Video Editing in Python Using MoviePy - Part I

[Music] [Music] [Music] hello and welcome to video editing in python using moviepie video series this is part one of this video series and in this particular part we are going to discuss what pie is what it can do how to install it and how to get started with it movie pie basically is a very very powerful package for video editing not just video you can you can actually work with audio you can work with text you can overlay text on the video you can change the video of one clip to another you can actually make your own tick tock uh just by picking a video from the video images from some other source and audio source audio clip from another source and just mixing them up um not only that you can crop videos you can you can just give special effects to the videos you can you can actually do frame by frame processing uh using movie pi although uh using frame by frame processing is not really recommended uh in movie pi there are some better packages for frame by frame processing like opencv and some simple cv and some other packages but moviepie basically give you a very powerful api for working with working with videos audios and text and making custom animations uh combining different clips together um and and making another clip and stuff like so so um yeah in this particular part we will be uh actually getting started with uh video editing uh basically we'll be uh loading videos we'll be playing videos in jupiter notebooks we will also be saving uh videos on hard disk uh we will be cropping videos we will be picking sub clips we will be actually changing um changing audio of a video with audio of another video um we will also be seeing how to display overlay text over a video or how how to actually make the text moving on on a video so everything basically is in this uh in this part uh in the next part however we will see in the next part of this video series we will be actually seeing how to combine different clips together uh and make one video that actually contains a lot of videos um and in the third and final clip of this video series we will be actually seeing how to make custom animations um using movie pie so let's dive in uh first of all um how to install it um just write pip install movie pie and that's it it will get installed um there are some dependencies that uh moviepie automatically installs for you um but one thing that um that is worth mentioning is image magic tool that you have to install uh separately so it's always good to install first the image magic and then install moviepie um then there are some config defaults file config defaults config underscore defaults dot pi file in movie pi in which you have to you have to set the path of image magic in my machine however i just installed image magic i reboot the system and everything works automatically but in certain cases you may have to work with config defaults maybe you also have to install pygame that also has some dependency with movie pie but most of the stuff is just done using this movie pie and image magic if you for example go to the owner's page silko it's the owner of this package uh there are these clear instructions so you can see the zulko github.io moviepie slash you can go to download and installation and it actually guides each and everything how to install it uh what kind of dependencies are there uh how to change this config underscore defaults if required uh for dependencies you have to use this image magic how to change the path of the image magic and stuff like so and also you may need the spy game for video and sound previews if you really want to see the previews um if you want to see the previews there is a function clip dot show if you want to use that you may need this buy game uh installed so yeah and and that's a good page by the way it uh it actually contains a lot of documentation a lot of example scripts and a lot of stuff um and it's uh to to learn movie pie in detail it's good to just go through this page first so yeah um uh let's let's basically start um coding in moviepie let me just set the zoom level to a better level uh let me uh yeah so first of all um we have to from we have to load most of the stuff is done by movie pie dot editor so movie pie dot um editor from there if you want to import certain modules you can import certain modules if you import if you want to import everything although it's not recommended because it makes things slow but um here is we have imported each and everything um from this movie pi now next what we do is uh we read a video clip from from the hard disk here i have some video clips downloaded from youtube so let's read 2 dot mp4 and see its properties so 2 or mp4 that's the path and here we go back so let's say clip equals video file clip that is there in moviepie dot editor video file clip there are there are basically three kinds of clips video clips uh audio clips and text clips so video file clip are that is for the raw string and here you actually read the clip so yeah the clip has been read there are several properties that we can see about this clip for example the size of this clip so width and height is clip dot size what is the size of this clip so let's print width and height and the size of this particular clip is the width is 480 and the height basically is 360. so that for this particular clip that's the width and height there are other for example other properties of this clip as well so for example clip dot duration what is that the duration of this clip in seconds is 283 seconds if we for example divide this by 60 we may get the minutes which is four minutes and roughly the rest is again the seconds so around four minutes four point some uh minutes so 4.72 minutes so if we multiply this point 72 with 60 we get exactly the number