Function rsmpeg::ffi::av_log_once

pub unsafe extern "C" fn av_log_once(
    avcl: *mut c_void, 
    initial_level: i32, 
    subsequent_level: i32, 
    state: *mut i32, 
    fmt: *const i8,
     ...
)

Send the specified message to the log once with the initial_level and then with the subsequent_level. By default, all logging messages are sent to stderr. This behavior can be altered by setting a different logging callback function. @see av_log

@param avcl A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct or NULL if general log. @param initial_level importance level of the message expressed using a @ref lavu_log_constants “Logging Constant” for the first occurance. @param subsequent_level importance level of the message expressed using a @ref lavu_log_constants “Logging Constant” after the first occurance. @param fmt The format string (printf-compatible) that specifies how subsequent arguments are converted to output. @param state a variable to keep trak of if a message has already been printed this must be initialized to 0 before the first use. The same state must not be accessed by 2 Threads simultaneously.