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Clock rate (Hz) [note 1] Frame size (byte) Default packet interval (ms) Description References 0 PCMU audio 1 8000 any 20 ITU-T G.711 PCM μ-Law audio 64 kbit/s RFC 3551 1 reserved (previously FS-1016 CELP) audio 1 8000 reserved, previously FS-1016 CELP audio 4.8 kbit/s RFC 3551, previously RFC 1890 2 reserved (previously G721 or G726-32) audio ...
The RTP Control Protocol (RTCP) is a binary-encoded out-of-band signaling protocol that functions alongside the Real-time Transport Protocol (RTP). Its basic functionality and packet structure is defined in RFC 3550. RTCP provides statistics and control information for an RTP session.
For example, an audio application that samples data once every 125 μs (8 kHz, a common sample rate in digital telephony) would use that value as its clock resolution. Video streams typically use a 90 kHz clock. The clock granularity is one of the details that is specified in the RTP profile for an application. [25]
In some RTP systems, each media stream has its own timestamp using an independent clock rate and per-stream randomized starting value. A RTCP Sender Report (SR) may be needed for each stream in order to synchronize streams. [3]
Finally, an attribute is included which maps RTP/AVP payload type 99 to format h263-1998 with a 90 kHz clock rate. RTCP ports for the audio and video streams of 49171 and 51373, respectively, are implied.
The media clock is based on synchronized network time with an IEEE 1588 epoch (1 January 1970 00:00:00 TAI). Clock rates are fixed at audio sampling frequencies of 44.1 kHz, 48 kHz and 96 kHz (i.e. thousand samples per second). RTP transport works with a fixed time offset to network clock.
Clock rate or clock speed in computing typically refers to the frequency at which the clock generator of a processor can generate pulses used to synchronize the operations of its components. [1] It is used as an indicator of the processor's speed. Clock rate is measured in the SI unit of frequency hertz (Hz).
time = time + rate. When the "time" variable exceeds a constant, usually a power of two, the nominal, calculated clock time (say, for 1/50 of a second) is subtracted from "time", and the clock's timing-chain software is invoked to count fractions of seconds, seconds, etc.