I am beginner in python and also in opencv. I want to take video of some interval with opencv videocapture function let say 10 seconds and then system should go to sleep mode for some time let say for 6 seconds .then it takes video of 10 second .Both video should be saved in separate file.my problem is that when i call first function it save the first video but on call of video2 function it doesn't save the video.sorry for bad arrangement of code . i am new user to so.
import cv2
import time
def delay(delay_time):
timeout = delay_time # [seconds]
timeout_start = time.time()
print(time.strftime("%c"))
while time.time() < timeout_start + timeout:
test = 0
if test == 3:
break
test -= 1
print(time.strftime("%c"))
def video1():
cap = cv2.VideoCapture(0)
if (cap.isOpened() == False):
print("Unable to read camera feed")
frame_width = int(cap.get(3))
frame_height = int(cap.get(4))
out = cv2.VideoWriter('Data/output1.avi',
cv2.VideoWriter_fourcc('M', 'J', 'P', 'G'), 10, (frame_width, frame_height))
while time.time() < time_start + closing_time:
ret, frame = cap.read()
if ret == True:
out.write(frame)
cv2.imshow('frame', frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
break
cap.release()
out.release()
def video2():
cap = cv2.VideoCapture(0)
if (cap.isOpened() == False):
print("Unable to read camera feed")
frame_width = int(cap.get(3))
frame_height = int(cap.get(4))
out = cv2.VideoWriter('Data/output2.avi',
cv2.VideoWriter_fourcc('M', 'J', 'P', 'G'), 10, (frame_width, frame_height))
while time.time() < time_start + closing_time:
ret, frame = cap.read()
if ret == True:
out.write(frame)
cv2.imshow('frame', frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
break
cap.release()
out.release()
cv2.destroyAllWindows()
cv2.destroyAllWindows()
print(time.strftime("%c"))
video1()
delay(6)
print(time.strftime("%c"))
video2()
Your code has so many indentation problems that I can't even point to 1 location and say this is a problem. So I rearranged your code here. Also you didn't even define time_start or closing_time in your code. But I'm assuming your real code has them and the problem is just the second video not outputting right. Well that is because you have to define time_start in the beginning of video1 and video2. If you don't re-define time_start, by the time you get to video2 this while time.time() < time_start + closing_time: has already been exhausted and will be False. So no real video is being written to file.
import cv2
import time
def delay(delay_time):
timeout = delay_time # [seconds]
timeout_start = time.time()
print(time.strftime("%c"))
while time.time() < timeout_start + timeout:
test = 0
if test == 3:
break
test -= 1
print(time.strftime("%c"))
def video1():
time_start = time.time()
cap = cv2.VideoCapture(0)
if (cap.isOpened() == False):
print("Unable to read camera feed")
frame_width = int(cap.get(3))
frame_height = int(cap.get(4))
print(frame_width,frame_height)
out = cv2.VideoWriter('output1.avi',
cv2.VideoWriter_fourcc('M', 'J', 'P', 'G'), 10, (frame_width, frame_height))
while time.time() < time_start + closing_time:
ret, frame = cap.read()
if ret == True:
out.write(frame)
#cv2.imshow('frame', frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
break
cap.release()
out.release()
def video2():
time_start = time.time()
cap = cv2.VideoCapture(0)
if (cap.isOpened() == False):
print("Unable to read camera feed")
frame_width = int(cap.get(3))
frame_height = int(cap.get(4))
print(frame_width,frame_height)
out = cv2.VideoWriter('output2.avi',
cv2.VideoWriter_fourcc('M', 'J', 'P', 'G'), 10, (frame_width, frame_height))
while time.time() < time_start + closing_time:
ret, frame = cap.read()
if ret == True:
out.write(frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
break
cap.release()
out.release()
print(time.strftime("%c"))
closing_time = 10
video1()
delay(6)
print(time.strftime("%c"))
video2()
# this loop is here because sometimes cv2 has problems destroying windows
# if you call it once. so to be safe I call it 10 times
for _ in range(10):
cv2.destroyAllWindows()
This should do the trick it does what you asked in the question, the code is below:
`
import cv2
import time
import numpy as np
cap=cv2.VideoCapture(0)
fourcc=cv2.VideoWriter_fourcc(*'XVID')
out=cv2.VideoWriter('output1.avi', fourcc, 20.0, (640, 48))
start_time=time.time()
while True:
ret, frame=cap.read()
out.write(frame)
cv2.imshow('frame', frame)
if time.time()-start_time>=10:
break
cap.release()
out.release()
time.sleep(6)
cap2=cv2.VideoCapture(0)
fourcc2=cv2.VideoWriter_fourcc(*'XVID')
out2=cv2.VideoWriter('output2.avi', fourcc2, 20.0, (640, 48))
start_time2=time.time()
while True:
ret, frame=cap2.read()
out2.write(frame)
cv2.imshow('frame', frame)
if time.time()-start_time2>=10:
break
cap2.release()
out.release()
`
Related
Before the rstp ip camera I didnt faced with this problem.
