decode RTP H264 live Stream

How to use this

• send H264 stream to your computer, for example, port 5006(in my code)
• put main.c file in ffmpeg/doc/example, run following command

gcc -o main main.c -lavformat -lavcodec -lswscale -lz
./main

• You can send stream using example2 in this link. By the way, there may be a few bugs in this example(regarding SPS and PPS), so at first you cannot decode, you need wait for a while or click the "swap" button to swap the camera(the code will resend SPS data).