I was just trying to read frames from a file and rewriting it into a new file using opencv 3.4.5 in python. But it fails to create the video file .
import cv2
vidcap = cv2.VideoCapture('movie.mov')
success,image = vidcap.read()
height, width, channels = image.shape
print(channels)
video=cv2.VideoWriter('video.avi',-1,1,(width,height))
count = 0
images = []
while success:
images.append(image)
success,image = vidcap.read()
print('Read a new frame: ', success)
count += 1
if cv2.waitKey(1) & 0xFF == ord('q'):
break
print(count,len(images))
for i in images:
video.write(i)
cv2.destroyAllWindows()
video.release()
The problem is the way you declare the writer.
fps = int(cap.get(cv2.CAP_PROP_FPS))
size = (int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)),int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)))
fourcc = int(cv2.VideoWriter_fourcc('X','V','I','D')) # XVID codecs
writer = cv2.VideoWriter("new.avi", fourcc, fps, size)
Related
I am using the following Python code to extract frames from a video file. I know that the total number of frames in my video file is 4375, but only 1900 frames are extracted from this code. Is there something I am missing?
vidcap = cv2.VideoCapture("/path/to/video/file")
success,image = vidcap.read()
count = 0
while(success):
cv2.imwrite("/path/to/store/frames/frame%d.png" %count, image)
success,image = vidcap.read()
count += 1
I have tried many times unsuccessfully to change the framerate to make video slower like out = cv2.VideoWriter(fps=2.5) but generally, it doesn't perform slower why? Any idea to fix this problem? Also, I would appreciate that if anyone has a solution to convert directly pictures to gif
import cv2
import argparse
import os
# Construct the argument parser and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-ext", "--extension", required=False, default='png', help="extension name. default is 'png'.")
ap.add_argument("-o", "--output", required=False, default='output.mp4', help="output video file")
args = vars(ap.parse_args())
# Arguments
dir_path = '.'
ext = args['extension']
output = args['output']
images = []
for f in os.listdir(dir_path):
if f.endswith(ext):
images.append(f)
# Determine the width and height from the first image
image_path = os.path.join(dir_path, images[0])
frame = cv2.imread(image_path)
cv2.imshow('video',frame)
height, width, channels = frame.shape
# Define the codec and create VideoWriter object
fourcc = cv2.VideoWriter_fourcc(*'mp4v') # Be sure to use lower case
out = cv2.VideoWriter(output, fourcc, 1.5, (width, height))
for image in images:
image_path = os.path.join(dir_path, image)
frame = cv2.imread(image_path)
out.write(frame) # Write out frame to video
cv2.imshow('video',frame)
if (cv2.waitKey(1) & 0xFF) == ord('q'): # Hit `q` to exit
break
# Release everything if job is finished
out.release()
cv2.destroyAllWindows()
print("The output video is {}".format(output))
Use below code to convert images to a gif file:
import os
import imageio
dir_path = 'path/to/gifFolder/'
img_folder_path = 'path/to/imagefolder/'
images = []
for f in os.listdir(img_folder_path):
if f.endswith('jpg'):
images.append(f)
videowriter = imageio.get_writer(dir_path+'movie.gif', fps=5)
for filename in images[0:30]:
print(filename)
img = imageio.imread(img_folder_path+filename)
videowriter.append_data(img)
videowriter.close()
I want to extract frames from 3 videos into 3 different folder. Each folder has the frames of their corresponding video file. I am able to access my objective for only the 3rd video. How can I extract the frames for the first 2 videos as well
I have made the folders having names as per the video files till now. Developed the code for frame extraction but can extract only from the last video. Below is my code
import cv2
import glob
from glob import glob
import os
import shutil
def extractFrames(m,n):
if not os.path.exists:
os.makedirs(n)
vid_files=glob(m)
print(vid_files)
for v_f in range(len(vid_files)):
v1=os.path.basename(vid_files[v_f])
print(v1)
vid_name = os.path.splitext(v1)[0]
print(vid_name)
output = n +'\\video_' + vid_name
os.makedirs(output)
print(output)
vidcap = cv2.VideoCapture(vid_files[v_f])
print(vidcap)
success,image = vidcap.read()
seconds = 2
fps = vidcap.get(cv2.CAP_PROP_FPS) # Gets the frames per second
multiplier = fps * seconds
count=0
while success:
img_name = vid_name + '_f' + str(count) + ".jpg"
image_path = output + "/" + img_name
frameId = int(round(vidcap.get(1)))
success,image = vidcap.read()
if frameId % multiplier == 0:
cv2.imwrite(filename = image_path, img = image)
count+=1
vidcap.release()
cv2.destroyAllWindows()
print('finished processing video {0} with frames {1}'.format(vid_files[v_f], count))
return output
x=("C:\\Python36\\videos\\*.mp4")
y=("C:\\Python36\\videos\\videos_new")
z=extractFrames(x,y)
If there are 3 videos namely video1,video2,video3. I want to extract the corresponding frames into their specific folders i.e video1 folder,video2 folder, video3 folder. Currently I am able to extract the frames for only the 3rd video into folder video3. How can I do it for video1 and video2 as well
Your indentation on the part from vidcap = ... down is off. Therefor only the last file in the for-loop is used.
