User`s guide

16 Dialogic
®
Host Media Processing Software Release 4.1LIN Release Guide
Features
different format than that of the locally stored file. Transcoding involves decoding and
decompressing the original data to a raw intermediate format (YUV format), then
converting the raw intermediate format to another encoding format.
Video transrating adjusts the number of video frames per second (and bitrate of the
video) between two endpoints to suit the requirements of the device at each endpoint.
Image resizing converts video from one image size to another (for example, from CIF
to QCIF) between two endpoints to suit the requirements of the device at each
endpoint.
These features are available on MPEG-4, H.263, and H.264.
Note: In this document, the term “video transcoding” encompasses video
transcoding, video transrating, and image resizing.
Device support for video transcoding
Video transcoding is supported between these devices: 3G-324M (m3g),
conferencing (cnf), IP media (ipm), and multimedia (mm) devices.
Device support for audio transcoding
Audio transcoding is supported between these devices: 3G-324M (m3g),
conferencing (cnf), digital network interface (dti), IP media (ipm), multimedia (mm),
and voice (dx) devices.
Audio Codecs for Transcoding
Supported audio codecs for transcoding include:
• G.711
• G.723.1
• G.726
• G.729A
• G.729AB
• AMR Narrow Band (AMR-NB)
• G.722
• G.722.2 (AMR-WB)
Video Codecs for Transcoding
Supported video codecs for transcoding include:
• H.263
• H.264
• MPEG-4
3.2 New Multimedia (Audio/Video) Conferencing
Multimedia conferencing is introduced in Dialogic
®
Host Media Processing Software
Release 4.1LIN.