I tried to play a “rtsp://” URL (using VLC, MPlayer or openRTSP), or a “sip:” URL (using playSIP), but I got an error message “RTP payload format unknown or not supported”. Why?
The problem here is that the “liveMedia” library does not support the “RTP payload format” that is used to stream data with this particular codec. An “RTP payload format” for a codec is a set of rules that define how the codec’s media frames are packed within RTP packets. This is usually defined by an IETF RFC, or – for newer payload formats – an IETF Internet-Draft. However, a few RTP payload formats (usually those whose MIME subtype begins with “X-“) are proprietary, are not defined in publically-available documents. The “liveMedia” library supports many, but not all, RTP payload formats. If you encounter a RTP payload format that is not supported, but which is defined by a publically-available document, then we may be able to add support for it, if there is sufficient interest.
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