Importing digital audio

When you bring audio into Premiere, the software handles it differently depending on the file format, sample rate, and compression method used. Understanding these technical factors helps you make informed decisions about audio quality and anticipate how Premiere will process your files during import.

Digital audio exists as binary data on hard disks, audio CDs, or digital audio tape (DAT). To maintain the highest possible quality, you should transfer these files digitally rather than converting analog outputs through a sound card, which introduces unnecessary quality loss.

Audio source formats

Different audio sources require different handling approaches before you can use them in Premiere. Audio CD (CDA) files cannot be imported directly; you must first convert them to supported formats, such as WAV or AIFF, using audio software such as Adobe Audition. This conversion step preserves the original quality while making the files compatible with your project.

Compressed audio formats like MP3 and WMA use methods that permanently remove portions of the original audio data to reduce file size. When you import these files, Premiere must decompress and, if necessary, resample them to match your sequence settings. While the software uses high-quality resampling algorithms, starting with uncompressed or CD-quality audio produces better results because the missing audio information cannot be recovered.

Native sample rate support

Premiere processes all audio internally as 32-bit floating-point data at your sequence sample rate. This processing method ensures maximum editing performance and audio fidelity throughout your workflow. The software natively supports eight specific sample rates: 8000 Hz, 11025 Hz, 22050 Hz, 32000 Hz, 44100 Hz, 48000 Hz, and 96000 Hz.

Audio conforming behavior

Conforming describes the process Premiere uses to convert audio files into its internal working format. This process occurs during import and affects both your timeline responsiveness and disk space usage. The software saves conforming audio as CFA (Conformed Audio) files in your designated scratch disk location for audio previews.

Uncompressed audio files recorded at natively supported sample rates require no conforming when used in sequences with matching sample rates. However, mismatched sample rates trigger conforming during export or audio preview generation. Files recorded at unsupported sample rates get upsampled to the nearest supported rate; for example, a 11024 Hz source becomes 11025 Hz.

All compressed audio undergoes conforming at its source sample rate during import. A 44100 Hz MP3 file conforms at 44100 Hz, then plays back at your sequence sample rate if they differ, without additional processing. Once Premiere conforms a file, it references that conformed version across all sequences with the same sample rate, provided you haven't moved or renamed the original.

The software also creates PEK (peak) files for all imported audio to draw waveforms in the Timeline panel. These files are stored in your Media Cache Files location and persist across sessions.