8/28/2023 0 Comments Flutter video compress![]() Let’s make a list of things we’d like our function to be able to do: All the work will be done in a background thread, therefore our app’s UI will remain responsive enough to do other work, such as showing loading animations. Once we fully implement the code, what we will get is a single free function such that, when called, will compress a single video file with a given configuration and notify us for success or error with callbacks. The resulting code will work on iOS 9 and greater. Native AVFoundation Framework includes all the tools we need. In this tutorial, we are going to use Swift 4 with no external dependencies. In most mobile phones, if you are not willing to include external libraries to support other standards, your best option tends to be H264. The codec you prefer is not a quantitative decision, but a qualitative one. Some codecs work well for high bitrates but suck at lower values and Some work really well if the video isn’t shaky. If bitrate is the king, why are there so many codecs/algorithms/standards? Often, the only valid option is to try as many different bitrates as you can and compare the results to find the best compromise. A video of twice the width and height (in pixels) will require at least four times the bitrate not to sacrifice some color detail.Īs the developer, understanding how the video is captured provides more flexibility when deciding to sacrifice quality to save some storage and bandwidth. A video with twice the frame rate of another video that is otherwise the same will require twice the bitrate (ignoring the audio) to visually appear the same. ![]() The more information there is, the better the visuals and the audio are. If you decide to leave the initial video as it is, it is guaranteed to consume more storage for the same duration with each release of a new iPhone/iPad.īitrate represents the amount of information a video file is allowed to store. Then the user of the initial compression (you) is allowed to re-compress as needed. Initially, when the video is captured by the camera, the software inside the camera defaults to a higher, general purpose bitrate in order to maximize quality. The bitrate is chosen by the person who compresses the video every time a video is compressed. 1000 bps is equal to 1 kilobits per seconds (kbps), 1000 kbps is equal to 1 megabits per seconds (mbps), you get the point. The calculation does not include the space required by the metadata and file headers but most of the time, their contributions are negligible.īitrate is measured using bits per second, or bps. The final formula to calculate how many MBs to expect after the compression is simply:ĭuration (seconds) x (Video Bitrate + Audio Bitrate) In other words: two video files compressed with the same bitrates (i.e one is HD and the other is not) will ALWAYS consume roughly the same amount of storage space. If you know the bitrate of the video and audio, as well as the duration of the file in seconds, you can accurately calculate the final file size even if you have no idea what the video resolution or playback frame rate is. Both of these parts contribute to the final video size and the only determining factor of the individual file size is a thing called “the bitrate.”īitrate is the amount of bits (8 bits = 1 byte) required per one second of a video/audio file. One file is a silent slideshow of pictures and the other is the audio to be played along with the slideshow. What sets the size of a video file?Ī video file is actually two files attached to each other, assuming that the video is not 3D and that the audio is not multi-language. ![]() Below you will find a line by line explanation of how to do that. As an obsessive optimization guru, you know that there must be a way to utilize all of the horsepower in our phones. Unfortunately, cloud service providers’ price tag for storage and bandwidth do not reflect this increase. The state of technology today means that most iPhones are more powerful than some desktop gaming computers and are also bundled with industrial-grade cameras, so the disk space a single video consumes increases tremendously every year. The more users your app has, the more bandwidth your server will require, not to mention the storage space. Or maybe your app overlays some special effects on people’s faces. Maybe your app is a video sharing platform where people showcase their talent. Skip to the end of the article if you’re just looking for code.Ĭhances are there will be a time when you’ll need to capture a video within your app, compress it to a respectable size, and then send it to your server to fulfill some feature of your app. TLDR Skip to the “How do I compress an H264 video?” section if you already know what “bitrate” and “codec” mean. This post is brought to you by TestFairy, a mobile testing platform that helps companies streamline their mobile development process and fix bugs faster.
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