Working with audio

The program supports the following audio formats:

• Streaming Audio (.mp3, .m4a, .flv)
• Flash Audio (.flv)
• Uncompressed Windows audio (.wav)
• MPEG, Audio layer 3 (.mp3)
• MPEG 4 Audio (.m4a)
• Advanced Systems Format (.asf)
• uLaw audio (.au)
• Windows Media audio (.wma)
• Windows Media Services Streaming Audio

	•	On mobile devices, only .mp3 audio and .mp4 video file types are supported. Additionally, synchronized events are only supported with .mp3 audio and .mp4 video file types. Synchronized events are actions configured to run at specific times while the media object is playing, like hiding or showing messages or moving a pointer on a diagram. For more information, see Adding and managing the synchronized events of an audio object and Adding and managing the synchronized events of a video object.
	•	Selecting the optimal audio bit rate - the rate at which the audio data is transferred - directly determines the overall size of the audio object. The higher the bit rate, the larger the file is that needs to be transferred online. Additionally, long audio objects recorded with unnecessarily high bit rates can lead to using up your bandwidth and the bandwidth of your users. Music perfectionists demand the highest bit rates for music; however, for audio objects containing mostly voice and talking, lower bit rates - 64kbps to 192kbps can be used (96kbps in mono recording is recommended). If file size is an issue and the object contains only voice narration, 64kpbs mono is suggested. For more complex audio objects - often with sound as a background to voice sections - you might want to increase to 128kbps to provide extra clarity. Always choose a constant bit rate; variable bit rates can cause problems and are not recommended. Replay your audio objects to make sure the quality is achieved while maintaining manageable file sizes.

View these topics for more information about working with audio objects:

• Recording new audio

• Adding an existing audio file

• Converting text to human-like speech

• Changing the name of an audio object

• Changing the resource of an audio

• Enabling author control on an audio object

• Editing an audio object

• Specifying a description of an audio object

• Viewing the HTML name of an audio object

• Making an audio icon or controller initially invisible

• Placing an audio icon or controller on the top layer

• Automatically starting the audio object

• Continuously playing the audio object

• Converting to MP3 audio

• Specifying the type of audio

• Specifying a display type for audio

• Applying a skin to the audio controller

• Specifying the CSS class of an audio

• Locking the size and position of an audio icon or controller

• Adding and managing synchronized events of an audio object

• Changing the transitions of an audio object

• Adding a reference to an audio object

• Including metadata for an audio object

• Working with closed-captioning audio

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