MP3: complete analysis of the audio format
WMA: WMA is the file format encoded by Windows Media Audio, developed by Microsoft.
WMA is not aimed at the independent market, but at the network! The competitor is the well-known Real Networks in the online media market. Microsoft claims that at a bit rate of just 64 kbps, WMA can achieve sound quality close to CD. Unlike the previous encoding, WMA supports the anti-copy function. Supports adding protection via Windows Media Rights Manager, which can limit playback time, number of playback times, and even playback machine, etc. WMA supports streaming technology, that is, play while reading, so WMA can easily realize online streaming. Because it is a Microsoft masterpiece, Microsoft has added support for WMA in Windows. WMA has excellent technical characteristics. With vigorous promotion, this format has been accepted by more and more people.
WAV: This is an old audio file format developed by Microsoft. WAV is a file format that complies with the PIFF Resource Interchange File Format specification. All WAVs have a file header, the encoding parameters of this file header audio stream. WAV does not have a strict regulation on the encoding of audio streams. In addition to PCM, almost all encodings that support the ACM specification can encode WAV audio streams. Many friends do not have this concept. Let’s take AVI as an example, because AVI and WAV are very similar in file structure, but AVI has one more video stream. There are many types of AVIs we have come into contact with, so we often need to install some decoders to watch some AVIs. DivX, which we have come into contact with a lot, is a type of video encoding. AVI can use DivX encoding to compress video streams, and of course we can also use other code compression. Similarly, WAV can also use a variety of audio codecs to compress its audio stream, but we commonly use WAV whose audio stream is processed by PCM encoding, but this does not mean that WAV can only use PCM codec, it is also you can use MP3 codec. in WAV Just like AVI, as long as the corresponding Decode is installed, you can enjoy these WAVs. On the Windows platform, WAV based on PCM encoding is the best supported audio format. All audio software can support it perfectly. Because it can meet higher sound quality requirements, WAV is also the preferred format for music creation and editing. Suitable for storing musical material. Therefore, WAV based on PCM encoding is used as an intermediate format and is often used in the conversion of other encodings, such as MP3 to WMA.
Ogg Vorbis: The so-called MP3 killer! What is the origin of Ogg Vorbis? OGG is the project name of a large multimedia development program, which will involve coding development in aspects such as video and audio. The whole purpose of the OGG project plan is to provide a completely free media encoding solution for anyone! OGG’s belief is: OPEN! FREE! The word Vorbis is the name of a “playboy” character in the fantasy novel “Small Gods” by Terry Platjat. This term became the official name for audio encoding in the OGG project. At present, Vorbis has been successfully developed and an encoder has been developed. Ogg Vorbis is a high quality audio coding scheme. Official data shows that Ogg Vorbis can achieve better sound quality than MP3 at relatively low data rates. This Ogg Vorbis encoding is also much more advanced than MP3, which was successfully developed in the 1990s. It can support multiple channels. What does this mean? This means that Ogg Vorbis can encode all channels with the support of SACD, DTSCD, DVD AUDIO ripping software (currently there is no such software), instead of MP3 it can only encode 2 channels. The rise of multi-channel music has brought revolutionary changes in music appreciation, especially when appreciating the symphony, it will bring more sense of presence. This revolutionary change cannot be adapted to MP3. Like MP3, Ogg Vorbis is a flexible and open audio codec that allows for significant sound quality adjustments and further algorithm improvements once the codec has been fixed. Therefore, its sound quality will be better and better. Just like MP3.
