Dear all,
I am now studying RTSP playback the content from m.youtube.com using
Mplayer/Live555. This is my testing environment: Ubuntu 7.0.4,
Mplayer-1.0rc2, live.2008.07.06. rtsp-stream-over-tcp is enabled at
first when trying to play
rtsp://bfug.rtsp-youtube.l.google.com/Ci4LENy73wIaJQlajfjZ7w0SCxMYDSANFE
IJbXYtZ29vZ2xlSARSB2RldGFpbHMM/0/0/0/video.3gp. However Mplayer reported
"Unsupported Transport". It seems that the server from m.youtube.com
could not support RTP over TCP. So rtsp-stream-over-tcp is disabled
instead. Then Mplayer also failed to play the rtsp using RTP over UDP
since my testing PC is behind my company's firewall.But the problem is that the real player can play the same rtsp without any problem, which is also on another pc behind the firewall. Both Mplayer and realplayer packets are captured using wireshark while playing the rtsp. The captured files realplayer_rtsp_m_youtube.cap and mplayer_rtsp_m_youtube.cap are attached FYR. From the captured packets, the real player also uses RTP over UDP. But it can actually go through the firewall. Also from realplayer_rtsp_m_youtube.cap, there are two RTP packets which are sent from my local PC (10.6.64.218) to m.youtube.com (72.14.209.177) before actual RTP/UDP packets receiving from youtube server. It seems that these two RTP packets with empty content triggered the firewall bypass. From mplayer_rtsp_m_youtube.cap, there are no such kind of triggered packets. So by my estimation, this is probably the reason that realplayer can bypass the firewall but mplayer cannot. So my question is that whether live55 have any plan to support similar mechanism with RTP over UDP to bypass the firewall? Another question regarding the packets from wireshark. I can find such warnings "Checksum: 0x65bf [incorrect, should be 0x60a6 (maybe caused by "TCP checksum offload"?)]" for some rtsp/tcp packets. Does anybody know what's the problem? Thanks. Rgds, Laifa ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This message (including any attachments) is for the named addressee(s)'s use only. It may contain sensitive, confidential, private proprietary or legally privileged information intended for a specific individual and purpose, and is protected by law. If you are not the intended recipient, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. Any use, disclosure, copying, or distribution of this message and/or any attachments is strictly prohibited. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mplayer_rtsp_m_youtube.cap
Description: mplayer_rtsp_m_youtube.cap
realplayer_rtsp_m_youtube.cap
Description: realplayer_rtsp_m_youtube.cap
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