Firstly I show downcounting(3-2-1-GO!) to user and than I start recording in only 10 seconds. After that record fnished and show the Fnished. But when I start using RSTP camera, I have time lag in record moments how can I solve this ? But in the webcam I dont have this problem.
Process:
DownCount 3-2-1-GO!
Start Recording in 10 second --I have problem this step, video record have time lag.
Show Fnished Text
This is source code
class MainRecord():
def __init__(self, rfidCode):
TIMER = int(3)
TIMER_RECORD = int(10)
self.rfidCode = rfidCode
print(self.rfidCode)
user_id = str(self.rfidCode) # this id will get from RFID
# user_id = "a1"
# test = 'fourth'q
# cap = cv2.VideoCapture(0)
# cap.set(cv2.CAP_PROP_BUFFERSIZE, 1)
# cap.set(cv2.CAP_PROP_POS_AVI_RATIO, 1)
cap = cv2.VideoCapture('rtsp://private:private#192.168.1.64/1')
# segmentor = SelfiSegmentation()
filename = user_id +'.avi' #.avi .mp4
frames_per_seconds = 24 #this is the standart for the movie or films
config = CFEVideoConf(cap, filepath = filename, res='1080p')
out = cv2.VideoWriter(filename, config.video_type, frames_per_seconds,config.dims)
img_path = 'ap_logo.png'
logo = cv2.imread(img_path,-1)
watermark = image_resize(logo, height=60)
watermark = cv2.cvtColor(watermark, cv2.COLOR_BGR2BGRA)
#grayscale watermark
# cv2.imshow('watermark',watermark)
# time.sleep(2)
font = cv2.FONT_HERSHEY_SIMPLEX
ret, readBefore = cap.read()
cv2.imshow('Start', readBefore)
while(True):
prev = time.time()
while TIMER >= 0:
ret, img = cap.read()
print("showing")
# Display countdown on each frame
# specify the font and draw the
# countdown using puttext
if TIMER != 0:
cv2.putText(img, str(TIMER),
(560, 250), font,
7, (0, 255, 255),
4, cv2.LINE_AA)
cv2.imshow('Start', img)
else:
cv2.putText(img, str("GO!"),
(580, 250), font,
7, (0, 255, 255),
4, cv2.LINE_AA)
cv2.imshow('Start', img)
if cv2.waitKey(20) & 0xFF == ord('q'):
break
# current time
cur = time.time()
# Update and keep track of Countdown
# if time elapsed is one second
# than decrease the counter
if cur - prev >= 1:
prev = cur
TIMER = TIMER - 1
if TIMER == -1:
cv2.destroyAllWindows()
while TIMER_RECORD >= 0: #problem occurs here !!
