get_video_info.py

''' Get video attributes and thumbnail '''

import tempfile
from subprocess import getstatusoutput


def get_video_attributes(file: str):
    ''' Returns video duration, width, height '''

    class FFprobeAttributesError(Exception):
        ''' Exception if ffmpeg fails to generate attributes '''

    cmd = "ffprobe -v error -show_entries format=duration " \
          + "-of default=noprint_wrappers=1:nokey=1 " \
          + "-select_streams v:0 -show_entries stream=width,height "\
          + f" -of default=nw=1:nk=1 {file}"
    res, out = getstatusoutput(cmd)
    if res != 0:
        raise FFprobeAttributesError(out)
    width, height, dur = out.split("\n")
    return (int(float(dur)), int(width), int(height))


def get_video_thumb(file: str):
    ''' Returns path to video thumbnail '''

    class FFprobeThumbnailError(Exception):
        ''' Exception if ffmpeg fails to generate thumbnail '''

    thumb_file = tempfile.NamedTemporaryFile(suffix=".jpg").name
    duration, width, height = get_video_attributes(file)
    dur = str(int(duration / 2))
    size = f"{width}x{height}"
    cmd = f"ffmpeg -v error -ss {dur} -i {file}  -vframes 1 " \
          + f"-s {size} {thumb_file}"
    res, out = getstatusoutput(cmd)
    if res != 0:
        raise FFprobeThumbnailError(out)
    return thumb_file