McDewey

Description Codecs Preference Order H.263 and H.261 codecs exhibit the following parameters and typical values: • Bit rates range from 64 kb/s to a few mb/s. These bit rates can exist in any multiple of 100 b/s. H.261 and H.263 can function with bit rates lower than 64 kb/s, but video quality suffers in such cases. • One-quarter Common Interchange Format (QCIF) (Resolution equals 176x144.) • Common Interchange Format (CIF) (Resolution equals 352x288.) • 4CIF (Resolution equals 704x576.) • Sub QCIF (SQCIF) (Resolution equals 128x96.) • 16CIF (Resolution equals 1408x1152.) • Custom Picture Format • Resolution: • Frame Rate: 15 frames per second (fps), 30 fps • Annexes: F, D, I, J, K, L, P, T, N H.263 5 H.261 6 The bandwidth of video calls equals the sum of the audio bandwidth and the video bandwidth. The total bandwidth does not include overhead. A 384-kb/s video call may comprise G.711 at 64 kb/s (for audio) plus 320 kb/s (for video). This sum does not include overhead. If the audio codec for a video call is G.729 (at 24 kb/s), the video rate increases to maintain a total bandwidth of 384 kb/s. If the call involves an H.323 endpoint, the H.323 endpoint may use less than the total available video bandwidth. Regardless of protocol, the endpoint may always choose to send at less than the max bit rate for the call. AV1 Codec Support AV1 is a next-generation video codec developed by the Alliance for Open Media. The benefits of AV1 are: • Reduced bandwidth consumption and better visual quality by utilizing better compression efficiency compared to other video encodings • Enables video for users on very low bandwidth networks • Significant screen sharing efficiency improvements over other codecs Unified Communication Manager supports negotiation of AV1 codec to establish media if endpoints support the AV1 codec. When both endpoints support Multiple Codecs in Answer, Unified CM negotiates all the matching codecs including AV1 based on the preference order received. The endpoint will then use one of the codecs from the Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 862 SIP Interoperability Video Codecs