Django视频文件

如何解决Django视频文件

尝试在帖子中显示视频时遇到问题。它不会显示

HTML文件

               {% if post.video %}
                <video width="400" height="300" controls >
                <source src={{post.video.url}}" type="video/mp4" >
                </video>
                {% endif %}

Models.py

class Post(models.Model):
    title = models.CharField(max_length = 100)
    content = models.TextField()
    date_posted = models.DateTimeField(default = timezone.Now )
    #one user can have multiple posts,but one post can only have one author
    author = models.ForeignKey(User,on_delete = models.CASCADE)
    image = models.ImageField(blank = True,null=True,upload_to='post-images')
    video = models.FileField(blank=True,upload_to='post-images')

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('blog-home')

我该如何解决