About the Source Media Files
There are a few guidelines to be aware of when encoding Dolby Digital Professional
output files from your source media files.
Depending on the format, a file can contain a single channel (mono), dual channels
(stereo), or multiple channels. Compressor supports Dolby Digital Professional in all these
Sound files intended for Dolby Digital Professional encoding must conform to the following
• All source files should be the same length. (If they are not, Compressor sets the length
of the AC-3 stream to match the length of the longest file.)
• All files must have a 48 kHz sample rate (as required for DVD).
Creating Dolby Digital Professional Output Files
• AC-3 streams must have a multiple of 1536 samples. If the selected input files do not,
Compressor adds digital silence to the end of the files.
Note: Compressor can support any kind of source files that contain surround sound and
high resolution audio up to 64 bits per sample (floating point) and sample rates up to