Converting .wav audio to .3gp video format.
As far as we know, converting WAVE Audio Files directly to 3GPP Multimedia Files (.wav to .3gp conversion) is not only possible, but quite straightforward. This relates to users attempting to encode WAV audio to 3GP video.
Audio editors and (online) converters, such as FormatFactory or SUPER, will allow you to import WAV audio files and export them in 3GP format.
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A multimedia converting tool for Windows
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Audio converter for Mac
A video editing software for Windows