Streaming Media Supplement sa2150 and sa2250

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Chapter 9 Configuring Media-IXT for QuickTime
6. Change the drop-down menu in the QuickTime Settings window from Streaming Proxy to Streaming
Transport (shown below).
7. Make sure that, on the left, Use UDP, RTSP is checked.
8. Make sure that, on the right, Port ID: 554 is checked.
9. Close the QuickTime Settings window.
Configuration variables
Configuration variables reside in the records.config configuration file.
Streaming media configuration variables are not documented in the HP Cache Server Appliance Administrator
Guide, but that guide does contain important general information about the records.config file.
Some configuration variables apply to Media-IXT generally, so they affect WMT, RealNetworks, and
QuickTime streaming. Others affect only one streaming format.
Some Media-IXT configuration variables are not in records.config by default. When this is the case,
these variables' default values are in effect. You can tune these variables by adding the appropriate lines to
records.config, then restarting Media-IXT.
To make Media-IXT recognize new values for QuickTime configuration variables, after editing
records.config, restart Media-IXT.
From Media-IXT’s bin directory, run this command for a single Media-IXT host:
./traffic_line -b
From Media-IXT’s bin directory, run this command for a Media-IXT cluster:
./traffic_line -B
Media-IXT configuration variables
This section describes a configuration variable that is critical for QuickTime streaming.
Media-IXT’s RAM cache
The variable proxy.config.cache.ram_cache_mixt_cutoff controls the size of documents
stored in Media-IXT's RAM cache. Its default value of zero (0) allows arbitrary size documents to be stored in
cache, which is appropriate for streaming media.
The only reason to change this value is a severe memory limitation that causes you to want to control the
information stored in RAM cache.
If you edit the value of proxy.config.cache.ram_cache_mixt_cutoff c, and this value is lower
than the size of an object, that object must be read off disk even if it is a cache hit.