use of av_sdp_create from an encode AVPacket

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C++

ffmpeg

Hi
I was able to encode a raw image to h264, and now I want to be able to transmit it to RTSP using live555. I want to create a sdp so I can put it into live555, so after a bunch of searching I found there is a function av_sdp_create, but I dont know how to use it... The first argument is AVFormatContext and I only have a AVPacket with the compressed data. How do I set this function up so that it can generate a sdp for me.

size = avcodec_encode_video2(codecContext, &pkt, frame, &output);

pkt is an AVPacket, is there a way to use av_sdp_create with the AVCodecContext and AVPacket?

Thanks in advance.