Creating Dolby Digital Professional Output Files

Compressor provides the tools you need to encode, and batch-encode, Dolby Digital Professional (AC-3) audio files.

Dolby Digital Professional format (also known as AC-3) is a very common compressed audio format for DVD-Video discs. Compressor accepts multichannel sound files in a variety of formats and gives you complete control over the AC-3 encoding process. Dolby Digital programs can deliver 5.1-channel surround sound with five discrete full-range channels (left, center, right, left surround, and right surround) plus a sixth channel for low-frequency effects (LFE), sometimes known as “the subwoofer.” Another surround option is Dolby Surround, with four channels (left, center, right, surround). But not all AC-3 audio is 5.1 surround sound. Dolby Digital Professional is commonly used to encode stereo files to greatly reduce their file size.

See Adding Surround Sound Source Media Files to Batches for more information about creating surround sound audio files using other output formats.

Note: It’s important to understand that Compressor cannot take stereo audio files and create 5.1 surround sound from them. If you want to create a 5.1 surround sound AC-3 audio file, you must first create the six channels of audio it requires. This must be done using other applications outside Compressor.