media/convert.py

import io
from media import common, logger
from PIL import Image
import subprocess
import platform


def get_pil_image(media_instance):
    try:
        media_instance = media_instance._im
    except AttributeError:
        pass
    #
    if type(media_instance) == str:
        ft = common.get_filetype(media_instance)
        if ft == common.FILETYPE_IMAGE:
            return Image.open(media_instance)
        elif ft == common.FILETYPE_VIDEO:
            if platform.system() == 'Linux':
                cmd = 'ffmpeg -ss 0.5 -i "' + media_instance + '" -vframes 1 -f image2pipe pipe:1 2> /dev/null'
            else:
                cmd = 'ffmpeg -ss 0.5 -i "' + media_instance + '" -vframes 1 -f image2pipe pipe:1 2> NULL'
            try:
                data = subprocess.check_output(cmd, shell=True)
            except subprocess.CalledProcessError:
                logger.warning('ffmpeg seems to be not installed')
                return None
            ffmpeg_handle = io.BytesIO(data)
            im = Image.open(ffmpeg_handle)
            return im.copy()
        logger.warning('Filetype is not supported (%s)', media_instance)
    elif type(media_instance) == Image.Image:
        return media_instance.copy()
    else:
        logger.warning('Instance type is not supported: %s' % type(media_instance))