видео с превью. превью с вимео или с ютуба или загружена через админку

py

def prevent_russian_file_for_video(instance, filename):
    return u"uploads/video/previews/%s" % (translify(filename),)

class Video(models.Model):
    STATUS_CHOICES = (
        (0, _('not published')),
        (1, _('published'))
    )
    title = models.CharField(max_length=255,
        verbose_name=_('title'))
    path = models.URLField(blank=True,
        verbose_name=_('link'))
    code = models.TextField(blank=True,
        verbose_name=_('embed code'))
    video_id = models.CharField(max_length=100, editable=False)
    type = models.PositiveSmallIntegerField(editable=False)
    status = models.PositiveSmallIntegerField(default=1, choices=STATUS_CHOICES,
         verbose_name=_('status'))
    order = models.PositiveSmallIntegerField(default=1,
        verbose_name=_('order'))
    width = models.PositiveIntegerField(verbose_name=_('width'), default=500)
    height = models.PositiveIntegerField(verbose_name=_('height'), default=400)

    img = models.ImageField(u'превью',upload_to=prevent_russian_file_for_video, blank=True )

    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField()
    content_object = generic.GenericForeignKey()

    def __unicode__(self):
        return self.title

    def get_preview(self):
        path = self.get_code()
        if self.img:        
            return [ '/media/uploads/video/previews/%s' % self.img, path, self.title ]
        if self.type == 2:
            url = 'http://vimeo.com/api/v2/video/' + self.video_id +'.xml'
            result = urllib.urlopen(url).read()
            if result > 0:
                b = result.find('thumbnail_medium')+17
                e = result.find('</thumbnail_medium')
                url = result[b:e]                        
        else:
            url = 'http://img.youtube.com/vi/' + self.video_id + '/0.jpg'            
        preview = [url, path, self.title]
        
        return preview

    def parse_path(self):
        if not self.code:
            if self.path:
                import re
                try:
                    youtube = re.search(r'youtube', self.path)
                    youtu = re.search(r'youtu\.be', self.path)
                    vimeo = re.search(r'vimeo', self.path)
                    id = 0
                    if youtube:
                        self.type = 1
                        m = re.search(r"v=([\w-]+)", self.path)
                        id = m.group(1)
                    if youtu:
                        self.type = 1
                        m = re.search(r"youtu\.be/([\w-]+)", self.path)
                        id = m.group(1)
                    if vimeo:
                        self.type = 2
                        m = re.search(r'([\d]+)', self.path)
                        id = m.group(1)
                    self.video_id = id
                except Exception:
                    self.video_id = 'unknown'
                    self.type = 0
            else:
                self.video_id = 'unknown'
                self.type = 0
        else:
            self.video_id = 'code'
            self.type = 0

    def get_code(self):
        if self.type == 2:
            return 'http://player.vimeo.com/video/' + self.video_id
        else:
            return 'http://www.youtube.com/embed/'+ self.video_id

    def save(self, *args, **kwargs):
        self.parse_path()
        super(Video, self).save(*args, **kwargs)

    class Meta:
        verbose_name=_('video')
        verbose_name_plural = _('video')