ret, frame = cap.read()
frame = cv2.cvtColor(frame, cv2.COLOR_BGR2BGRA)
frame_h,frame_w, frame_c = frame.shape
#overlay with 4 channel BGR and Alpha
overlay = np.zeros((frame_h, frame_w,4), dtype='uint8')
# overlay[100:250, 100:125] = (255,255,0,1) #B,G,R,A
# overlay[100:250, 150:255] = (0,255,0,1)
watermark_h, watermark_w, watermark_c = watermark.shape
for i in range(0, watermark_h):
for j in range(0, watermark_w):
if watermark[i,j][3] != 0:
h_offset = frame_h - watermark_h
w_offset = frame_w - watermark_w
overlay[h_offset+i,w_offset+j] = watermark[i,j]
cv2.addWeighted(overlay, 0.25, frame, 1.0, 0, frame)
#Display the resulting frame
frame = cv2.cvtColor(frame, cv2.COLOR_BGRA2BGR)
cv2.imshow('Frame', frame)
if cv2.waitKey(20) & 0xFF == ord('q'):
break
out.write(frame) #file a ilgili frame yazılıyor
cur = time.time()
# Update and keep track of Countdown
# if time elapsed is one second
# than decrease the counter
if cur - prev >= 1:
prev = cur
TIMER_RECORD = TIMER_RECORD - 1
print(TIMER_RECORD)
if TIMER_RECORD == -1:
cv2.destroyAllWindows()
# if cv2.waitKey(20) & 0xFF == ord('q'):
# break
else:
ret, finishImg = cap.read()
cv2.putText(finishImg, str("FINISH !"),
(150, 250), font,
7, (0, 255, 255),
4, cv2.LINE_AA)
cv2.imshow('Finished', finishImg)
# cv2.destroyAllWindows()
if cv2.waitKey(20) & 0xFF == ord('q'):
break
# break
# if cv2.waitKey(20) & 0xFF == ord('q'):
# break
#When everything done, relase the capture
cap.release()
out.release()
# saved
cv2.destroyAllWindows()
# self.ui.show()
In the while TIMER_RECORD >= 0: loop showing video is very slow but before and after everything is perfect. How can I solve this problem ?
I have been trying to capture a frame(screenshot) after every 5 seconds from a live .webm video stream which is constantly increasing in duration.
import cv2
import time
TIMER = int(5)
k=0
cap = cv2.VideoCapture('video.webm')
capture=int(1)
while True:
ret, img = cap.read()
cv2.imshow('a', img)
if ret:
prev = time.time()
while TIMER >= 0:
ret, img = cap.read()
font = cv2.FONT_HERSHEY_SIMPLEX
cv2.putText(img, str(TIMER),
(200, 250), font,
7, (0, 255, 255),
4, cv2.LINE_AA)
cv2.imshow('a', img)
cv2.waitKey(125)
cur = time.time()
if cur-prev >= 1:
prev = cur
TIMER = TIMER-1
if TIMER == 0:
ret, img = cap.read()
cv2.imshow('a', img)
cv2.waitKey(2000)
cv2.imwrite('camera' + str(capture) + '.jpg', img)
capture=capture+1
TIMER = int(5)
else:
break
cap.release()
cv2.destroyAllWindows()
Here my code captures the frame after every 5 frames, I'm not able to figure out the framerate calculation and making it work to capture frames after every 5 seconds rather than 5 frames.
If you want to utilize the fps information of the video an approach might be:
import cv2
cap = cv2.VideoCapture(r'path/to/vid')
fps = int(cap.get(cv2.CAP_PROP_FPS))
save_interval = 5
frame_count = 0
while cap.isOpened():
ret, frame = cap.read()
if ret:
frame_count += 1
if frame_count % (fps * save_interval) == 0:
cv2.imwrite(r'path/to/save/to')
# optional
frame_count = 0
# Break the loop
else:
break
cap.release()
cv2.destroyAllWindows()
I'm trying to get the current playing time position ( in milliseconds if possible) from a playing video using CV2 with Python.
Currently I'm using this sample code to play the video file
import cv2
import numpy as np
file_name = "2.mp4"
window_name = "window"
interframe_wait_ms = 30
cap = cv2.VideoCapture(file_name)
if not cap.isOpened():
print("Error: Could not open video.")
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 not ret:
print("Reached end of video, exiting.")
break
cv2.imshow(window_name, frame)
if cv2.waitKey(interframe_wait_ms) & 0x7F == ord('q'):
print("Exit requested.")
break
cap.release()
cv2.destroyAllWindows()
Is there a way to get this value or calculate it, it has to represent what's the position (in time, i.e 12.500 seconds of 24.000 seconds video) of the playback at the request time.
Thanks!
