5. RealMedia Series
The series of coding technologies developed by RealNetworks are also mainly used for network transmission and perform well at the bottom bit rate.
(1) RealVideo G2
The quality of the early RealVideo encoding was poor, but it was very advanced on the Internet at that time. After all, not many people were able to watch videos on the Internet at that time.
(2) RealVideo 8
The video format introduced with RealPlayer 8 is now one of the mainstream network video encoding. The encoding speed is slow, and the quality is only average.
(3) RealVideo 9
The new generation of encoding developed by RealNetworks has improved a lot in quality, especially at the bottom bit rate, and the encoding speed is very fast, achieving a good unity of speed and quality.
(4) RealVideo 10
On the basis of RealVideo 9, some parameters have been added, such as EHQ, etc., to control the bit rate more accurately and be compatible with RealVideo 9.
(5) RealAudio Cook
Earlier audio coding, but it seems that the quality is still good, but the maximum bit rate is 96kbps. Applied to two generations of audio coding: RealAudio G2, RealAudio 8.
(6) RealAudio Cook Multichannel
The improved version of Cook adds 5.1 channel support and is applied to RealAudio 10 Multichannel.
(7) RealAudio Sipro
Using Sipro speech coding technology, mainly for speech coding, used in the earlier RealAudio 4.0 and RealAudio 5.0.
(8) RealAudio ATRAC3
The ATRAC3 codec developed by Sony was purchased by RealNetworks and applied to RealAudio 8 to make up for the lack of Cook's high bitrate.
(9) RealAudio AAC
AAC audio encoding, used in RealAudio 10.
(10) RealAudio aacPlus
aacPlus audio codec, used in RealAudio 10, but it is not distributed with RealProducer and needs to be purchased separately.
(11) RealAudio Lossless
Lossless audio coding.
6. QuickTime series
QuickTime is not an encoding, but a multimedia platform. There are many encodings on it. Only a few mainstream encoders are introduced here.
(1) Sorenson Video 2
The encoder developed by Sorenson Media is mainly used for QuickTime 4 video encoding, and the quality is poor.
(2) Sorenson Video 3
The encoder released by Sorenson Media with QuickTime 5 is of very good quality and has become the standard video encoding of QuickTime. Most movie trailers on the Internet use this encoding.
(3) Apple MPEG-4
The MPEG-4 encoder developed by Apple, released with QuickTime 6, is of poor quality.
(4) Apple H.264
The H.264 encoder developed by Apple, released with QuickTime 7, supports HDTV.
(5) QDesign Music 1
This version of the audio encoder developed by QDesign is no longer available in this version.
(6) QDesign Music 2
The second and final version of QDesign Music. In the face of these advanced audio coding, it has no vitality, and is mainly used in online movie trailers.
(7) Qualcomm PureVoice
The voice encoder developed by Qualcomm is of good quality.
(8) Apple MPEG-4 AAC
The AAC encoder developed by Apple itself is of very good quality. It is one of the best AAC encoders and is released with QuickTime 6.
(9) AMR Narrowband
AMR speech encoder, this version only supports AMR-NB.
(10) Apple Lossless
The lossless audio coding developed by Apple is mainly used in iTunes ripping CDs.
7. Ogg series
Ogg is an open source project initiated by the Xiph.org Foundation, including video and audio, server, transmission system, client, hardware support, etc. The most familiar one is the audio Ogg Vorbis, which is considered to be at 128kbps so far. The best encoder.
(1) Ogg Theora
Ogg's video coding, based on On2 VP3 development, is still in the testing stage.
(2) Ogg Vorbis
Ogg's audio encoding is of excellent quality, especially at low bit rates, which supports multi-channel. The highest bit rate can reach 500kbps, which is a strong competitor of AAC.
(3) Ogg Speex
Ogg's speech coding, specifically for low bit rate speech coding.
(4) Ogg FLAC
Ogg's lossless audio encoding.
8. On2 VPX series
On2 company has developed a series of excellent video coding, and now the most used video is probably Nullsoft Video's video, they use VP3, VP5, VP6 video coding.
(1) VP3
It has been released as an open source code and is now the Ogg Theora project. Of course, the quality of Theora is much better than VP3.
(2) VP4
The On2 company boasted the world's best video codec, and later proved that the quality is very average.
(3) VP5
It is still very mysterious to this day. On2 has not been released. He was only seen in Nullsoft Video.
(4) VP6
From the very beginning, On2 provided this encoder for everyone to download, and the quality was good. However, it seems to be closed recently, and there is only one decoder on the homepage.
(5) VP7
On2's latest encoder has a lot of progress on VP6.
(6) Flash Video
The multimedia format introduced by Macromedia is mainly used to compress video in Flash. The video uses Sorenson's Spark encoder, and the audio uses MP3, which is of poor quality. It is rumored that the next generation of Flash Video is going to use On2 VP6, which will greatly improve the video quality.
(7) MPG
The container used in MPEG encoding has the characteristics of a stream. It is divided into PS, TS, etc. PS is mainly used for DVD storage, and TS is mainly used for HDTV.
(8) VOB
The container format used by DVD supports multiple videos, multiple audio tracks, multiple subtitles, chapters, etc.
(9) MP4
The container used in MPEG-4 encoding is developed based on QuickTime MOV and has many advanced features.
(10) 3GP
The format adopted by 3GPP video is mainly used for streaming media transmission.
(11) ASF
The container used by Windows Media can be used for streaming and can contain scripts and so on.
(12) RM
The container used by RealMedia for streaming.
(13) MOV
The QuickTime container is probably the most powerful container today, and even supports virtual reality technology, Java, etc. Its variants MP4 and 3GP are not so powerful.
(14) MKV
MKV It can merge Windows Media Video, RealVideo, MPEG-4 and other video and audio into one file, and supports multiple audio tracks, chapter subtitles, etc.
(15) OGG
The container used in the Ogg project has streaming characteristics and supports multiple audio tracks, chapters, subtitles, etc.
(16) OGM
A variant of the Ogg container that can support DirectShow-based video and audio encoding, and features such as chapters.
(17) AVI
The most common audio and video container.
(18) NSV
Nullsoft Video container for streaming.
(19) WAV
A kind of audio container, WAV is often referred to as uncompressed PCM encoding. In fact, WAV can also include other ACM compression encodings such as MP3.
Audio and video coding is really a huge field. The introduction here doesn't even touch the skin, and only introduces a few mainstream series. It feels dizzy to look at it. The next generation of HD DVD and Blue Ray Disc disputes are not over yet, WMV9 and AVC are starting to excite again, and the complicated coding makes people less and less understand, do we really need so much?
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