What is the file format of mkv?

mkv is the file extension of Matroska. It is an open standard free container and file format. It is a multimedia packaging format that can accommodate an unlimited number of videos, audios, photos or videos in one document. Subtitle track; mkv is not a compression format, but a multimedia container file defined by Matroska. The biggest feature of Matroska is that it can accommodate multiple different types of encoded video, audio and subtitle streams, even including streaming media such as RealMedia and QuickTime.

#The operating environment of this article: Windows 7 system, Dell G3 computer.

.MKV is the file extension of Matroska. Matroska multimedia container is an open standard free container and file format. It is a multimedia packaging format that can accommodate an unlimited number of video, audio, photo or subtitle tracks in a document. It is not a compression format, but a multimedia container file defined by Matroska.

mkv is different from video encoding formats such as DivX and XviD, and also different from audio encoding formats such as MP3 and Ogg. MKV is a "combination" and "encapsulation" format that provides shells for these audio and video. Simply put, it is a container format. The more common DAT (a coding format for VCD) AVl, VOB, MPEG, and RM formats actually also belong to this type. However, they are either outdated in structure or not open enough, which prompted the emergence of MKV, a new multimedia packaging format.

MKV Features

The biggest feature of Matroska is that it can accommodate multiple different types of encoded video, audio and subtitle streams, even including streaming media such as RealMedia and QuickTime , can be said to be a major subversion of the traditional media packaging format! It has now become almost a universal media container. The types of video, audio, and subtitles it can currently encapsulate include:

• AVI files, including DivX, XviD, 3ivX, VP6 Video encoding, and PCM, MP3, AC3 and other audio encoding AVI

• ##RealMedia files, including RealVideo and RealAudio

##QuickTime MOV and MP4 Video
Windows Media files, including ASF, WMV format
MPEG files, including M1V, M2V of MPEG-1/2
Ogg/OGM files, including Ogg Vorbis, OGM, FLAC files
Matroska Media files, including MKV, MKA, MKS files
WAV, AC3, DTS, MP2, MP3, AAC/MP4 audio
SRT, USF and SSA/ASS text subtitles
SubVob graphic subtitles, suffixed by IDX, SUB
BMP graphic subtitles, subtitles composed of a set of BMP pictures and time codes.
In addition, Matroska files can also include information such as chapters, tags (Tag), and even attachments! It should be pointed out that Matroska so-called encapsulates AVI, RM, MOV and other media, but it does not simply merge them into Matroska unchanged, but reorganizes their audio and video streams.

Matroska adds EDC error detection code that AVI does not have, which means that even MKV files that have not been downloaded can be played back smoothly, which is completely unimaginable for AVI. Although Matroska has added error detection code, due to the new more efficient organizational structure, the movie encapsulated in MKV is still about 1% smaller than the AVI source file. This means that even if multiple subtitles are added, MKV The file size cannot be larger than the AVI file.

Matroska supports variable frame rate (VFR, Variable Frame Rate) video encoding. The frame rate of this VFR video is not fixed. It can use a larger frame rate in dynamic pictures, and Using a smaller frame rate in static images can effectively reduce the size of video files and improve the quality of dynamic images. Its effect is more obvious than the currently widely used VBR (variable bit rate).

Look at the currently popular multimedia container types, such as AVI, which can accommodate multiple types of video encoding and audio encoding, such as VP6, DivX, XviD and other video encodings and PCM, MP3, AC3 and other audio encodings ; VOB is another media container with more distinctive features. It can accommodate MPEG-2 video streams, multiple AC3, DTS, THX, PCM audio streams, and multiple graphic subtitle streams in different languages.

The goal of MKV

Build a modern, flexible, extensible, multi-platform Internet server to quickly find files; develop a set of Matroska files for creation and editing Tools and released under the GNU Lesser General Public License; Develop an online library that allows developers to apply to Matroska to add their self-developed application software to the Matroska audio format and release it under the GNU Lesser General Public License; and hardware Works with manufacturers to embed their audio formats into multimedia devices; supports Matroska operation on a variety of operating systems (including Windows, DirectShow, Linux, Haiku and the multimedia processing framework GStreamer).

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