Yearly Archives: 2015


The VLC media player includes file cache and stream buffer options to enable fine-grained control over video playback on machines with limited system resources. If you use VLC to stream network video, you can set the buffer size on a per-stream or permanent basis. For local file playback, you can […]

How to Change the Buffer on VLC


As you may know, to be a robust meeting entity, we must take good care of compatibility requirements for different facilities from different manufacturers. In H.323 protocol, we can use fields like Vendor ID, Product ID, Version ID in the signaling commands. But how to do this when you are using SIP protocol? Definitions in RFC 3261 20.35 Server    The Server header field contains information about the software used    by the UAS to handle the request.    Revealing the specific software version of the server might allow the    server to become more vulnerable to attacks against software that is    known to contain security holes. Implementers SHOULD make the Server    header field a configurable option.    Example:       Server: HomeServer v2 20.41 User-Agent    The User-Agent header field contains information about the UAC    originating the request.  The semantics of this header field are    defined in [H14.43].    Revealing the specific software version of the user agent might allow    the user agent to become more vulnerable to attacks against software    that is known to contain security holes.  Implementers SHOULD make    the User-Agent header field a configurable option.    Example:       User-Agent: Softphone Beta1.5     [H14.43] User-Agent definition in RFC2616 14.43 User-Agent The User-Agent request-header field contains information about the user agent originating the request. This is for statistical purposes, the tracing of protocol violations, and automated recognition of user agents for the sake of tailoring responses to avoid particular user agent limitations. User agents SHOULD include this field with requests. The field can contain multiple product tokens (section 3.8) and comments identifying the agent and any subproducts which form a significant part of the user agent. By convention, the product tokens are listed in order of their significance for identifying the application. User-Agent     = “User-Agent” “:” 1*( product | comment ) Example: User-Agent: CERN-LineMode/2.15 libwww/2.17b3     How TANDBERG and Polycom implemented? TANDBERG: POLYCOM: So, jump to the conclusion: As UAC, identify yourself in User-Agent field. As UAS, identify yourself in Server field. Comparing with TANDBERG and POLYCOM’s implementation, TANDBERG format is more proper.

Vendor ID, Product ID information in SIP












Most of the missing features are AVPF related, which is defined in RFC4585 and RFC5104. RFC4585: Extended RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/AVPF) https://www.rfc-editor.org/rfc/rfc4585.txt RFC5104:  Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF) https://www.rfc-editor.org/rfc/rfc5104.txt AVPF contains a mechanism for conveying such a message, […]

RTCP and AVPF related missing features






USTC
Last weekend, from May 15 to May 17, I took a train to Hefei along with more than thirty classmates, to attend the desertation defence, the final phase of the postgraduate study. Those were really busy days for all of us, there were so much forms and paper works for […]

Finished my studies in USTC