I am trying to capture a live stream from a GoPro using cv2 in python with the following code:
VIDEO_URL = "http://10.5.5.9:8080/live/amba.m3u8"
cam = cv2.VideoCapture(VIDEO_URL)
cv2.namedWindow("GoPro",cv2.CV_WINDOW_AUTOSIZE)
while True:
f, im = cam.read()
cv2.imshow("GoPro",im)
if cv2.waitKey(5) == 27:
break
cam.release()
cv2.destroyAllWindows()
but receive the following errors:
WARNING: Couldn't read movie file http://10.5.5.9:8080/live/amba.m3u8
OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file /tmp/opencv-MRl1/opencv-2.4.7.1/modules/highgui/src/window.cpp, line 261
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "gopro_simple.py", line 167, in live_stream
cv2.imshow("GoPro",im)
cv2.error: /tmp/opencv-MRl1/opencv-2.4.7.1/modules/highgui/src/window.cpp:261: error: (-215) size.width>0 && size.height>0 in function imshow
The stream works in vlc, and the code works with a webcam, so it looks like the problem is that opencv doesn't like the .m3u8 format. Any ideas / suggestions of how to fix this would be greatly appreciated. Thanks.
Found a solution which calls ffmpeg here - works great (with a couple of small alterations to the ffmpeg options):
VIDEO_URL = WEBURL + "live/amba.m3u8"
cv2.namedWindow("GoPro",cv2.CV_WINDOW_AUTOSIZE)
pipe = sp.Popen([ FFMPEG_BIN, "-i", VIDEO_URL,
"-loglevel", "quiet", # no text output
"-an", # disable audio
"-f", "image2pipe",
"-pix_fmt", "bgr24",
"-vcodec", "rawvideo", "-"],
stdin = sp.PIPE, stdout = sp.PIPE)
while True:
raw_image = pipe.stdout.read(432*240*3) # read 432*240*3 bytes (= 1 frame)
image = numpy.fromstring(raw_image, dtype='uint8').reshape((240,432,3))
cv2.imshow("GoPro",image)
if cv2.waitKey(5) == 27:
break
cv2.destroyAllWindows()
Still tinkering with the code so any suggestions welcome.