block9.python

def run_command(*popenargs, **kwargs):
    closeNULL = 0
    try:
        from subprocess import DEVNULL
        closeNULL = 0
    except ImportError:
        import os
        DEVNULL = open(os.devnull, 'wb')
        closeNULL = 1

    process = sp.Popen(stdout=sp.PIPE, stderr=DEVNULL, *popenargs, **kwargs)
    output, unused_err = process.communicate()
    retcode = process.poll()

    if closeNULL:
        DEVNULL.close()

    if retcode:
        cmd = kwargs.get("args")
        if cmd is None:
            cmd = popenargs[0]
        error = sp.CalledProcessError(retcode, cmd)
        error.output = output
        raise error
        
    return output

def ffprobe(filename, options = ["-show_error", "-show_format", "-show_streams", "-show_programs", "-show_chapters", "-show_private_data"]):
    ret = {}
    command = [FFMPEG_PATH + "/ffprobe", "-v", "error", *options, "-print_format", "json", filename]
    ret = run_command(command)
    if ret:
        ret = json.loads(ret)
    return ret

# ffmpeg -i input.mov -r 0.25 output_%04d.png
def ffextract_frames(filename, output_folder, rate = 0.25):
    command = [FFMPEG_PATH + "/ffmpeg", "-i", filename, "-r", str(rate), "-y", output_folder + "/output_%04d.png"]
    ret = run_command(command)
    return ret

# ffmpeg -i input-video.mp4 output-audio.mp3
def ffextract_audio(filename, output_path):
    command = [FFMPEG_PATH + "/ffmpeg", "-i", filename, "-vn", "-ac", "1", "-acodec", "copy", "-y", output_path]
    ret = run_command(command)
    return ret