[HOWTO] RPI & Pixhawk with 4g Cell, Video & Telemetry

chomic

Thank you Bernt, i do not know is it good or ba,d but i managed to stream video to pc and I can see it through gstreamer, BUT with input line:

gst-launch-1.0 -e -v udpsrc port=5000 ! application/x-rtp, payload=96 ! rtpjitterbuffer ! rtph264depay ! avdec_h264 !fpsdisplaysink sync=false text-overlay=false

what you think ?
regarding VLC i did not succeed to get video. maybe to less knowlage how to configure VLC
in any case it works at this step and i'll go forward

Thank you very much
Chomic

chomic

Dear Bernt, Sorry, I did not mentioned, that i left old code with "1"(number) in raspbery and it works.
Regarding telemetry from pixhawk, - why you have choosen conversion from TTL to Ethernet, but not from TTL to USB?
Br, Chomic

Sinamics

For VLC streaming,
just create a new file with sdp extension, eg. vlc.sdp copy paste the bellow code

SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 10.0.0.225
t=0 0
a=tool:libavformat 56.33.101
m=video 5000 RTP/AVP 96
b=AS:200
a=rtpmap:96 MP4V-ES/90000
a=fmtp:96 profile-level-id=1

save the file and run it.
You dont need to change the IP adress as long as you are streaming UDP. TTL to USB would probably work also. Either way require serial data to be redirected to NET. So i dont see any advantage using USB over Eth

chomic

Thank you very much. I'll try. Br, Chomic

Chuckster1

Hi Bernt.
I have an easy question for you, when you say "Debian" Wheezy, is that different from just regular Wheezy, and is it a full desktop version that loads up? I'm using Wheezy which has a desktop when I hook a hdmi cable to it.

Just thought that maybe what you were using may be using less resources, resulting in better video. I can't seem to improve my video that much.

Sinamics

Hi there.
Im also running full desktop version Whezzy.
Whezzy is buildt on the Debian Project GNU/Linux and has a X window(desktop). You could remove the X window part if you dont want it.

Roberta_Gil_Cembrano

Hello Bernt,
first of all thank you for your job, is a great job!! my name is Robert and I´m interested too, but I am having problems with gstreamer, tell you.

I have a raspberry b+ with debian and a picam. In the other side I´ve a laptop with windows 10 and gstreamer too. When I put in the command line of laptop

gst-launch-1.0 -e -v udpsrc port=5000 ! application/x-rtp, payload=96 ! rtpjitterbuffer ! rtph264depay !
 avdec_h264 ! fpsdisplaysink sync=false text-overlay=false

and it respond

Setting pipeline to PAUSED .../GstPipeline:pipeline0/GstFPSDisplaySink:fpsdisplaysink0/GstAutoVideoSink:
fps-display-video_sink/GstD3DVideoSink:fps-display-video_sink-actual-sink-d3dvideo: sync = false 
Pipeline is live and does not need PREROLL ... 
Setting pipeline to PLAYING ... New clock: GstSystemClock  continue...

Roberta_Gil_Cembrano

In the raspberry I type gstreamer.sh with your command

raspivid -n -w 1280 -h 720 -b 1000000 -fps 15 -t 0 -o - | \gst-launch-1.0 -v \fdsrc ! \h264parse ! \rtph264pay 
config-interval=10 pt=96 ! \udpsink host=192.168.1.108 port=5000

and it responds

/home/pi/gstreamer.sh: raspivid: not found
setting pipeline to PAUSED....
Pipeline is PREROLLING....
ERROR: from element /GstPipeline:pipeline0/GstH264Parse:h264parse0: no valid frames found before end of stream
Additional debug info:
gstbaseparse.c(1146):gst_base_parse_sink_event_default (): /GstPipeline:pipeline0/GstH264Parse:h264parse0
ERROR: pipeline doesn´t want to preroll.
Setting pipeline to NULL...
Freeing pipeline...

I take two weeks before ask you but I´m jamming, thank you for your time and the others members too.
Sorry for my english

Roberta_Gil_Cembrano

Sorry
In the last post I must type #!/bin/bash before raspivid.......... now I can watch the video ok. Don´t worry I´m sure I will have more questions for you. Thank you very much
I´m happy now!!

Sinamics

Hi Roberta Great news. I was quite busy at the time you posted.
Please, dont hesitate to ask again..

Heiko_S

Hey Bernt,

I'm using Iris /w pixhawk. One telemetry slot is used for the 3dr telemetry and the the other for the FrSky telemetry. What can I do to connect the pixhawk to my RJ45/ttl converter?
Cheers,

Sinamics

Hi Heiko I dont think you can without changing the APM software or adding extra components. In my opinion you will need a mulitplex er or serial splitter.

Heiko_S

What about removing FrSky? As far as I understand it's used for additional data at my RC?
Can I get those informations right to my GCS? I'm new to UAV's and would like to avoid adding another "new" component

Sinamics

Yes, you could remove the FrSky.
You will get all that information from Mission Planner + a ton more..
Using FrSky telemetry will be overkill, in my opinion.

Heiko_S

Just to be sure, I can remove the FrSky transmitter from the Iris and will still be able to fly.
I just don't get the lat/alt/att/distance/mah-used information at my TH-9x, but instead at my GCS via
Pixhawk->TTL->RJ45->PI->LTE->GCS?

Thanks for your answers Bernt!

Sinamics

Yep, correct.
You dont need that information on your radio, since you are getting that info anyway using Mission Planner via LTE

mattiao

Dear Bernt,
I have almost finished to setup everything like in your instruction, but I have a problem: it looks like that the USB cellular adapter is creating strong interferences with the RC receiver (I have an old 75MHz), so I am a bit afraid to make it flying. I am worried that if I loose the GCS connection I will not be able to control the drone with the RC gtransmitter because the signal will be too much disturbed by the USB modem.

Did you ever have this problem?
Regards.

Sinamics

hmm. Interesting. I always use 2.4ghz transmitter so i never had this problem..
Could you make a video clip of the interference?

useful link

mattiao

Now I don't have the drone with me, maybe I can do it this evening or during the weekend. Anyway what you see in
the page to calibrate the RC in Mission Planner is that all the channels are fluctuating a bit whe the transmitter is on, but the situation becames much worse turning off the transmitter: the channels goes from 0 to 2000 randomly and so the faisafe of the RC does not start!!!

Sinamics

That seems scary.
What if you disconnect the receiver, does the interference goes away then?

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