codingdirectional: Create equalizer feature for video editing program

Today we will continue to work on the user interface of the previous video editing application. The equalizer options for this video application will be located in the second row of this application. We will create another frame to hold all those equalizer options. Each option will consist of a scale box which allows the user to select the value from each equalizer’s option. The default value for each option will be provided as well.

This is the revise UI for the program.

http://islandstropicalman.tumblr.com/post/182155440040/the-video-editing-application

When we just select the above options and then select a video to edit we will get the below outcome.

http://islandstropicalman.tumblr.com/post/182155502874/the-video-created-with-a-video-editing-application

Below is the revise python program for this video editing project.

from tkinter import *
from tkinter import filedialog
import os
import subprocess
import tkinter.ttk as tk

win = Tk() # Create instance
win.title("NeW Vid") # Add a title
win.resizable(0, 0) # Disable resizing the GUI
win.configure(background='white') # change background color

mainframe = Frame(win) # create a frame
mainframe.pack()

eqFrame = Frame(win) # create eq frame
eqFrame.pack(side = TOP, fill=X)

buttonFrame = Frame(win) # create a button frame
buttonFrame.pack(side = BOTTOM, fill=X)

# Create a label and scale box for eq
contrast_variable = DoubleVar()
contrast = Scale(eqFrame, from_=float(-2.00), to=float(2.00), orient=HORIZONTAL, label="CONTRAST", digits=3, resolution=0.01, variable=contrast_variable)
contrast.set(1)
contrast.pack(side = LEFT)
brightness_variable = DoubleVar()
brightness = Scale(eqFrame, from_=float(-1.00), to=float(1.00), orient=HORIZONTAL, label="BRIGHTNESS", digits=3, resolution=0.01, variable=brightness_variable)
brightness.pack(side = LEFT)
saturation_variable = DoubleVar()
saturation = Scale(eqFrame, from_=float(0.00), to=float(3.00), orient=HORIZONTAL, label="SATURATION", digits=3, resolution=0.01, variable=saturation_variable)
saturation.set(1)
saturation.pack(side = LEFT)
gamma_variable = DoubleVar()
gamma = Scale(eqFrame, from_=float(0.10), to=float(10.00), orient=HORIZONTAL, label="GAMMA", digits=4, resolution=0.01, variable=gamma_variable)
gamma.set(1)
gamma.pack(side = LEFT)

# Create a combo box
vid_size = StringVar() # create a string variable
preferSize = tk.Combobox(mainframe, textvariable=vid_size) 
preferSize['values'] = (1920, 1280, 854, 640) # video width in pixels
preferSize.grid(column=0, row=1) # the position of combo box
preferSize.current(0) # select item one 
preferSize.pack(side = LEFT, expand = TRUE)

removeAudioVal = IntVar()
removeAudio = tk.Checkbutton(mainframe, text="Remove Audio", variable=removeAudioVal)
removeAudio.pack(side = LEFT, padx=3)

newAudio = IntVar()
aNewAudio = tk.Checkbutton(mainframe, text="New Audio", variable=newAudio)
aNewAudio.pack(side = LEFT, padx=2)

# Open a video file
def openVideo():
        
        fullfilename = filedialog.askopenfilename(initialdir="/", title="Select a file", filetypes=[("Video file", "*.mp4; *.avi ")]) # select a video file from the hard drive
        audiofilename = ''
        if(newAudio.get() == 1):
                audiofilename = filedialog.askopenfilename(initialdir="/", title="Select a file", filetypes=[("Audio file", "*.wav; *.ogg ")]) # select a new audio file from the hard drive
                
        if(fullfilename != ''): 

                scale_vid = preferSize.get() # retrieve value from the comno box
                new_size = str(scale_vid)
                dir_path = os.path.dirname(os.path.realpath(fullfilename))
                os.chdir(dir_path)
                f = new_size  + '.mp4' # the new output file name/format
                f2 = f + '.mp4' # mp4 video

                noAudio = removeAudioVal.get() # get the checkbox state for audio 

                #subprocess.call(['ffmpeg', '-stream_loop', '2', '-i', fullfilename, '-vf', 'scale=' + new_size + ':-1', '-y', f]) # resize and loop the video with ffmpeg
                #subprocess.call(['ffmpeg', '-i', fullfilename, '-vf', 'scale=' + new_size + ':-1', '-y', '-r', '24', f]) # resize and speed up the video with ffmpeg
               
                #subprocess.call(['ffmpeg', '-i', f, '-ss', '00:02:30', '-y', f2]) # create animated gif starting from 2 minutes and 30 seconds to the end
                subprocess.call(['ffmpeg', '-i', fullfilename, '-vf', 'scale=' + new_size + ':-1', '-y', f]) # resize the video with ffmpeg

                if(noAudio == 1):
                        subprocess.call(['ffmpeg', '-i', f, '-c', 'copy', '-y', '-an', f2]) # remove audio from the original video
                
                if(audiofilename != '' and noAudio == 1 and newAudio.get() == 1):
                        subprocess.call(['ffmpeg', '-i', f2, '-i', audiofilename, '-shortest', '-c:v', 'copy', '-c:a', 'aac', '-b:a', '256k', '-y', f]) # add audio to the original video, trim either the audio or video depends on which one is longer

                subprocess.call(['ffmpeg', '-i', f, '-vf', 'eq=contrast=' + str(contrast_variable.get()) +':brightness='+ str(brightness_variable.get()) +':saturation=' + str(saturation_variable.get()) +':gamma='+ str(gamma_variable.get()), '-y', f2]) # adjust the saturation, gamma, contrast and brightness of video
                #subprocess.call(['ffmpeg', '-i', f, '-y', f2]) # converting the video with ffmpeg

                
action_vid = tk.Button(buttonFrame, text="Open Video", command=openVideo)
action_vid.pack(fill=X)

win.mainloop()

Tomorrow we will continue to edit this video editing software so stay tuned.

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