VBrick dme, Руководство администратора

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142 © Vbrick Systems, Inc.
Reflection of Akamai Streams for Rev VC Live Webcast
DME v.3.15, when used with Rev 7.14 or above, can reflect Akamai CDN streams associated
with Rev's Video Conference (VC) Live Webcast feature. Meaning, the DME will
automatically identify, pull, and cache streams from Akamai to serve them to Rev players.
This allows customers to minimize Akamai and Internet bandwidth usage, while maximizing
distribution through DMEs to many concurrent live Webcast viewers.
In order to utilize this feature, you must first be set up with the Rev Video Conference
Recording and Streaming feature and be provisioned with Akamai publishing points/
hostnames. This is a back-end activity by the Vbrick Operations team.
Rev uses its Zone Logic feature to identify which DME (v3.15 or newer) that services a given
viewer's play request for a VC Live Webcast. The player, via Rev, uses a special playback URL
Predefined Profile Name of the Vbrick pre-configured proportional profiles you may
select from the dropdown list based on the Input Stream you have
selected. Each profile, along with an Input Stream selected above, will
define the recommended Video Target settings including bit rate,
resolution, and frame rate.
In the image above for example, the Input Stream is defined at
1280x720 resolution while the profile specifies a half-size. As a result,
the final resolution in Video Target settings is defined as 640x360.
You may also select common stream and common television profiles.
You may overwrite these settings if desired.
Note: You should not change the Framerate if you have closed
captioning.
Quality Medium = default. Set to Extreme, High, Medium, or Low. Higher and
Extreme quality settings have higher bit rates and will require more
processing.
Video Targets Sets the video, audio, and resolution parameters for the output stream
based on the Input Stream and Predefined Profile you select.
Extra Parms The DME currently uses the ffmpeg library for doing stream
conversions. Use this field to enter specific parameters to ffmpeg for
your streams.
For a library of possible conversion options please visit https://
ffmpeg.org/ffmpeg.html. This is an advanced feature, so use additional
options with care. They will override the selected template in the
Conversion Type. As such, not all possible combinations are tested or
supported by Vbrick. Also, if not used properly they can adversely
affect DME performance as this is a CPU intensive feature.
Note : When working with streams with closed captions, do not change the
framerate. You can still change the resolution and bitrate, but changing the
framerate will have adverse effects on CC data. In these cases, please keep
framerate set to
Current Rate .
Field Description