VBrick dme Admin Manual page 71

multiple of IDR interval number. Larger segment sizes increase latency. The default settings
will create a latency of about 30 seconds (a common latency for HLS). This is probably
optimal in terms of IDR frame interval/segment sizes. You can reduce latency by forcing the
incoming IDR interval to 1 and setting the minimum segment length to 1 but this will make
the source, the DME, and the client work much harder than they may need to.
You can also enter the bandwidth associated with each incoming stream. The stream
bandwidth is important when generating an adaptive bitrate stream with multiple streams.
Although Vbrick 7000/9000 Series (H.264) encoders include the bandwidth information in
the stream, some stream sources do not. You may need to provide this information (if your
encoder does not) because HLS generation for adaptive bitrate streaming requires accurate
bandwidth information to work properly.
1. Enter the stream name for the generated HLS stream.
2. To create an adaptive bit rate playlist, enter a unique name for your master playlist. This
must be different from any incoming stream name, otherwise leave blank. When blank,
the default non-adaptive playlist name created is "HLS" which is required in the playback
URL. Use the same name when creating multiple HLS streams which are then all
associated with the adaptive bitrate master playlist. The highest bandwidth streams
should be at the top of the list of (1 to 25) HLS streams.
3. If you know your incoming stream does not have bandwidth information, enter a value
(in kbps) in the bandwidth override field for the stream. This value supersedes any value
actually in the stream.
4. Playlists that are created using "rolling" means that the old segments are deleted as new
segments are created for a live stream. In some applications, you may want to keep all
your segments and create an ever growing playlist. This lets you create a DVR-like feature
where users can tune in late into a live presentation, and rewind to the beginning or jump
back to the present.
Caution: the "appending" setting does not delete segments and may adversely impact the
space available on your hard drive. You could conceivably use all remaining disk space if
you leave a live stream running from the source into the DME. Thus a built-in safeguard
stops creating appending segments and switches to rolling segments after 7 days.
Note: if you need to archive appending (non-rolling segmentation), the segments and
playlist are available via FTP in the folder:
streamname
playlists and segments are deleted from disk.
5. The
Playlist Length
DVR functionality when Type = Rolling. This field is ignored when Type = Appending.
Leave at the default (rolling) unless you have a compelling reason to change.
6. The
Minimum Segment Length
segments that will be created. Although reducing this number reduces latency, it also
creates smaller files meaning that the player will need to request new segments more
frequently. Make this number a multiple (2x) of the IDR Frame Interval. For Vbrick
encoders, the default interval is 4, so that 8 (the default) is a recommended value.
7. Enable the stream(s) and click
8. The status will indicate "
" if the input stream cannot be found.
Stream
9. You can also verify the detailed status of your outbound TS stream on the Monitor >
MPS Connections page.
Input and Output DME Streams
DME Admin Guide
, only when the stream is enabled and active. When disabled, all associated
field signals the playlist size of segments and controls the length of
is a number (in seconds) that determines minimum size of
Apply
" if HLS streams are being created or "
Active
/HLS/streamname or /MultiplePlaylistName/
.
Configure a DME Stream
Waiting for
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