72 lines
2.6 KiB
Python
72 lines
2.6 KiB
Python
#!/usr/bin/env python
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import sys
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if sys.version_info[0] >= 3:
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import PySimpleGUI as sg
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else:
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import PySimpleGUI27 as sg
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import cv2 as cv
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from PIL import Image
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import io
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from sys import exit as exit
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"""
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Demo program to open and play a file using OpenCV
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It's main purpose is to show you:
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1. How to get a frame at a time from a video file using OpenCV
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2. How to display an image in a PySimpleGUI Window
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For added fun, you can reposition the video using the slider.
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"""
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def main():
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# ---===--- Get the filename --- #
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filename = sg.PopupGetFile('Filename to play')
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if filename is None:
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exit(69)
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vidFile = cv.VideoCapture(filename)
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# ---===--- Get some Stats --- #
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num_frames = vidFile.get(cv.CAP_PROP_FRAME_COUNT)
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fps = vidFile.get(cv.CAP_PROP_FPS)
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sg.ChangeLookAndFeel('Black')
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# ---===--- define the window layout --- #
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layout = [[sg.Text('OpenCV Demo', size=(15, 1), font='Helvetica 20')],
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[sg.Image(filename='', key='_image_')],
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[sg.Slider(range=(0, num_frames), size=(60, 10), orientation='h', key='_slider_')],
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[sg.Button('Exit', size=(7, 1), pad=((600, 0), 3), font='Helvetica 14')]]
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# create the window and show it without the plot
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window = sg.Window('Demo Application - OpenCV Integration', no_titlebar=False, location=(0,0)).Layout(layout)
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image_elem = window.Element('_image_') # locate the elements we'll be updating. Does the search only 1 time
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slider_elem = window.Element('_slider_')
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# ---===--- LOOP through video file by frame --- #
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cur_frame = 0
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while vidFile.isOpened():
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event, values = window.Read(timeout=0)
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if event in ('Exit', None):
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exit(69)
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ret, frame = vidFile.read()
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if not ret: # if out of data stop looping
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break
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if int(values['_slider_']) != cur_frame-1: # if someone moved the slider manually, the jump to that frame
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cur_frame = int(values['_slider_'])
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vidFile.set(cv.CAP_PROP_POS_FRAMES, cur_frame)
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slider_elem.Update(cur_frame)
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cur_frame += 1
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imgbytes = cv.imencode('.png', frame)[1].tobytes() # ditto
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image_elem.Update(data=imgbytes)
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"""
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# This was another way updates were being done, but seems slower than the above
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img = Image.fromarray(frame) # create PIL image from frame
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bio = io.BytesIO() # a binary memory resident stream
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img.save(bio, format= 'PNG') # save image as png to it
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imgbytes = bio.getvalue() # this can be used by OpenCV hopefully
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image_elem.Update(data=imgbytes)
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"""
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main() |