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

[robotanarchy]

Am Sat, 4 Apr 2015 01:47:42 +0200
schrieb Info || Non-Lethal Applications
<info at non-lethal-applications.com>:

> 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



Thanks, I'll try that!


Kind regards,
robotanarchy