pid

The pid field is used in conjunction with the caption selector languageCode field as follows: - Specify PID and Language: Extracts captions from that PID; the language is "informational". - Specify PID and omit Language: Extracts the specified PID. - Omit PID and specify Language: Extracts the specified language, whichever PID that happens to be. - Omit PID and omit Language: Valid only if source is DVB-Sub that is being passed through; all languages will be passed through.