Function ffmpeg_dev::sys::av_probe_input_format

pub unsafe extern "C" fn av_probe_input_format(
    pd: *mut AVProbeData, 
    is_opened: 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.