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# Prepare the Audio

IDOL Speech Server accepts most media files. However, this does not apply:

- If you are processing streamed audio data. (For details about how to stream audio data into IDOL Speech Server, see Stream Live Audio.)
- If the `FFmpegDirectory` configuration parameter is not set.

In these cases, you must supply the audio as either 8 kHz or 16 kHz, mono or stereo 16-bit linear, little-endian PCM data. For details of the audio quality requirements, see Audio Quality Guidelines.

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