Raspberry Pi Forums

I'm looking to stream 1080p 30fps video around 1km from the pi wirelessly. I'll be using a 2200mAh battery, possibly multiple in parallel.

I literally have no idea where to start, I have experience with wifi and zigbee chipsets as well as FM and AM transmission (modulating and demodulating). Obviously none of these will work... I'm looking for someone to point me in the general direction of what I should be thinking of and I'll figure out the rest.

The most important aspect is low-latency and the ability for the system to be transmitting while moving...

Thanks...

The difficult bit is the transmission over 1km. I'd use standard wireless for that, but you'll need a directional antenna to get the range. Which sort of conflicts with the on the move requirement.

Race car telemetry?

jamesh wrote:I'd use standard wireless for that, but you'll need a directional antenna to get the range. Which sort of conflicts with the on the move requirement.

Now you've got me imagining a servo-controlled directional antenna, with the antenna orientation calculated using the last-known GPS coordinates transmitted to it from the remote-camera-unit...

Even with a static (non-moving) directional wifi antenna, would you still get enough bandwidth over 1km to stream 1080p 30fps video

AndrewS wrote:Now you've got me imagining a servo-controlled directional antenna, with the antenna orientation calculated using the last-known GPS coordinates transmitted to it from the remote-camera-unit...

Even with a static (non-moving) directional wifi antenna, would you still get enough bandwidth over 1km to stream 1080p 30fps video

You also need to put both antennas at least 5m above the ground (google fresnel zone) or one antenna on the ground and other much higher.

1080p 30fps bitrate depends on several factors. Highly compressed (compression artifacts clearly visible) h264 video (1080p, 30fps) with a few interframes is only 120 kbps (15 kB/s). Thats the minimum you'll need. I guess transfer speeds are much better so it's possible to increase video quality.

Whoa! Thanks for the replies guys!

As for the move requirement, the system most likely wont be moving any faster then 20km/h. We plan on having a GPS module on the system, so I really like the idea of the servo-controlled directional antenna. Most likely sending the position data using another transceiver... xBee pro most likely...

Just to make sure, when you say "standard wireless" you mean IEEE 802.11 (wifi), would something like this work:

http://www.gnswireless.com/GNS1405.htm

What's the most powerful wireless router you can get? and how do you go about installing something like this? any links/info are appreciated