Audio time expansion / compression

I work in a broadcast environment (radio). We use hearing CS6 in all our production studios. All the outputs of the hearing must be 16-bit or WAV or MP3 files with a sampling frequency of 44100 Hz, stereo. Promotions and underwriting announcements are generally 30 seconds and, occasionally, 60 seconds in length. Another range of segments from several minutes to a maximum of 58 minutes. Whatever the length, it must be accurate. For example a half hour segment targeted to run for 29:00.000 may end up 28:57.043 or 29:03.495. How can I expand or compress the time of a session without changing the pitch? Sessions can be simple mono tracks or tracks multichannel stereo. It became an urgent situation for us due to the installation of a new system of automation that requires accurate hours and does not provide this functionality of squeeze / expansion of time.

If you open the file in the waveform display, and then open the effects > time and Pitch > Stretch and Pitch (process)... you can easily stretch or shrink a file to a specific length of time without height adjustment.  Make sure that the 'Stretch and Pitch Shift (Resample) Lock' is NOT checked to avoid pitching change.  Since you'll be stretching to a length, you can check the 'Locking Stretch to the new duration settings' option as well.

When recording, it is best to save as uncompressed WAV file where length will be more precise and the compression artifacts will not be a problem.  However, if you save it in MP3 format, be sure to save with the "Constant" active Type parameter.  Variable bit rate can shake the algorithms used to determine the length of a file.

Tags: Audition

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