What is the best format to save the video?
To reduce the “weight” of the video, various video formats are created using different compression algorithms. Thanks to this technology, a video file can be compressed hundreds of times without loss of image and sound quality.
Today, in addition to the widespread DVD video format, there are many types of video formats that differ in video encoding method and file size.
DVD video
DVD video playback requires a DVD drive and an MPEG-2 decoder (that is, a consumer DVD player with a hardware decoder or a computer DVD drive and a software player with a decoder installed). DVD movies are compressed using the MPEG-2 algorithm for video and various formats (often multi-channel) for audio. The compressed video bit rate (bit rate) ranges from 2000 to 9800 Kbps, often variable (VBR). The standard video frame size of PAL standard is 720×576 pixels, NTSC standard is 720×480 pixels.
It can be viewed on a DVD player and computer, as well as smart devices.
MPEG-2
In reality, MPEG-2 is not just a digital format, but a group of standards used to encode and compress video and audio data. It is most often used to process video intended for DVD recording, as well as to organize the transmission of a multimedia transmission through digital television channels. MPEG-2 encoded videos typically play at around 25-30 frames per second. Compression of the audio backing frames can be performed on multiple channels.
It can be viewed on the computer and on smart devices.
MPEG-4
The MPEG-4 format was created in 1998. The purpose of its creation was the prospect of greater compression of digital audio and video, so that an MPEG-2 movie fits on a DVD disc, but the same movie in compression format MPEG-4 fits freely on a CD, the capacity of which is 6 times less.
The MPEG-4 format, like MPEG-2, stores only the frames in which the image in the frame has changed greatly. But this format does not store intermediate frames, such as MPEG-2. Instead, the MPEG-4 file stores data about changes (also about expected changes) in the image between two control frames (key). Information received about changes can be compressed in the same way that the file is compressed by programs designed to archive data.
This format has a large number of varieties and is used in various video playback devices.
MPEG-4 is an international standard approved by ISO, the international standards organization. It is usually used to compress digital audio and video, for streaming (video streaming), movie recording, in video telephony and streaming, in a word, where digital video and audio compression is actively used.
It can be viewed on the computer and on smart devices.
Windows Media
This format (Windows Media) was developed by the well-known company Microsoft and is intended to store compressed audio and video. This compression format is capable of providing high quality video and sound, which in some cases exceeds the quality of DivX and MPEG-2, but is basically identical, and this is with a less complex compression algorithm.
Another advantage of this codec is that all the necessary software (codecs, decoders) is already installed in Windows operating systems, making it easy for users to find and install software and easily view it in the built-in Windows player: Windows Media Player or devices. smart.
Containers
Many people confuse concepts like “container” and “format” of a file. Often in my environment, phrases like “AVI file format” fly by. This expression is not entirely correct, although AVI is a long-standing file format. But files with the AVI extension can contain uncompressed video of various formats: MPEG-4, DV, DivX, Xvid, and of course MPEG-1 and MPEG-2. Also, the AVI format can only contain audio. This tells us that AVI files are containers for content in various formats.
A container is a file that has some kind of extension that is used to store analog information converted to digital format. Some containers store service information. For example, a video file can include captions that are inherently not part of the video image, but only plain text. Many players have a feature to enable and disable the display of titles in the frame. Summarizing, we can conclude that a container is a file of a certain