of minutes that are there further we can we can also see several things let's see for example clip dot fps frames per second this video has been recorded in how many frames per second a frame is an image in in videos normally in one second it actually saves a lot of images those images are called frames so this frames per second is a property for high resolution images these high resolution video images this fps number is really large which means for one second you are saving a lot of details a lot of frames so in this particular case for this particular video the frames per second property is really 30. um we can have a sub clips if we really want before before actually going towards the sub clip and stuff like so let's actually display this clip uh in in in the jupyter notebook so clip dot ipython display so clip dot ipython display and here you can set the width uh inside the notebook for example the width i'm setting the width like let's say 280 maybe maybe i can set the width maybe the original width or maybe for example 350 and it will automatically uh actually it will automatically take care of the aspect ratio and will convert the height accordingly so that will do that will actually embed the clip in i in this jupyter notebook so let's see how it goes uh it will take some time because it is rendering so yeah it will take some time it's a it's a long clip it will take some time to render it so yeah let's let's wait for it rendering and then we will be actually we will actually be able to uh see it's playing inside the inside the notebook so let's see let's wait for it it is rendering um yeah or maybe i can just pause the video and once the rendering is up then i then i get back to this video against to to save the time so let me let me get this thing finished and then we will see if oh it's an error what kind of error is this not the embedding large videos may take all the memory away so this video basically is oh this video is basically large and it exceeds the maximum duration so it cannot be embedded uh inside the uh inside the notebook so let let's just let's just get a sub clip of this video and and and show that so why not why not just pick the sub clip of that video so clip two is clip dot sub clip and um i actually get the sub clip with the ending time as as 0 0 30 that means um pick the sub clip of the image starting from the very beginning but the end time is 30 seconds this the first argument is for hours the second argument is it argument is for minutes and the third argument is for seconds so what i'm saying here is uh start from the very beginning and go till 30 seconds and crop and and just and just get the sub clip and copy that into clip two uh you can set the dstart property here tn property here separately and you can work with that as well so that's clip two now let's uh let's display this clip too maybe it is faster clip two is dot i python display this is faster maybe because uh the the duration of this clip is smaller width is let's say uh 280 maybe so let's see uh if it is a little bit quicker let's see so yeah so here it has actually rendered that inside this jupyter notebook and now you can see you might be uh hearing the the sound of the the sound of the video as well [Music] so these are the 30 seconds of the video [Music] and not only that i mean you have you have found the sub clip no if you really want this sub clip or the part of the video to be saved on the hard disk you can actually go and write clip to dot um right video file and there you have to give the path of the video file where you really want to save it so for example um let me give the path like this and here we go and here we say ok to clipped and it will start actually writing that onto the hard disk for you there are certain extensions there are certain extensions that are supported uh i'm right now i'm working with mp4 there are a couple of others as well so yeah it has done so let's go to hard disk and actually see this is too clipped so let's open up it in windows media player and here you're seeing the 30 minutes clip 30 seconds clip yeah yeah so that's the very beginning of uh this clip sub clip and stuff like so let's play uh with it a little bit more let's say for example clip three is clip two dot rotate uh with 180 degree so what it will do is it will rotate the clip uh with 180 degree and then if you really want to embed this if you really want to see this clip 3 dot ipython display oh the clip 3 is not created yet so this so clip 3 dot python display um and whatever the original length is so i will i will go with that so that will embed there remember all the operations here in this movie pi they uh actually are not performed on the whole video until the video is rendered for either display or embedding in the notebook or or if it is going to be written on uh on in the in the hard disk so at the very final time the video is rendered and at that particular time it takes some time so uh let's see basically if i have rotated the video by 180 degree it actually flipped the video upside down so let's see how it goes yeah so that has a larger size let me uh let me do a little bit yeah so if you now see the video is just upside down and there are a lot of effects that you can go through with um right now um i'm going to basically um add um add a text clip on the on on on this particular video clip so we will be having video clip two what i'm going to do is i'm going to uh overlay text on this video clip too um you can you can have several other functions for example clip 2 is clip 2 dot volume volume x and that if for example i set the value 0.7 that means reduce the volume of my clip um by by i mean just keep the 70 of it and reduce it by 30 percent and and you can give this number to be larger than one and the volume become