Python: YouTube livestream not working with Streamlink

[devanshusharma19]

Expected behaviour

opencv working with youtube stream or youtube videos

Actual behaviour

actually it is not working it is showing error. I have tried on browser that link. It is working fine but in opencv is not working.

cv2.error: OpenCV(4.0.1) /io/opencv/modules/highgui/src/window.cpp:352: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'

Steps to reproduce

• example code

import streamlink
import cv2

url = 'https://www.youtube.com/watch?v=bZ6NL59FMoc'

streams = streamlink.streams(url)
print(streams)
#cap = cv2.VideoCapture(streams["360p"].url)
cap = cv2.VideoCapture(streams["best"].url)

while True:
    ret, frame = cap.read()
    print(frame)
    cv2.imshow('frame', frame)

    if cv2.waitKey(1) & 0xff == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

• operating system

Ubuntu 18.04

• architecture (e.g. x86)

64 bit
python 3.6

• opencv-python version

opencv-python version 4.0.1

[Sushanti99]

Hello @devanshusharma19
This code works perfectly for me on Windows.
You can try manually fixing the height and width of the frame on Ubuntu I guess.

[native-api]

Looks like a duplicate of #204

[fspider]

Hello
With some youtube videos,this code works.
But this code not works with youtube live stream.

https://www.youtube.com/watch?v=17Deeq8N2e4
https://www.youtube.com/watch?v=1y5dcfnv-Ss
https://www.youtube.com/watch?v=tbLXWVhu8-Q

1. Method
   vPafy = pafy.new(videoUrl)
   play = vPafy.getbest(preftype="mp4")
   return play.url

2. Method
   streams = streamlink.streams(videoUrl)
   return streams["best"].url

All 2 Method not works.

The error screen like this

[ERROR:0] global C:\projects\opencv-python\opencv\modules\videoio\src\cap.cpp (116) cv::VideoCapture::open VIDEOIO(CV_IMAGES): raised OpenCV exception:

OpenCV(4.1.1) C:\projects\opencv-python\opencv\modules\videoio\src\cap_images.cpp:235: error: (-5:Bad argument) CAP_IMAGES: error, expected '0?[1-9][du]' pattern, got: https://manifest.googlevideo.com/api/manifest/hls_playlist/expire/1574433696/ei/QJ_XXfqBHNOTgQOBqpGwBw/ip/222.112.215.2/id/1EiC9bvVGnk.1/itag/96/source/yt_live_broadcast/requiressl/yes/ratebypass/yes/live/1/goi/160/sgoap/gir%3Dyes%3Bitag%3D140/sgovp/gir%3Dyes%3Bitag%3D137/hls_chunk_host/r5---sn-3u-bh2ll.googlevideo.com/playlist_type/DVR/initcwndbps/7760/mm/44/mn/sn-3u-bh2ll/ms/lva/mv/m/mvi/4/pl/23/dover/11/keepalive/yes/fexp/23842630/mt/1574412027/sparams/expire,ei,ip,id,itag,source,requiressl,ratebypass,live,goi,sgoap,sgovp,playlist_type/sig/ALgxI2wwRAIgG6xA4SgrD4PZGAfyup1jpL003-U3CQomrURDSKrCbZQCIElX0iQYvSGuZK-aoDsbY9Zv6SVTCNHOXGoUXhPCj0bN/lsparams/hls_chunk_host,initcwndbps,mm,mn,ms,mv,mvi,pl/lsig/AHylml4wRQIhAO1AS0iv1JaOu9igx-i3uGV-52UNCvd1Kd4Fu9SSC6OqAiAVjNjYYdr37w4Id111zdRsu8csAkIAfynBOk4SEO9f3w%3D%3D/playlist/index.m3u8 in function 'cv::icvExtractPattern'

Traceback (most recent call last):
File "D:/VideoFeedProcessing/VideoFeed/main.py", line 226, in
out = cv.VideoWriter('_output.avi', fourcc, 15, (ori_wid, ori_hei))
TypeError: must be real number, not tuple
[tcp @ 000001601c64fbc0] Connection to tcp://manifest.googlevideo.com:443 failed: Error number -138 occurred

[abhiTronix]

@fspider This issue is not related to opencv-python as it not provide support for directly playing live-streaming youtube videos URLs. You can try another vidgear python video processing library for this purpose and the complete example code can be found here. Goodluck.