[Libav-user] Native Frame Rate "-re" option?

[Isaac Wang]

Hello,
I'm trying to stream a UDP video stream in its native frame rate using 
the ffmpeg libraries, but am having difficulty in doing so.  Right now, 
I can display the stream but at first the stream is displayed very 
quickly (aka a higher frame rate than the native one) until eventually 
it displays the video in a stuttering manner.  I read that if you pass 
"-re" to ffmpeg via the command line, ffmpeg will be able to detect the 
native frame rate and display the video with that rate, but I can't find 
any documentation detailing how to do this using the C libraries.  Any 
help would be tremendously appreciated!