Cobalt-digital COMPASS 9223 Dual-Channel 3G_HD_SD MPEG-4 Encoder Manuel d'utilisateur télécharger pdf (Page 47)

47 9223-OM (V2.0)

given point in time, there will be five or six consecutive files in the configured

directory if the encoder is configured to remove older files.

• Segment (sec): Number of seconds per segment. This defines the approximate size (in

seconds) for the above bitstream encoded files. The valid range is from 1 to 20 seconds.

Note that the clients will experience latency approximately equal to the segment size

times the number of segments. The recommended value is 10 seconds. Setting the

segment size to less than 3 seconds may cause performance issues with the FTP/SFTP

server (especially Windows servers running FileZilla); the result will be a non-zero count

of dropped segments.

• Number of Segments: This defines the number of bitstream segments advertised in the

playlist. The minimum number, as per the HLS specification, is 3. Some set-top boxes

require 4 segments. Apple devices (iPads, iPods, etc.) work well with 3 segments.

• Extra Server Compatibility: Check this box if the encoder has problems renaming files

in the server. This is typically required for Windows FTP servers. Linux-based servers

do not need this. It is recommended to check this box only if your server requires it.

• Keep Segments on Server: Normally, when a segment falls out of the playlist file, it is

automatically deleted by the encoder. If you check this box, the bitstream is left in the

server. Clients will still start playing from the first segment in the playlist.

• Program Name: This program name is placed in the playlist file. Whether or not it is

shown depends on the client. This is an optional parameter.

Using the settings above, if the directory /var/www/TV is published on server

www.example.com as http://www.example.com/TV, the URL for the video will be:

http://www.example.com/TV/live.m3u8

Note that when HTTP Live Streaming is selected, the GOP Mode control is set to Closed GOP

and is not selectable. This is done to ensure that each segment is self-contained.

Also note that, if you are streaming to Apple devices such as iPhones, iPads or iPods, you must

also select the following:

• Audio Encoding: Select AAC-LC.

• Output Resolution: Select one of the resolutions ending in /15p (e.g., 320x240/15p). If

your input is PAL, these resolutions will be shown ending in /12.5p

When using the built-in server in the 9223, the options are:

Newer iPods/iPhones may be able to play higher resolutions and frame rates.

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Cobalt-digital COMPASS 9223 Dual-Channel 3G_HD_SD MPEG-4 Encoder Manuel d'utilisateur Page 47