BRIDGE LIVE Video I/O and Streaming Appliance v1.12 80 www.aja.com
Output Stream Video Configuration Options
Video Codec
When selecting which codec to use, one aspect to consider is the type of
equipment being used by the receivers. If their equipment does not support the
higher demands of the codec, that could present challenges, especially if the
receivers would be required to purchase new equipment in order to be able to
receive the signal.
Choose from settings for the chosen video codec that define quality vs. speed
difference.
NDI
NDI is a flexible and versatile solution, allowing multiple video streams on a
shared connection. NDI supports high quality, low latency, frame-accurate video
over standard Ethernet networks. NDI stands for Network Device Interface and is
developed by NewTek.
HLS
BRIDGE LIVE supports output stream type HLS (HTTP Live Streaming), an adaptive
bit rate streaming protocol. HLS supports both AVC TS segments with H.264 and
Fragmented MP4 with both H.264 and H.265. HLS supports audio formats EAC3,
AC3 and AAC.
SDI sources or IP video stream sources can be input to BRIDGE LIVE, and then
encoded for output via HLS.
Based on TCP, HLS is used to deliver content to end point devices such as phones
and tablets or applications such as web browsers. For browsers all that is needed
is the URL with the playlist extension. Safari has this support natively; Chrome and
Firefox have extensions available for HLS playback.
NOTE: HLS is not useful for contribution, backhaul or any other workflow that requires
low latency.
The best way to deliver HLS with BRIDGE LIVE is to provide the pre-packed
video to a CDN. This means many end-point-devices can utilize the content
simultaneously.
JPEG 2000
JPEG 2000 is an image coding system that uses state-of-the-art compression
techniques based on wavelet technology and offers an extremely high level
of scalability and accessibility. Content can be coded once at any quality, up to
lossless, but accessed and decoded at a potentially very large number of other
qualities and resolutions and/or by region of interest, with no significant penalty
in coding efficiency.
Two methods used to transport JPEG 2000 are VSF TR-01:2103 and VSF TR-01:2018.
H.262 Encoding Options
H.262 is the official name for MPEG-2. Since it is the oldest of the codecs and it has
been around for a long time, many people are familiar with it and know how to
work with it. It is known to be reliable.
• Profile: High, Main, Simple
• The Simple profile allows you to use only I and P frames, while Main or High
profiles support even B frames. All H.262 profiles are 4:2:0. The High profile
also supports Spatial and SNR scalability modes. For bit rates and profiles,