The MKV file holds an unlimited number of video, audio, picture and subtitle tracks within the file. It is a convenient video file where you can fit in the highest amount of data possible. It is a RAW format that you can easily flip and turn all of the separate data tracks.
File saved into the MKV format more often than not save each track (subtitle, picture, audio and video) into a different dataline. This is similar to other container formats such as AVI or MP4 although generally when packaging an MKV file people rarely bundle all the tracks within the file. Most media players do not natively support MKV files, you would have to use a special media playing software to access its content normally such as VLC.
The GIF file format is a type of bitmap image and has become popular due to the growth of the internet. This file format supports up to 8 bits per pixel therefore giving an image the ability to contain 256 distinct colours chosen from the 24-bit RGB colour space. It also supports animations and whenever you see a logo or other sharp edged line art then you are probably dealing with the GIF format. It uses the lossless data compression technique which reduces the file size without any impact on the quality.
The GIF file format was invented by Compuserve for their online service, but they made the specifications publicly available. GIFs are able to hold multiple bitmaps of up to 256 colors each, using LZW (Lempel Zev Welch - a simple form of file compression that removes inefficiencies in the data storage without losing data or distorting the image) compressed raster data to minimize file sizes. The idea is to lessen the amount of colours in a GIF image to the minimum number necessary and to therefore remove stray colors that are not required to represent the image. A GIF graphic is unable to have more than 256 colors but it can have fewer colors, down to the minimum of two (black and white). Images with fewer colors will compress more efficiently under LZW compression.
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