#What is ffmpeg how to
#What is ffmpeg movie

Inputs start from 0, so the first input ( example.mp4) is 0, and the second input ( LM_logo.png) is 1. In the filter_complex string, you can specify the input on which you want to operate with a number and the type of stream. How do you specify which one you want to scale? Well, that is the purpose of. In the example above, you tell scale to make the stream 150 pixels wide and to scale its height proportionally.Д«ut, what video stream are you talking about? The FFmpeg instruction above has two inputs: example.mp4 and LM_logo.mp4. If you want to make sure FFmpeg keeps the proportion correct, pass one of the parameters and then -1 as the other. First, notice the new scale filter, which changes the scale of a video stream by taking a new width and height separated by a colon. You can solve this by adding a new filter and chaining it to overlay: ffmpeg -i example.mp4 -i LM_logo.png -filter_complex ' scale=150:-1, overlay=W-w-10:H-h-10' -codec:a copy example_marked.mp4 The same goes for H-h-10, but in the vertical axis (see Figure 3).ДЇigure 3: You can place your logo by passing the x and y position as parameters to overlay. This means that W-w-10 will place the top overlay layer 10 pixels from the left-most edge of the bottom video layer. In this case, you pass to overlay the horizontal position and then the vertical position, separated by a colon ( :), of the top layer (containing the logo).ДЇFmpeg also provides a convenient way to pass the width and height of each layer to the overlay filter: W is the width of the first input (the bottom layer), and w is the width of the second input (the top layer). When you pass a parameter to a filter, you do so using the = syntax. Instead of the upper-left corner, it would be better in the lower right, like most channel logos on TV.ДЇortunately, most filters can take parameters, and overlay can too: ffmpeg -i example.mp4 -i LM_logo.png -filter_complex 'overlay=W-w-10:H-h-10' -codec:a copy example_marked.mp4 Within -filter_complex, you can string filters together, and they will be applied one after the other to one stream, the other, or both.ДЄlthough this is a step in the right direction, the result isn't very subtle. Of interest is the -filter_complex construct, which sits between the inputs and the output.

#What is ffmpeg movie

I'll assume the video you'll be using is a 720p (1280x720) MP4 video called example.mp4.ДЇigure 2: The movie marked with a gigantic watermark. It is a PNG with a transparent background.

#What is ffmpeg how to

To illustrate how filters work, I'll show you how to use a logo to watermark a video. You can apply filters to whole audio or video streams or only to certain parts, use them to merge several streams into one in interesting ways, and do much more. One of the most powerful FFmpeg features is its effects pipeline, or 'filters,' as they are known by FFmpeg users. It can be used to change the frame rate, switch in and out audio and subtitle tracks, and even cut up and re-arrange sequences within a movie. However, FFmpeg can do much more than that. The instruction ffmpeg -i input.mp4 output.webmД¬onverts an MP4 video file into a WebM video file. In its simplest form, that is what it does. You've probably used FFmpeg before for converting video and audio files between formats. You can do dozens, nay, scores of things with your videos, without ever having to open a graphical video-editing application. The same goes, believe or not, for video editing. That would work if you only had one file, but what would you do if you had a filesystem with hundreds of files scattered all over the place? You would never consider seriously trawling through every directory and subdirectory, opening each file in turn, and clicking through the search-and-replace process, would you? A Bash script using find and sed would be the way to go. Say you have to change every instance of 'Bill' in a 100-page text file to 'Gary.' Sure, you could use the search-and-replace feature in your text editor. How much better? Well, it makes stuff easier to batch process, for starters. Below is the video associated with this article.