使用Flask流式传输视频文件 [英] Streaming video files using Flask
问题描述
请帮助我了解一下.
我正在尝试让Flask播放.mp4视频.我知道我可以使用 Response(generator_function())
I am trying to make Flask to stream .mp4 video. I know that i can use Response(generator_function())
但是在浏览器中观看视频时不允许跳至特定的分钟.
But it does not allow to jump to specific minute while watching a video in browser.
所以我正在尝试使用 Range 标头.这是我的尝试方式:
So i am trying to use Range header. Here is how i try it:
app = Flask(__name__)
def get_chunk(byte1=None, byte2=None):
filesize = os.path.getsize('try2.mp4')
yielded = 0
yield_size = 1024 * 1024
if byte1 is not None:
if not byte2:
byte2 = filesize
yielded = byte1
filesize = byte2
with open('try2.mp4', 'rb') as f:
content = f.read()
while True:
remaining = filesize - yielded
if yielded == filesize:
break
if remaining >= yield_size:
yield content[yielded:yielded+yield_size]
yielded += yield_size
else:
yield content[yielded:yielded+remaining]
yielded += remaining
@app.route('/')
def get_file():
filesize = os.path.getsize('try2.mp4')
range_header = flask_request.headers.get('Range', None)
if range_header:
byte1, byte2 = None, None
match = re.search(r'(\d+)-(\d*)', range_header)
groups = match.groups()
if groups[0]:
byte1 = int(groups[0])
if groups[1]:
byte2 = int(groups[1])
if not byte2:
byte2 = byte1 + 1024 * 1024
if byte2 > filesize:
byte2 = filesize
length = byte2 + 1 - byte1
resp = Response(
get_chunk(byte1, byte2),
status=206, mimetype='video/mp4',
content_type='video/mp4',
direct_passthrough=True
)
resp.headers.add('Content-Range',
'bytes {0}-{1}/{2}'
.format(byte1,
length,
filesize))
return resp
return Response(
get_chunk(),
status=200, mimetype='video/mp4'
)
@app.after_request
def after_request(response):
response.headers.add('Accept-Ranges', 'bytes')
return response
get_chunk (如果指定了此字节)从字节1到字节2生成块,否则从0生成文件大小(块大小= 1MB).
get_chunk yields chunks from byte1 to byte2 if this bytes are specified, and from 0 to filesize otherwise (chunk size = 1MB).
但是它不起作用.我看到,首先浏览器发送状态为< 200>的请求.然后使用< 206>.请告诉我如何使它工作.
But it does not work. I see that firstly browser sends request with <200> status. And then with <206>. Please advice me how to make it working.
推荐答案
在开发服务器上,您需要启用 threaded = True
才能使视频流正常工作.
On development server you need to enable threaded=True
for video stream to work correctly.
已更新:
@app.after_request
def after_request(response):
response.headers.add('Accept-Ranges', 'bytes')
return response
def get_chunk(byte1=None, byte2=None):
full_path = "try2.mp4"
file_size = os.stat(full_path).st_size
start = 0
if byte1 < file_size:
start = byte1
if byte2:
length = byte2 + 1 - byte1
else:
length = file_size - start
with open(full_path, 'rb') as f:
f.seek(start)
chunk = f.read(length)
return chunk, start, length, file_size
@app.route('/video')
def get_file():
range_header = request.headers.get('Range', None)
byte1, byte2 = 0, None
if range_header:
match = re.search(r'(\d+)-(\d*)', range_header)
groups = match.groups()
if groups[0]:
byte1 = int(groups[0])
if groups[1]:
byte2 = int(groups[1])
chunk, start, length, file_size = get_chunk(byte1, byte2)
resp = Response(chunk, 206, mimetype='video/mp4',
content_type='video/mp4', direct_passthrough=True)
resp.headers.add('Content-Range', 'bytes {0}-{1}/{2}'.format(start, start + length - 1, file_size))
return resp
if __name__ == '__main__':
app.run(threaded=True)
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