Yes, this can be achieved by querying the video FPS using VideoCapture.get(cv2.CAP_PROP_FPS) and keeping track of the frame index.
Example:
file_name = "2.mp4"
window_name = "window"
interframe_wait_ms = 30
cap = cv2.VideoCapture(file_name)
if not cap.isOpened():
print("Error: Could not open video.")
exit()
fps = cap.get(cv2.CAP_PROP_FPS)
cv2.namedWindow(window_name, cv2.WND_PROP_FULLSCREEN)
cv2.setWindowProperty(window_name, cv2.WND_PROP_FULLSCREEN, cv2.WINDOW_FULLSCREEN)
frame_index = 0
while True:
ret, frame = cap.read()
if not ret:
print("Reached end of video, exiting.")
break
cv2.imshow(window_name, frame)
print(F"playback time: {(frame_index/fps)*1000}ms")
if cv2.waitKey(interframe_wait_ms) & 0x7F == ord('q'):
print("Exit requested.")
break
frame_index += 1
cap.release()
cv2.destroyAllWindows()
I am trying to make my program take 8 pictures only when a key is pressed but I cant find a solution for it. I tried the keyboard package and whenever I would do key is pressed it would throw error.
By the way here is my code-
import numpy as np
import cv2
import time
cap = cv2.VideoCapture('morning.mp4')
img_counter = 0
start_time = time.time()
x=0
while(cap.isOpened()):
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame',gray)
if cv2.waitKey(47) & 0xFF == ord('q'):
break
#here is where the image capturing comes into play
if time.time() - start_time > 14: #<---- Check if 15 sec passed
img_name = "frame_{}.png".format(x)
cv2.imwrite(img_name, frame)
print("{} written!".format(img_counter))
start_time = time.time()
x += 1
img_counter += 1
if x == 8:
break
cap.release()
cv2.destroyAllWindows()
After the comment "#here is where the image capturing comes into play" until the break statement is where I take pictures of the video and I want to trigger that part of code with a keypress. Any idea how I should go about it?
The issue is that you break while loop after keypress. You should use some boolean variable to point when script should capture images.
Code:
import numpy as np
import cv2
import time
cap = cv2.VideoCapture('morning.mp4')
img_counter = 0
start_time = time.time()
x=0
capture_images = False
while(cap.isOpened()):
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame',gray)
if cv2.waitKey(47) & 0xFF == ord('q'):
capture_images = True
if capture_images:
#here is where the image capturing comes into play
if time.time() - start_time > 14: #<---- Check if 15 sec passed
img_name = "frame_{}.png".format(x)
cv2.imwrite(img_name, frame)
print("{} written!".format(img_counter))
start_time = time.time()
x += 1
img_counter += 1
if x == 8:
break
cap.release()
cv2.destroyAllWindows()
How do I get breaks during the image capture? In fact, I need 5sec in between the image.
This code captures around 15-20 images per sec, But I need to take a picture at an interval of 5sec in between images
import cv2
import time
import numpy
capture = cv2.VideoCapture(0)
capture.set(3,640)
capture.set(4,480)
img_counter = 0
frame_set = []
start_time = time.time()
while(True):
ret , frame = capture.read()
gray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
frame_set.append(gray)
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
end_time = time.time()
elapsed = end_time - start_time
img_name = "opencv_frame_{}.png".format(img_counter)
cv2.imwrite(img_name,frame)
print("{} written!".format(img_counter))
img_counter +=1
if elapsed > 1:
capture.release()
cv2.destroyAllWindows()
time.sleep(3)
You need an if statement to check if the desired time has passed. Using the already imported time package you can do this:
import cv2
import time
capture = cv2.VideoCapture(0)
capture.set(3, 640)
capture.set(4, 480)
img_counter = 0
frame_set = []
start_time = time.time()
while True:
ret, frame = capture.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame', gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
if time.time() - start_time >= 5: #<---- Check if 5 sec passed
img_name = "opencv_frame_{}.png".format(img_counter)
cv2.imwrite(img_name, frame)
print("{} written!".format(img_counter))
start_time = time.time()
img_counter += 1
The above script will save the frame in RGB every 5 seconds to the working directory.