However, we would like to put music in this recording. Let’s imagine a situation where we have a video file and that in this file we have recorded audio. We can expect the final file to be one large file, where the videos will play one after the other. So we give our input, but instead of one file, we can have multiple files. final documents = await getApplicationDocumentsDirectory() įinal input = File(‘$” ‘ Then we can replace the input and output with new paths using string interpolation. The File object holds a reference to the file’s path, not the file itself. The output is a File object that doesn’t exist yet. The input file already exists in the user’s local storage. This method gives us access to the documents directory on a given device. To do this, we need to use the getApplicationDocumentsDirectory method from the path_provider package. Neither FFmpeg nor Flutter knows what the input and output are – we have to specify specific paths from the file systems on our phones. However, in a mobile app environment, we have to point to the exact location of the input and output files. We can test our solutions on the desktop and then implement them in the mobile application. It allows us to transfer what we wrote in the terminal to the parameter that the execute method takes in the form of a string. This object provides us with an execute method. The first thing we do is to create an object, which we create from the FluterFFmpeg class. final ffmpeg = FlutterFFmpeg() įfmpeg.execute(‘-i input.mp4 -af “volume=0.5” output.mp4’) Let’s assume that we have already installed FFmpeg to the Flutter project (to do this you need to add a dependency to the pubspec file, then some changes are required in adle and Xcode – all of this is described in the documentation). We can expect that the output.mp4 file (our result) will have 50% of its initial volume. Next, we specify the af parameter, which is the audio filter, and pass it a value that we want volume equal to 0.5. Then we give the parameter i, which is simply an abbreviation for input, in this case, a file called input.mp4. $ ffmpeg -i input.mp4 -af "volume=0.5" output.mp4Īfter installing FFmpeg into our terminal, first of all, we need to call the program’s name so that the terminal knows which program we are using. What is FFmpeg?įFmpeg is mainly a desktop application that we can use in the terminal providing a complete solution for creating audio and video. Luckily for us, we can also use a Flutter wrapper and avoid either Kotlin or Swift. It’s available for both desktop and mobile platforms. How does this transfer to the Flutter world? The solution that can perform the rendering process for us is, for example, FFmpeg-Kit for Flutter. It’s very important to note that such an application doesn’t create a media file, but collects a set of instructions, which later is used only in the rendering process to make a new encoded video or audio file. We have a video track, a preview, and files on which we work. Most often when we talk about video editing, we associate it with a video editor program. FFMPEG MAP 2ND SOUNDTRACK TO OUTPUT FILE ANDROIDThe following solutions will work on Android and iOS without using Kotlin or Swift. FFMPEG MAP 2ND SOUNDTRACK TO OUTPUT FILE HOW TOI will show you how to work with FFmpeg in Flutter as well as other video processing tools you may use. This guide focuses on the first challenge. You also need to make sure that it can play right away. This includes buffering and other kinds of video transmission so that our user doesn’t lose too many MB of his packet, and can play the video comfortably. Our user somehow wants to see what we want to show, and will be playing the audio or audio from the speaker. Sometimes we need to trim the video or apply some effects, change the audio volume, and other such operations. I would single out three challenges that video and audio bring when we work on such features: And when it comes to mobile devices, this is our backyard as Flutter Developers. We’ve been using this medium forever – once in analog form, and more recently in digital form ( TikTok, Reels), that is, on smartphones and tablets. Starting from the beginning, audio and video have been with us for a long time.
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