Why does the output video have no sound?
As to this issue, please make sure that the source audio file is saved in the same folder as the PowerPoint file for conversion.
And you could try to set to other Audio codec in “Settings->Audio->Audio Code” if it’s available.
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This FAQ is about: Frequently Asked Questions, PowerPoint to FLV Converter, PowerPoint to iPad Converter, PowerPoint to Video Pro, PowerPoint to YouTube Converter