This is a video compression technique that divides frames into macroblocks and then looks for redundancies between blocks. This realization gave birth to the idea of interframe prediction. So if that plant in the example is not going to change, why not just keep using the same elements in some of the subsequent frames to reduce space?
As a result, that’s a lot of wasted bandwidth used just to convey that something hasn’t changed.Ĭonsequently, when looking for effective ways to compress video content, frame management became one of the cornerstone principles. For example, if someone is talking while standing next to a motionless plant it’s unlikely that information related to that plant will change. On an average video, if someone were to take 90 consecutive frames and spread them out they will see a lot elements that are pretty much identical. So content created that uses a FPS of 30 means there are 30 “still images” that will play for every second of video. Usually denoted as FPS (frames per second), each frame is a still image that when played in sequence creates a moving picture.
#Ffmpeg images to video start image and skip numbers series#
Starting at a high level, most probably realize that video content is made up of a series of frames. To understand this relation, one first needs to understand video frames. A keyframe is an important element, but really only part of a longer process that helps to reduce the bandwidth required for video. As someone matures as a broadcaster, it pays to understand elements in greater detail to learn why a process is done and also optimal settings.įor example, a keyframe is something a few broadcasters have seen mentioned before, or saw the setting in an encoder like Wirecast, without quite realizing what it is and how beneficial this process is for streaming. There are a lot of terms and aspects of streaming technology that can be taken for granted. Should someone use an “auto” keyframe setting?.What’s the best setting for a keyframe Interval?.Relationship between keyframes and bitrates.Choosing a keyframe interval at the encoder Level.What are b-frames and how do they differ from p-frames?.This article describes this process in detail, while also giving best practices and ideal encoder settings that you can apply for use with your live streaming platform. In particular, it overlooks a fascinating process called interframe, which involves keyframes and delta frames to intelligently compress content in a manner that is intended to go unnoticed.
This sells short, though, the complexity that actually goes into compressing video content. The default mental image of video compression involves unwanted video artifacts, like pixelation and blockiness in the image.
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