If an M4A file was not "Finalized" (properly closed) during recording (e.g., a recorder battery died), the header atom ( moov atom) may be missing. Audition relies on this header to navigate the file structure.
M4A files are often sourced from mobile devices recording at 44.1kHz or 48kHz. Audition’s internal engine requires a session sample rate match. If an M4A is imported into a session with a mismatched sample rate (e.g., importing a 44.1kHz M4A into a 48kHz video project), Audition performs a real-time sample rate conversion. This conversion, combined with the AAC decoder, can introduce phase artifacts if the resampling algorithm is set to "Low Quality" in the Preferences menu. adobe audition m4a
| Feature | MP3 (MPEG-1 Layer III) | M4A (MPEG-4 AAC) | | :--- | :--- | :--- | | | Lower; requires ~192kbps for transparency. | Higher; requires ~128kbps for transparency. | | Frequency Response | Hard cutoff typically at 16kHz-20kHz. | Sharper cutoffs, better preservation of high frequencies. | | Audition Processing | Native support, rapid seeking. | Native support, slightly higher CPU overhead for decoding. | | Export Speed | Faster encoding times. | Slightly slower encoding times due to complexity of AAC algorithm. | If an M4A file was not "Finalized" (properly