django-本地视频无法拖动进度条的解决方法

django-本地视频无法拖动进度条的解决方法

使用django的框架，发现用chrome浏览器时，video的进度无法拖动
总结网上的方法，发现使用StreamingHttpResponse可以解决此问题

StreamingHttpResponse是将文件内容进行流式传输。它将数据持续的传输，实现续点传输，还降低了内存的消耗。

修改了大神的代码，如下
解决方法：
HTML 部分：

  <video id="example" class="vjs-default-skin vjs-big-play-centered"  poster="{% static '/imgs/v1.jpg'%}" controls preload="auto" >
     <source style=" background:#000;" src="/video/stream_video"  type="video/mp4">
     <p class="vjs-no-js"> To view this video please enable JavaScript, and consider upgrading to a web browser</p>
  </video>

url.py 部分：

path('stream_video', stream_video, name='stream_video'),

app.py 部分：

from wsgiref.util import FileWrapper
from django.http import StreamingHttpResponse
import mimetypes

def file_iterator(file_name, chunk_size=8192, offset=0, length=None):
    with open(file_name, "rb") as f:
        f.seek(offset, os.SEEK_SET)
        remaining = length
        while True:
            bytes_length = chunk_size if remaining is None else min(remaining, chunk_size)
            data = f.read(bytes_length)
            if not data:
                break
            if remaining:
                remaining -= len(data)
            yield data

def stream_video(request):
    """ responds to the video file as """
    path='static/media/show.mp4'                 #此为我的视频路径
    range_header = request.META.get('HTTP_RANGE', '').strip()
    range_re = re.compile(r'bytes\s*=\s*(\d+)\s*-\s*(\d*)', re.I)
    range_match = range_re.match(range_header)
    size = os.path.getsize(path)
    content_type, encoding = mimetypes.guess_type(path)
    content_type = content_type or 'application/octet-stream'
    if range_match:
        first_byte, last_byte = range_match.groups()
        if first_byte:
            first_byte = int(first_byte)
        else:
             first_byte = 0
        last_byte = first_byte + 1024 * 1024 * 8 # 8M per piece, the maximum volume of the response body
        if last_byte > size:
            last_byte = size - 1
        length = last_byte - first_byte + 1
        resp = StreamingHttpResponse(file_iterator(path, offset=first_byte, length=length), status=206, content_type=content_type)
        resp['Content-Length'] = str(length)
        resp['Content-Range'] = 'bytes %s-%s/%s' % (first_byte, last_byte, size)
    else:
                 # When the video stream is not obtained, the entire file is returned in the generator mode to save memory.
        resp = StreamingHttpResponse(FileWrapper(open(path, 'rb')), content_type=content_type)
        resp['Content-Length'] = str(size)
    resp['Accept-Ranges'] = 'bytes'
    return resp

当然也可以写成def stream_video(request，path):再引入path
用以上方法即可解决进度条无法拖动的问题