clip_length.py

#how to get duration of the video in Ypth
#https://stackoverflow.com/a/36743499
#from pathlib import Path
import subprocess as sb
import json


def probe(vid_file_path):
    ''' Give a json from ffprobe command line

    @vid_file_path : The absolute (full) path of the video file, string.
    '''
    if type(vid_file_path) != str:
        raise Exception('Gvie ffprobe a full file path of the video')
        return

    command = ["ffprobe",
            "-loglevel",  "quiet",
            "-print_format", "json",
             "-show_format",
             "-show_streams",
             vid_file_path
             ]

    pipe = sb.Popen(command, stdout=sb.PIPE, stderr=sb.STDOUT)
    out, err = pipe.communicate()
    return json.loads(out)


def duration(vid_file_path):
    ''' Video's duration in seconds, return a float number
    '''
    _json = probe(vid_file_path)

    if 'format' in _json:
        if 'duration' in _json['format']:
            return float(_json['format']['duration'])

    if 'streams' in _json:
        # commonly stream 0 is the video
        for s in _json['streams']:
            if 'duration' in s:
                return float(s['duration'])

    # if everything didn't happen,
    # we got here because no single 'return' in the above happen.
    raise Exception('I found no duration')
    #return None