import cv2
import glob
from glob import glob
import os
import shutil
def extractFrames(m,n):
if not os.path.exists:
os.makedirs(n)
vid_files=glob(m)
print(vid_files)
for v_f in range(len(vid_files)):
v1=os.path.basename(vid_files[v_f])
print(v1)
vid_name = os.path.splitext(v1)[0]
print(vid_name)
output = n +'\\video_' + vid_name
os.makedirs(output)
print(output)
vidcap = cv2.VideoCapture(vid_files[v_f])
print(vidcap)
success,image = vidcap.read()
seconds = 2
fps = vidcap.get(cv2.CAP_PROP_FPS) # Gets the frames per second
multiplier = fps * seconds
count=0
while success:
img_name = vid_name + '_f' + str(count) + ".jpg"
image_path = output + "/" + img_name
frameId = int(round(vidcap.get(1)))
success,image = vidcap.read()
if frameId % multiplier == 0:
cv2.imwrite(filename = image_path, img = image)
count+=1
vidcap.release()
cv2.destroyAllWindows()
print('finished processing video {0} with frames {1}'.format(vid_files[v_f], count))
return output # indent this less
x=("C:\\Python36\\videos\\*.mp4")
y=("C:\\Python36\\videos\\videos_new")
z=extractFrames(x,y)
I'm trying to read Videos, resize them and write them with a different codec, using OpenCV for Python3. The original frame rate should stay the same.
This works fine if I'm using MJPG as codec, but for other codecs the frame rate of the output is set to 600 fps. (I tried XVID, DIVX, WMV1, WMV2)
Is it possible to write Videos with those codecs with the original frame rate?
import os
import numpy as np
import cv2
codec = 'XVID'
new_size = (256, 256)
for root, dirs, files in os.walk("UCF-101"):
new_root = root.replace('UCF-101', 'UCF-101_resized_' + codec)
if not os.path.exists(new_root):
os.makedirs(new_root)
for file in files:
cap = cv2.VideoCapture(root + '/' + file)
fps = cap.get(cv2.CAP_PROP_FPS)
fourcc = cv2.VideoWriter_fourcc(*codec)
out = cv2.VideoWriter(new_root + '/' + file, fourcc, fps, new_size, isColor=True)
while(cap.isOpened()):
ret, frame = cap.read()
if ret == True:
frame = cv2.resize(src=frame, dst=frame, dsize=new_size)
out.write(frame)
else:
break
cap.release()
out.release()
print('wrote ' + new_root + '/' + file)
Try changing your file extension to output file name with .mp4, not avi
codec = 'x264'
Replace if ret == True: with if frame is not None:
I have such a loop to write video files from images:
for a in range(len(events)):
c_videos = []
first = events[a][0]
last = events[a][1]
c_videos = video_ids[numpy.where(numpy.logical_and(timestamps >= first, timestamps <= last))]
video_name = "/export/students/sait/9-may-video-dataset/video-" + str(events[a][2]) + ".avi"
video = cv2.VideoWriter(video_name,-1,1,(width,height))
for b in range(len(c_videos)):
img_file = "/export/students/sait/9-may-results/rgb-" + str(c_videos[b]) + ".ppm"
img = cv2.imread(img_file)
video.write(img)
cv2.destroyAllWindows()
video.release()
But I cannot become successful in creating videos. I don't see any created video file under the destination directory.
How can I fix this problem?