Fixes and improvements
- General: fix rtmp -> rtsp audio conversion (#932)
- RTSP server: improve performance when reading with TCP
- RTSP server: fix wrong RTP-Info header that caused error messages in FFmpeg after 13h14m of reading (#922)
- RTSP source: support cameras that provide base URL inside control attribute (#683)
- RTMP server: fix bias error in AAC timestamp
- HLS client: improve video / audio sync