[Libav-user] C-Sample code for an RTP Video streaming Server

[Info || Non-Lethal Applications]

Hi,

> On 04 Apr 2015, at 01:36, robotanarchy <robotanarchy at bingo-ev.de> wrote:
> 
> Hello libav-users,
> 
> I'm just getting started with using libav and it is hard to find any
> sample code, except for what is in the doc/examples folder of the
> source tree [1].
> 
> More specifically, I'd like to create a RTP video streaming server in C.
> The closest thing to an example code was this [2] on stackoverflow -
> but it is said not to work well and also it doesn't compile with the
> latest ffmpeg.
> 
> I've also tried to fork ffserver, but it also won't compile outside of
> the ffmpeg source tree. Its main file, ffserver.c [3], has this infront
> of most of the header files:
> 
> 	// FIXME those are internal headers, ffserver _really_
> 	shouldn't use them
> 
> ...so this also doesn't seem to be a good starting point either. I'm
> wondering if such an RTP server is even possible without these internal
> headers.
> 
> If it is, can someone please provide some readable example code, that
> does nothing but serve a video over RTP?
> 
> Kind regards,
> robotanarchy

We just did that recently and it worked quite well (we were streaming a live video source to an iPhone).

For a very basic approach, you can simply look for examples on how to encode a video file with libx264.
All you need to do make RTP work is set the output URL as you would normally set a file.
Here’s a short snippet:

_pVideoOutputFmt = av_guess_format("rtp", NULL, NULL);
    
_pVideoFormatCtx = avformat_alloc_context();
avformat_alloc_output_context2(&_pVideoFormatCtx, _pVideoOutputFmt, "rtp", _url.c_str());
        
/* open the output file, if needed */ 
if (!(_pVideoOutputFmt->flags & AVFMT_NOFILE))
    avio_open(&_pVideoFormatCtx->pb, _url.c_str(), AVIO_FLAG_WRITE);


And don’t forget to do a avformat_network_init(); or else RTP won’t work.

Hope this helps getting you started!
Best regards,

Flo
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