increase amplified so and and there are so many other functions there are so many other functions you can just uh you can just check right now i'm going to basically um uh write a write a floating text on on this video and the resultant video will be saved or displayed in the notebook or can be saved in the hard disk either way so we already have clip two let's make a text clip so let me write text clip is text clip that is there in movie by dot editor um let's say the text clip contains the text as a i sciences i ai sciences um and for this text clip the font size is let's say let's say the font size is 150 and the color let's say the color is you can have different colors uh let's say the color right now is let's say we have red color so that's our text text clip uh next what we do is uh we set the set the position of this text clip so text clip is equal to text clip unlike other object-oriented packages where you write a dot and you call certain functions and the properties are changed inside um this moviepie actually returns a copy and you have to save the copy otherwise the changes are lost so that's why i actually i'm saving i'm doing i'm going to change the properties of text clip but the properties they will not be reflected inside this object but it returns an object that you have to save somewhere otherwise they will not be saved exactly here which is uh which is something something different than the ordinary uh object oriented programming where we actually change the properties inside the object so position so position and we can set several positions we can we can for example i can just set the position um 20 and 20 that means for screen size for the m for the clip size go to 2020 and just place that text uh what what other thing that i can do is i can change the position with time using a function let's say lambda t that t is the time t basically is the time and we are going to change this the position time by time so let's say 10 historic t then steric t so that means for every time unit go to this particular position and display the text further i have to set the duration of the clip duration let's say the duration duration of the text let's say the duration of the text is the duration of or or let's say duration of the let's say duration of clip 2. duration so that's um our text clip ready and positions are set what next is we need to overlay this text onto the video so let's make a final clip or video final video and here we will be using composite function composite class composite video clip class um we will see the composite video clip class in more detail in our next part of the same series right now i'm just using it clip 2 and then we have this text clip and we can set the start of this clip when should it start let's say it should start right after two seconds of the clip two video and then we can have effects like a fade in effect so let's say cross fade in how many seconds it should fade in it should appear it should take how many seconds to appear in the video let's say let's say three seconds and that's our video um yeah video is ready now once the video is ready now we can either embed it in ipad ipython notebook or we can save it so let's embed it in the notebook video dot ipython display and let's display it in with width let's say 280 let's say um yeah so let's see how it goes it will take a few seconds to render it so yeah almost done um not almost i mean but getting closer and closer and this uh text will appear in the floating form on this uh video so let's see that [Music] yeah so you can see this oh the font size is too big the font size is too big for for this video so let's go back and let's go back and reduce the font size the font size is let's say um let's say 20. let's go back let's re-render it because the font size was too big to appear on this video so let's see how it goes now with the new font size [Music] oh you can see this a sciences um yeah it is floating over the video you can have special effects for this you can have you can have certain characters to appear one by one and moves on it will stay as long as the the video continues because we set the duration as the duration of the video clip so yeah that's cool we have done a lot of stuff just in just in a very small amount of time and that's the power of this package i mean if you want to start video editing um you want to play with audio you want to play with text uh this is the this is one of the best packages to really start with um yeah uh i end this part here in the next part i will be actually going a little deeper and i will be telling you how to combine different uh video clips together to make a final video that has um that has a combination of several clips and we will be primarily using concave we will be primarily concatenating videos we will be actually arranging them in a matrix form or actually more precisely we will be using this uh composite video class uh composite video clip class um to to get special kind of effects um and in in the last part of this video series part three we will actually be making our custom animations so hope to see you in the next part [Music] [Music] [Music] you

Channel: AI Sciences

Views: 39,352

Keywords: programming, python, algorithms, projection, deeplearning, ai, ml, analysis, 3d, visuals, data science, interactive visualizations, numpy, NumPy, Plotly, graphs, charts, coding, opencv, multiple object tracking, singular value decomposition, singular, value, decomposition, eigen, eigen space, fundamentals of machine learning, fundamentals, tutorial, moviepy, ffmpeg, imagemagick, python tutorial, computer programming, learn programming, how to learn programming, data engineer, ken jee, data science project

Id: 2t0I0URiS40

Length: 24min 57sec (1497 seconds)

Published: Mon Aug 17 2020