HI, My application use live555 to setup one rtsp server which provide x264 stream, and another module uses vlc to deliver the rtsp to another device. I can?t understand why this issue occurs since I didn?t call any pjsip?s function in another thread, does the ffmpeg matter? Since the vlc and pjsip use ffmpeg together? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20121127/13098069/attachment-0001.html>