I'm stuck at audio..
Is there any easy way to put that two together?
Do I have to sync them both or can I somehow just extract audio to the existing code? :/
I'm new in python :P
My code:
import cv2
import numpy as np
file_name = "path to video"
window_name = "window"
interframe_wait_ms = 30
cap = cv2.VideoCapture(file_name)
if not cap.isOpened():
exit()
cv2.namedWindow(window_name, cv2.WND_PROP_FULLSCREEN)
cv2.setWindowProperty(window_name, cv2.WND_PROP_FULLSCREEN, cv2.WINDOW_FULLSCREEN)
while (True):
ret, frame = cap.read()
if ret:
cv2.imshow(window_name, frame)
else:
cap.set(cv2.CAP_PROP_POS_FRAMES, 0)
if cv2.waitKey(interframe_wait_ms) & 0x7F == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
Nevermind, i resolved this using ffpyplayer, but i still have problems when video reloads, music is bugged
Related
I want to run some mp4 videos inside a process but only camera feed works. The software gets stuck with no error message. I already tried both and I found this doesn't run. The print is where the code gets stuck.
import cv2
import multiprocessing
dispW=640
dispH=480
# Camera inputs
cap=cv2.VideoCapture('/home/kc/Downloads/darknet/1.mp4')
cap.set(cv2.CAP_PROP_FRAME_WIDTH, dispW)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, dispH)
#cv2.namedWindow("Window")
def c1():
global cap
while True:
print('here')
success, img = cap.read()
#ret, frame1 = cap1.read()
#frame2 = numpy.hstack((frame,frame1))
print('here')
cv2.imshow("Window2", img)
#This breaks on 'q' key
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
tCap1 = multiprocessing.Process(target=c1)
tCap1.start()
this runs.
import cv2
import multiprocessing
dispW=640
dispH=480
# Camera inputs
cap=cv2.VideoCapture('/dev/video0')
cap.set(cv2.CAP_PROP_FRAME_WIDTH, dispW)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, dispH)
#cv2.namedWindow("Window")
def c1():
global cap
while True:
success, img = cap.read()
#ret, frame1 = cap1.read()
#frame2 = numpy.hstack((frame,frame1))
print('here')
cv2.imshow("Window2", img)
#This breaks on 'q' key
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
tCap1 = multiprocessing.Process(target=c1)
tCap1.start()
I need an example of mp4 file run in a multiprocessing way.
Here's a minimal working example with optional FPS control. If you need to extract frames from your process back to the main program, you can use multiprocessing.Queue() to transfer frames since multiprocesses have an independent memory stack.
import multiprocessing as mp
import cv2, time
def capture_frames():
src = 'test.mp4'
capture = cv2.VideoCapture(src)
capture.set(cv2.CAP_PROP_BUFFERSIZE, 2)
# FPS = 1/X, X = desired FPS
FPS = 1/120
FPS_MS = int(FPS * 1000)
while True:
# Ensure camera is connected
if capture.isOpened():
(status, frame) = capture.read()
# Ensure valid frame
if status:
cv2.imshow('frame', frame)
else:
break
if cv2.waitKey(1) & 0xFF == ord('q'):
break
time.sleep(FPS)
capture.release()
cv2.destroyAllWindows()
if __name__ == '__main__':
print('Starting video stream')
capture_process = mp.Process(target=capture_frames, args=())
capture_process.start()
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I am beginner in CV. My camera crash every time.
I mean camera light is ON but the there is no camera display
Could someone help me?
Here is the code
import cv2 as cv
import numpy as np
cap=cv.VideoCapture(0)
# read webcam untill the end
while (cap.isOpened()):
# capture frame by frame
ret,frame=cap.read()
if ret == True:
# to display frame
cv.imshow("Frame",frame)
else:
break
cv.waitKey(1)
cap.release()
cv.destroyAllWindows()
i think you put waitKey in wrong place, I hope below code will work !
import cv2 as cv
cap = cv.VideoCapture(0)
# read webcam untill the end
while (cap.isOpened()):
# capture frame by frame
ret, frame = cap.read()
if ret == True:
# to display frame
cv.imshow("Frame", frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
break
cap.release()
cv.destroyAllWindows()
#tahir mehmood. I modified your code, and I tested it. Worked well.
