What is m4b?
In addition the relevant M4A file, a M4B format is a M4A file that can be bookmarked and are therefore better used for audio books and podcasts. This MPEG-4 Audio file is a layer file that is becoming the new standard for audio compression and is often used as the audio in MPEG-4 movies.
What is qcp?
The QCP extension, which is related to the QCELP extension, is a PureVoice File by Qualcomm. There are converters that convert the audio files carrying the QCP extension to a WAV format. Mime type: audio/x-gsm, audio/x-sd2, audio/vnd.qcelp, application/x-rtsp
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