Function av_probe_input_format2

pub unsafe extern "C" fn av_probe_input_format2(
    pd: *mut AVProbeData,
    is_opened: c_int,
    score_max: *mut c_int,
) -> *mut AVInputFormat

Guess the file format.

@param pd data to be probed @param is_opened Whether the file is already opened; determines whether demuxers with or without AVFMT_NOFILE are probed. @param score_max A probe score larger that this is required to accept a detection, the variable is set to the actual detection score afterwards. If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended to retry with a larger probe buffer.