helix mobile producer on-demand user's guide - RealPlayer

Appendix A:AUDIENCE FILE REFERENCEAPPENDIXAThis appendix describes the audience syntax. Each audience file recordssettings about how clips are encoded. The information in this appendix allowsyou to edit audience information to modify encoding settings.Understanding AudiencesAudience FilesEach audience file defines a single audience for which a clip is encoded. HelixMobile Producer On-Demand predefines a number of audiences that appearwithin the graphical user interface when you click the Audio/Video streamstab. For example, one audience may be for 20K. Each audience specifies thestreaming rates at which audio and video clips are encoded, along with othersettings.The audience files are stored in the audiences subdirectory under theRealNetwork directory in the main Helix Mobile Producer On-Demandinstallation directory. Audience files use the file extension .xml. The beginningof their file names correspond to the audience name in the graphical interface,followed by the video encoder type, the audio encoder type and the total bitrate. For example, when you select 3GPPv5 as export type, the 20k GPRS Voiceaudience in the graphical user interface stores its information in the filenamed 20k_GPRS_Voice-h264-amrnb_20kbps.xml.Some settings in the audience files, such as the video codec, the frame rate,keyframe interval, and buffer size, can be overridden using the GUI interface.You can also edit audience files manually. This allows you to change audienceinformation used by the graphical interface or command line applicationusing a text editor or any automated process that can modify text files.Tip: When creating a new audience file, RealNetworksrecommends that you start with an existing audience file thatyou have renamed.71