simplesi
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Location: Euxton, Lancashire, UK
Contact: Website

Project suggestion - stream Living Room TV

Sat May 18, 2013 9:25 am

For a while, I've wanted to use an RPi as a low cost sling-box (takes your sky box video and streams it out over t'internet)

I want to be able to leave the room, go into kitchen and make a cuppa while still watching whatever is on main TV screen on my 'droid

Sling-box does have an droid app for £25!!!!!! (I'm NOT paying that for an app!) so I need another solution
(Wife won't allow TV in kitchen - says it distracts the kids from eating even though 1 They are 21 and 19 and 2 Don't live with us much anymore!)

No-ones come up with a USB capture card solution (AFAIK) so my next idea is just simply point an RPi camera at the TV screen and stream that out to my 'droid.

I can live without sound as kithchen isn't far from Living Room and I can still hear it but need a low-latency solution otherwise the lip-sync will drive me nuts.

So, If your bored this weekend and you fancy a little project.... :)

Ta

Simon
Seeking help with Scratch and I/O stuff for Primary age children
http://cymplecy.wordpress.com/ @cymplecy on twitter

richardp
Posts: 117
Joined: Thu Jan 12, 2012 11:46 am

Re: Project suggestion - stream Living Room TV

Sat May 18, 2013 10:26 am

I wanted to do the same.. using a video grabber from ebay. (stk based) - Video was so bad it was not usable ( Search for USB Redux ), using a test stream the H264 encode was less than ideal, it was very hit-n-miss getting the frames - so I binned the idea.

Richard

Edit : This was 3 months ago... the USB might be in a better state now.
RaspberryPi's galore
Solid run CuBox
ODroid U2

simplesi
Posts: 2327
Joined: Fri Feb 24, 2012 6:19 pm
Location: Euxton, Lancashire, UK
Contact: Website

Re: Project suggestion - stream Living Room TV

Sat May 18, 2013 1:15 pm

it'll be really great if someone gets a proper capture device to work but maybe using the camera at first would let us play with the concept of live streaming from the Rpi :)

Simon
Seeking help with Scratch and I/O stuff for Primary age children
http://cymplecy.wordpress.com/ @cymplecy on twitter

Hardware_man
Posts: 94
Joined: Tue Dec 04, 2012 6:28 pm
Contact: Website

Re: Project suggestion - stream Living Room TV

Sat May 18, 2013 7:34 pm

See the post "Camera Interface Specs"

http://www.raspberrypi.org/phpBB3/viewt ... 43&t=24660

in this section. I have an extended (11 page) discussion with JamesH about some kind of add on board for some kind of universal video input, like an HDMI to CSI2 or component analog to CSI2 add on board and required firmware to use it. It ends (if you don't want to read 11 pages of posts) with Gorden saying he might have a summer intern look at this idea. As this is another application for a universal video input, please add this suggestion to that post.

Hardware_man

simplesi
Posts: 2327
Joined: Fri Feb 24, 2012 6:19 pm
Location: Euxton, Lancashire, UK
Contact: Website

Re: Project suggestion - stream Living Room TV

Sat May 18, 2013 10:58 pm

Video capture is going to be niche so I don't think the Foundation will put any real effort into it so its going to have to be a community effort to get a commercial USB capture device and write the RPi drivers for it.

Someone WILL come along and grab this as a project and be a hero but we need to wait for them :)

Simon
Seeking help with Scratch and I/O stuff for Primary age children
http://cymplecy.wordpress.com/ @cymplecy on twitter

Hardware_man
Posts: 94
Joined: Tue Dec 04, 2012 6:28 pm
Contact: Website

Re: Project suggestion - stream Living Room TV

Sun May 19, 2013 5:26 pm

USB isn't fast enough for uncompressed Video (like HDMI). This was discussed near the end of the extended post that I refered to. And you need access to proprietary information to use the CSI2 input (only input fast enough for uncompressed video). So the Foundation would need to be involved.

Hardware_man

simplesi
Posts: 2327
Joined: Fri Feb 24, 2012 6:19 pm
Location: Euxton, Lancashire, UK
Contact: Website

Re: Project suggestion - stream Living Room TV

Sun May 19, 2013 8:13 pm

Do no USB capture devices supply compressed video? :(

Simon
Seeking help with Scratch and I/O stuff for Primary age children
http://cymplecy.wordpress.com/ @cymplecy on twitter

Hardware_man
Posts: 94
Joined: Tue Dec 04, 2012 6:28 pm
Contact: Website

Re: Project suggestion - stream Living Room TV

Mon May 20, 2013 2:03 pm

If you’re going to use a USB video capture device that compresses the video, then what is the purpose of the Pi?

The Pi must have an excellent implementation of the H.264 compression algorithm. The fact that Samsung chose the Broadcom H.264 implementation over their own H.264 implementation for their latest smart phone shouts that Broadcom must have one of the best, if not the best H.264 implementations available today. The S. Koreans tend to have a lot of national pride about their technology and Samsung must have had a lot of political pressure to use their own technology in their latest smart phone. So Broadcom’s technology must be amazing for Samsung to choose technology over politics.

So it just seems wrong to me to use a USB video capture device and that devices compression algorithm instead of the Pi compression algorithm. But we need a mechanism to take uncompressed video into the Pi.

Hardware_man

cabe
Posts: 24
Joined: Sun Jan 08, 2012 2:54 pm

Re: Project suggestion - stream Living Room TV

Mon May 20, 2013 3:27 pm

I think a HDMI (or SDI....but one step at a time) capture board would be of great benefit to indie filmakers who wish to do WIFI monitoring of a camera from thier iPad.

Prosumer camcorder -----> Capture Board -----> RasPi CSI interface -----> Transcode to H264 -----> Stream to WiFI -----> Webpage with stream for monitoring.

http://www.teradek.com/products/cube_155 is the nearest commercial alternative. As you can see, 50 quid all in (assuming the hypothetical capture board is of similar price to the camera module) seems quite attractive. :)

Obviously the side benefit of being able to stream TV is a bonus, although I suspect it will be unencrypted HDMI only, the HDCP licence is one of those "only if you really have to" kind of things.

simplesi
Posts: 2327
Joined: Fri Feb 24, 2012 6:19 pm
Location: Euxton, Lancashire, UK
Contact: Website

Re: Project suggestion - stream Living Room TV

Mon May 20, 2013 9:04 pm

If you’re going to use a USB video capture device that compresses the video, then what is the purpose of the Pi?
Well for me, I want to watch on phone/tablet in other rooms in the house so quality not top of feature list - av sync/delay would be for me :)

I'm just trying to get an open SD quality Slingbox :)

Simon
Seeking help with Scratch and I/O stuff for Primary age children
http://cymplecy.wordpress.com/ @cymplecy on twitter

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