environments. Out in the real world, where the spectrum used by 802.11n is already pretty crowded, things will be even worse.
02-25-2007, 08:57 AM
I don't think 802.11n is likely to be fast/reliable enough to use for live recording.
It would however be potentially very useful for near real-time downloading of footage without needing to disconnect the RED DRIVE. It has been suggested by Stuart that this may be possible using the SD card slot on the camera.
02-25-2007, 09:14 PM
cool now everyone at Starbucks will know when we roll?
02-26-2007, 02:24 AM
cool now everyone at Starbucks will know when we roll?
On the plus side, YouTube will be hosting your daylies for free.
02-26-2007, 04:29 AM
The issue was raised a while ago, and got similar answers then. There is a viability however in providing a wireless connection for onset monitoring at 720p, rather than having to link the camera or RedDrive directly to the monitor. It would also be an excellent addition to Curts motorized gears which is also going to be wifi, your AC could be 100m away but still see what's coming out of the camera and be controlling the focus, zoom etc. It would make life very easy. Done properly wireless connections can be pretty much as secure as a wired connection. The biggest problem facing this is needing more battery power. You have to weigh up in this case though, holding another battery and wireless transceiver or having a wire coming out of the back of the camera and your AC on the camera mans shoulder, both restrict your movements, in my mind the wireless solution would make for a faster and more economical way of filming.
03-06-2007, 04:16 PM
So your new mac laptop is capable of receiving 720 24P 802.11n from the viewfinder.
Is there a transmitter product we can plug into the other VF port or Y off if using both the VF and the LCD so we can send to it?
03-06-2007, 04:29 PM
haha, well if this wireless connection at my condo here is any indication, NO THANKS.
03-09-2007, 03:01 AM
Why not just record to a wax drum? The results would probably be about the same.
03-11-2007, 11:18 AM
So after years of carrying heavy cables to have it all go away with a modulus 3000 and now here we go again.... Gawd I hate Cables!!!! Great opportunity for some tecchy savvy company to make a small HDSDI/hdmi transmitter/receiver!!!
03-11-2007, 11:50 AM
As with most packet based communications you trade reliability with latency.
If you want a reliable link you'll introduce latency in the packet buffer.
Most systems works by having 2-3 times the bandwidth of the encode rate to be able to retransmit a missed data package without the decoder missing a beat.
In a 802.11g system you would encode the data at 6-10 mbps, as the worst case sustained data rate is around 25 mbps.
In a 215 mbps redcode raw link you would need at least sustained 430 mbps to be able to retransfer a package before the next one times out.
Regarding security 128-bit aes would be pretty hard to beat, even by a computer geek at startbucks.
03-11-2007, 06:48 PM
a couple of seconds delay doesn't seem like a big deal at video village. Is there actually a product that can do this? Big as a breadbox?
03-11-2007, 07:27 PM
At the current state of technology, there is no way you are going to send REDCODE RAW (27MB/s) over an 802.11 wireless link. But wireless conectivity created via 720p HDSDI or HDMI input and perhaps 480p DV compressed 802.11 wireless output is just the kind of task that third party companes may choose to exploit.
Mark L. Pederson
03-11-2007, 08:25 PM
But wireless conectivity created via 720p HDSDI or HDMI input and perhaps 480p DV compressed 802.11 wireless output is just the kind of task that third party companes may choose to exploit.
There are a few wireless HDMI products recently annouced:
I would assume you could, if you wanted, pull 720p off of the EVF and send it wireless.
03-11-2007, 11:00 PM
There is an HDMI port and HD-SDI port that both provide 720p. So no need to hack the EVF output.....
03-13-2007, 10:53 AM
downconverter to 480I and out over my modulus sounds like how I'll get this done good ole AJA! $593.00 and video village has a signal albiet not a a very good one. This assumes the HDSDI out from the camera is hot with 1080P 24 out while recording to RED DRIVE. Is that so?
03-18-2007, 12:32 PM
I setup a crude wifi streaming system last year.
It's as simple as having a windows machine with a real-time kona and an Xbox 360
You can download windows media encoder for free. Tell it to broadcast the contents of "XYZ window" to a streaming asf file and click run. Then on a 360 hooked up to an HDTV monitor's component cables you just point it in the right direction of the server. It works but there's about a second of lag total.
You could do the same thing with another PC with Windows media player, but it would cost more and use more power than a simple console setup.