Hello I have faced with a task to develop an application that has to receive an RTSP (audio + h.264 video) stream from an Axis IP camera. Basically what I need to do is to consume this stream reliably (i.e., I can't afford my application to crash if there's some network delay) and export it into a file + decode video and do some processing on decoded frames.
Searching in google and through the mailing list, I have found a lot of complaints about the fact that ffmpeg application (not the libavformat library itself, as i understand) has some issues with receiving RTSP stream (carried by UDP packets). I actually launched ffmpeg trying to see how it actually works "out-of-the-box": ./ffmpeg/ffmpeg -i 'rtsp:// a11.l1857056010.c18570.g.lq.akamaistream.net/D/11/18570/v0001/reflector:56010' -vcodec copy -acodec copy -t 3600 -y 'nasa.mp4' (this is NASA translation) and after few minutes (or seconds) of recording I get some kind of error or ffmpeg just stops recording and quits. Well I have a lot to learn and I hope this issue is caused by the application and not by the library itself. What I would like to do now - is to do some experiments and write a simple application that can connect to the RTSP server and start "reading" the stream, transforming it into a series of AVFrame's that I could display using SDL, or edit and save/export. I've played with ffmpeg and SDL (thanks to an awesome Stephen Dranger's tutorial) for a while, so far. But that is, of course, not enough. I have found documentation for the RTSP-related functions of libavformat: http://ffmpeg.org/doxygen/0.6/rtsp_8h.html but as a newbie I couldn't build a working application that can retrieve the stream. I don't even know in what order to call these functions. I'd use ffmpeg.c as an example, but it seems to be huge, I am getting lost in it. Can you point me in the right direction? Maybe a similar question has been answered already, but I missed this answer? How are streaming applications like the one i need to create, built usually (what kind of architecture the applications should have)? How a simple streaming application? Do the problems with the ffmpeg library (unreliability of RTSP recording) extend on libavformat? I am sorry for unspecific questions (I believe the answer would require a whole article to be written :) ), but basically I am asking for a simple sketch and basic ideas I need to delve into. Thank you for everyone who will find some time to respond!
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