basic: first RTP packets are lost in the BufferedReader #37

rtsp_connect() reads the RTSP responses through new BufferedReader(new InputStreamReader(s.getInputStream())), then passes the raw s.getInputStream() to tcp_stream(). Any bytes the reader has already buffered (up to 8 KiB, decoded as characters) are lost. These are usually the first interleaved RTP packets: SPS, PPS and the first IDR. The picture then starts only at the next key frame, and the stream has to resync on $.

The DESCRIBE response body (SDP) is also never read with Content-Length. Its lines are consumed by the loop that waits for the SETUP response, which only works by accident.

Fix: read the responses byte by byte from one InputStream, honour Content-Length, and pass the same stream to tcp_stream(). This is what RtspClient.readLine() / readRtspResponse() on v2 do.