User`s guide

Dialogic
®
Host Media Processing Software Release 4.1LIN Release Guide 23
Features
• Video picture formats – QCIF
• Frame rate – Up to 15 frames per second (fps)
• Bit rate – Up to approximately 43 kbps
Video transcoding, video transrating, and image resizing
Video transcoding enables applications to record incoming video in a different format
than what is being received from the network and to play back outgoing video in a
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.
Other Features
Other features previously supported since Dialogic
®
Host Media Processing Software
Release 3.1LIN include:
Audio codecs for 3G-324M
Supported audio codecs are as follows:
• G.723.1 – 5.3 and 6.3 kbps, 30 ms frames, 1 frame per packet
• AMR Narrow Band – 12.2 kbps, 20 ms frames, 1 frame per packet
Note: Using the AMR-NB resource in connection with one or more Dialogic
®
products mentioned herein does not grant the right to practice the AMR-NB
standard. To seek a patent license agreement to practice the standard,
contact the VoiceAge Corporation at http://www.voiceage.com/licensing.php.
Video codecs for 3G-324M
H.263 is supported with these characteristics:
• Profile and level – Profile 0, level 10
• Video picture formats – QCIF and sub-QCIF
• Frame rate – Up to 15 frames per second (fps)
• Bit rate – Up to approximately 43 kbps
RTP video data is compliant with Internet Engineering Task Force RFC 2190, RTP
Payload Format for H.263 Video Streams.