The video capture API includes constants that specify the video capture debugging properties.
#define CAPTURE_PROPERTY_VERBOSITY CAPTURE_PROPERTY( 'Q', 'V', 'B', 'R' )
Log verbosity level.
Default is 0; increase this value to increase log verbosity for debugging.
Read/Write uint32_t
#define CAPTURE_PROPERTY_VERBOSITY_FILE CAPTURE_PROPERTY('Q','V','B','F')
File log messages are written to.
Default is stderr; A NULL pointer disables logging.
Read/Write FILE*
#define CAPTURE_PROPERTY_LOGMSG_PREFIX CAPTURE_PROPERTY('Q','L','M','P')
User-defined string that log messages will be prefixed with.
Read/Write char*