title: ffmpeg decoding slow calling without avformat_find_stream_info
body: <p>I am decoding h264 rtp stream with ffmpeg on android. I found a strange problem: if I don't call <code>avformat_find_stream_info</code>,decoding <code>P frame</code> takes tens of micro seconds, by contrast, calling <code>avformat_find_stream_info</code> before decoding will reduce <code>P frame</code> decoding time to less than 1 ms on average. However, <code>avformat_find_stream_info</code> itself is time consuming on network streams. Are there anything I can do to make decoding fast <strong>without calling</strong> <code>avformat_find_stream_info</code>?</p>