python multi-ffmpeg.py (-h/help) (-i/input-file) (-s/slicer)
                       (-c/converter) (-q/queue-length)
                       (-a/arguments) (-f/full_command)
                       (-d/delete-temp) (-t/segment-time)

-h: Default: None
    Print this usage file.

-i: Default: None
    The input file.
    Please make sure it can be read by ffmpeg.
    
-s: Default: 3
    The thread number of Slicer that cut the file into loseless pieces.

-c: Default: 3 
    The thread number of Converter that convert the file into pieces.
    
-q: Default: 10
    Max pieces.

-a: Default: None
    The arguments you want to pass to ffmpeg when encoding.
    
-f: Default: None
    In case you want something special, just input whatever command you want here!
    To make sure the command can be read,
    use {INPUT_SEGMENT_FILE}, {OUPUT_SEGMENT_FILE} in the command line.
    
-d: Default: 1
    If set to 0, Parallel-Transcode will not delete any temporary files.
    1: Only delete at the end of stage.
    2: Delete on the fly.

-t: Default: 30
    The time of one segment in sec.
       
-v: Default: (Blank)
    The temporary file's format.
    If set to "avc", Parallel-Transcode will use a *loseless* way to transcode file to reserve its quality.
    It not set, the temporary file would be in MPEG2, same quality. There's no guarantee that this is loseless.
    
-r: Default: 15
    Used with "-v avc".
    The crf to use when convert.
    0 for loseless.

-n: Default: 0
    Dry run.
    Convert first N piece to test whether the script is running properly.