Combinations of input and output codec

The possible input and output codec combinations (in which at least one codec is a Dolby codec) are as follows. All these combinations support including metadata in the output.

Input codec	Output codec
Dolby Digital or Dolby Digital Plus	Dolby Digital or Dolby Digital Plus
Dolby Digital	Dolby Digital Passthrough (so Dolby Digital audio is passed through; it is not transcoded)
Dolby Digital Plus	Dolby Digital Passthrough (so Dolby Digital Plus audio is passed through; it is not transcoded)
Mix of Dolby Digital Plus and another codec	Dolby Digital Plus (with the Automatic Passthrough field checked)
Dolby E	Dolby Digital
Dolby E	Dolby Digital Plus
Dolby E	Dolby E (passthrough )
A non-Dolby codec	Dolby Digital or Dolby Digital Plus

The sample rate when encoding with a Dolby codec is always 48000.