Read a video broadcast from a hummingboard card

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hey guys,
I have a SBC (single board computer) called HummingBoard. 
2 small cameras are connected to this card and it is connected via a network cable to my computer.
Using external software I can get a picture from both cameras.
Right now my main goal is to write code in C# that could read the video from the same IP address that the card is transmitting and display it to a client written in WPF.
I would be very grateful if you could give me directions on how to get this started.
Right now all I have is an IP address that the card is sure to broadcast the video to and that's it. I mention that these are two cameras transmitting.
Thank you!

What I have tried:

I've tried several external libraries like Ozeski with no success

Posted 6-Oct-19 3:37am

oronsultan

Updated 6-Oct-19 8:18am

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[no name] 6-Oct-19 11:13am

Unless that "external software" has an "application interface" (i.e. API), you're pretty well out of luck and will have to resort to c/c++. WPF isn't that "low-level".

oronsultan 6-Oct-19 11:20am

You mean it can't be implemented in C#? I know for sure that the source code of the external software where I see the video is written in Java.

Richard MacCutchan 6-Oct-19 11:44am

You can use any language, as long as there is an interface API that accesses the data coming from the HummingBoard. But without an API you need to use the manufacturer's documentation to discover how to read from it.

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RickZeeland · Answer 1 · 2019-10-06T08:19:00

Solution 1

If you don't know what protocol is being used, you can use a network analyzer like Wireshark.
This is not for the fainthearted and requires some study.
https://www.slant.co/improve/topics/3692/~best-network-protocol-analysers[^]
When you find out what protocol is being used, try to find a library that supports it.

Look, or use the search option in Wireshark, for things like MJPEG, MPEG4, H264, RTSP etc.
For more details about analyzing a video stream see: how to extract information of each video frames in a video streaming with Wireshark? - Ask Wireshark[^]
And: Wireshark – Extract Video from Capture File | theezitguy[^]

I found some information on RTP that might be useful: https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml[^]

Posted 6-Oct-19 8:19am

RickZeeland

Updated 22-Oct-19 4:03am

v4

Comments

oronsultan 7-Oct-19 2:58am

hello RickZeeland,
I listened to your advice and installed Wireshark. I can see now that the Src Port is 53567 and the Dst Port is 1900 and the protocol is UDP. How am I supposed to move from here?

RickZeeland 7-Oct-19 3:40am

See the updated solution :)

oronsultan 7-Oct-19 5:00am

Thanks again for the quick response. I think I didn't explain myself well enough. I need help finding a way to capture this broadcast and display it via C # and WPF.

RickZeeland 7-Oct-19 8:45am

If you know the protocol, e.g. RTSP, find a library that you can use e.g. LIVE555 or Streamcoders medialibrary or Intel IPP.

oronsultan 7-Oct-19 9:05am

the protocol is UDP and the library is datagramsocket (i think).

RickZeeland 7-Oct-19 11:34am

UDP and TCP are just the basic protocols, look for things like MJPEG, MPEG4, H264, RTSP. If you don't see these I'm afraid things will get very complicated and you will need insider information / example code from the manufacturer.

oronsultan 22-Oct-19 9:26am

Hi, I was able to find the protocol (RTP) and get the information that comes from the card. Do you know a good way to read the RTP protocol so that I can process the information into an image / video?
For example:
"RTP0WI\n\0\u0001\0\0\0\u0014\0?\u0003\u0005\"\u001di%\u0014xB\0\0\0\0p~?s\0\0\0\0\0\0\0\0D002??VB?\u0001\0\0\u0006CAMERAZJ\0\0\nX\0\0\0H\0\0\0\u0001\0\0\0\0?\a\0\0\0\0\0\0\0\0\0\0\0\0?\0\0?\0\0?\0\0?z?ru?rs?rz?mu?nq?su?qv?rr?mp?st?qr?pv?qv?rs?ss?vl?ru\u007fwx?ws?uo?{\0\0?p?wu?yp?{t?\u007fs?z\0?\0\0?\0\0?\0t?|s?|u?}{?}\0?\0\0?\0\0?\0y??v??}?\u007f|??\0\0?\0\0?\0\0?{??\u007f??{??{??|??\0?\0\0?\0\0?\0}?????\u007f??\u007f??{??\u007f??}??|?????{???????????????????????????????????????????????????????????\0\0?\0\0?\0\0?\0\0?\0\0?\0\0?\0\0?w?xs?lr?jv?hm?tm?pk?tk?nr?pn?ro?pr\u007ftr~qt~wn\u007ftm?tl?sr\u007fuk?wx?ym?u\0\0?\0\0?n?vs?y\0\0?\0\0?\0?\0\0\0?\0\0?\0\0?v~~u??y?}\0?\0\0?\0\0?\0v??s??{??w??\0\0?\0\0?\0\0?\0\0?\0\0?}??|??\0?\0\0?\0\0\0?\u007f??\0\0????\0\0?\u007f?????\u007f??\u007f??|?????}??z????????????????????????????????????????????????????????\0\0?\0\0?\0\0?\0\0?\0\0?\0\0?\0\0?{?vq?ou?ro?qt|tr?qq\u007ftn?qp?qs?qn?tl\u007fuo?ql?sp?rn?up?tr?qp~zs?xt\u007fy\0\0?\0\0?n?uq?v\0\0?\0\0?\0\0?\0?\0\0?\0u?\u007f\0\0
?u?{q?{\0\0?\0?\0\0\0?\0\0?\0\0?y??\0\0?{??{??\0\0?t??\0\0?\0\0?~??\0?\0\0\0?\0\0?\0\0?\0\0?\0\0?\0\0?\0\0?\0\0?\0\0?\u007f??\0\0?\0\0????x????????????????????????????????????????????????????????\0\0?\0\0?\0\0?\0\0?\0\0?\0\0?\0\0?~?tx?os?qn?qm?nv?oq?ok~su\u007fqv?nm\u007fto~tq?qq{xp~th?qp?nr?ro~xn?vs\u007fwv}wq?u\0\0?r?w\0\0?t?v\0\0?\0\0?\0\0?\0\0?\0\0?v~~u??\0\0?\0?\0\0\0?x?~x??x??z??\0\0?y??\0\0"

RickZeeland 22-Oct-19 9:37am

Unfortunately RTP can carry a large number of codec types, see explanation here: https://cardinalpeak.com/blog/the-many-ways-to-stream-video-using-rtp-and-rtsp/
So you need insider information from the manufacturer to be able to decode this.