import cv2 as cv
import numpy as np
cap=cv.VideoCapture(0)
# read webcam untill the end
while (cap.isOpened()):
# capture frame by frame
ret,frame=cap.read()
if not ret:
break
cv.imshow("Frame",frame)
cv.waitKey(1)
cap.release()
cv.destroyAllWindows()
so I found this code somewhere and I tried running it:
import cv2
from ffpyplayer.player import MediaPlayer
video_path = "video.mp4"
def video_audio(path):
video = cv2.VideoCapture(video_path)
player = MediaPlayer(video_path)
while True:
ret, frame = video.read()
audio_frame, val = player.get_frame()
if not ret:
print("End of video")
break
if cv2.waitKey(28) & 0xFF == ord("q"):
break
cv2.imshow("Video", frame)
if val != 'eof' and audio_frame is not None:
# audio
img, t = audio_frame
video.release()
cv2.destroyAllWindows()
video_audio(video_path)
it does actually play the video and audio, but there is a delay between the two (current audio frame is played ahead of the current video frame)
does anyone know a possible solution to fix that?
I'm simply trying to get the image of my webcam in python with OpenCV 4.2.0 (on Spyder - python 3.7 running on windows 10). I just copy-pasted the code of the OpenCV documentation (see below) and most of the time it prints: "Can't receive frame (stream end?). Exiting ..."
So I know the error comes from: ret, frame = cap.read(). But I don't know how to fix this.
Sometimes it prints: "Cannot open camera" and then it exits the Spyder Console and starts a new one
And sometimes it just works great...
Can anyone help?
Here is my code:
import numpy as np
import cv2 as cv
cap = cv.VideoCapture(0)
if not cap.isOpened():
print("Cannot open camera")
exit()
while True:
# Capture frame-by-frame
ret, frame = cap.read()
# if frame is read correctly ret is True
if not ret:
print("Can't receive frame (stream end?). Exiting ...")
break
# Our operations on the frame come here
gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
# Display the resulting frame
cv.imshow('frame', gray)
if cv.waitKey(1) == ord('q'):
break
# When everything done, release the capture
cap.release()
cv.destroyAllWindows()
Added the last line to close the window
I had a similar issue (now for a while). I run Linux, not Windows. I read video feeds from multiple IP cameras, not just one webcam. But I believe the solution would be the same. In my opinion, it looks as if the feed, or OpenCv stops supplying frames. So I simply recreate cap, test ret, and move on. This will create a endless loop, it will never stop. In my scenario this correct. I want to real all frames, all the time.
It will look something like:
import numpy as np
import cv2 as cv
cap = cv.VideoCapture('rtsp://1.2.3.4:554//Streaming/Channels/1')
if not cap.isOpened():
print("Cannot open camera")
exit()
while True:
# Capture frame-by-frame
ret, frame = cap.read()
# if frame is read correctly ret is True
while ret == False:
print("Can't receive frame. Retrying ...")
cap.release()
cap = cv.VideoCapture('rtsp://1.2.3.4:554//Streaming/Channels/1')
ret, frame = cap.read()
# Our operations on the frame come here
gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
print('frame')
# Display the resulting frame
cv.imshow('frame', gray)
if cv.waitKey(1) == ord('q'):
break
# When everything done, release the capture
cap.release()
cv.destroyAllWindows()
import numpy as np
import cv2 as cv
cap = cv.VideoCapture(0)# In place of zero we gonna use path of the video file.
while cap.isOpened():
# Capture frame-by-frame
ret, frame = cap.read()
# if frame is read correctly ret is True
if ret:
# Our operations on the frame come here
gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
# Display the resulting frame
cv.imshow('frame', gray)
if cv.waitKey(1) == ord('q'):
break
else:
print("camer not streaming")
# When everything done, release the capture
cap.release()
cv.destroyAllWindows()
I tried as given in the to tutorial, but I am not able to open the video. I guess there is some problem with the fourcc thing in OpenCV-Python. My code was as follows:
import numpy as np
import cv2
cap = cv2.VideoCapture(0)
#fourCc = cv.VideoWriter_fourcc(*'XVID')
fourCc = cv2.VideoWriter_fourcc('X','V','I','D')
out = cv2.VideoWriter('output.avi',fourCc,20.0,(640,480))
while(cap.isOpened()):
ret, frame = cap.read()
if ret==True:
frame = cv2.flip(frame,0)
out.write(frame)
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
break
cap.release()
out.release()
cv2.destroyAllWindows()
It does create a file named output.avi (of non-zero size), but I am not able to play it, even using VLC.
NOTE: The same thing in C++ is working fine