What Are the Different Types of Media Airtime?

Refers to playing or processing audio files in a computer, which is the process of digital and analog conversion of sound files. The maximum bandwidth of the audio format is 20KHZ, and the rate is between 40 ~ 50KHZ. Linear pulse coding is used to modulate the PCM. Each quantization step has the same length.

Media format

WMA is a file format encoded by Windows Media Audio, developed by Microsoft. WMA is not aimed at the stand-alone market, but the Internet! The competitor is the well-known Real Networks in the online media market. Microsoft claims that WMA can achieve CD-like sound quality at a bit rate of only 64kbps. Different from the previous encoding, WMA supports the anti-copy function. She supports adding protection through Windows Media Rights Manager, which can limit the playing time and the number of times of playing, even the playing machine and so on. WMA supports streaming technology, that is, reading while playing, so WMA can easily achieve online broadcasting. Because it is a masterpiece of Microsoft, Microsoft has added support for WMA in Windows. WMA has excellent technical characteristics. With vigorous promotion, this format is accepted by more and more people.

This is an ancient audio file format developed by Microsoft.

With the popularity of MP3 players, there are more and more brands and manufacturers of MP3 players, and competition is becoming more and more fierce. Coupled with the squeeze of MP3 mobile phones, many upstream MP3 players

AVI format: its English name is Audio Video Interleaved, which is an audio-video interleaved format. It was

MPEG format: its English name is Moving Picture Expert Group, that is,

MPEG-4: Established in 1998, MPEG-4 is specially designed to play high-quality video of streaming media. It can use very narrow bands to compress and transmit data through frame reconstruction technology for use. Get the best image quality with the least data. Currently

MOV format: a type developed by Apple Inc.

ASF format: Its English name is Advanced Streaming format. It is a video format introduced by Microsoft in order to compete with the current Real Player. Users can directly use the Windows Media Player that comes with Windows to play it. Since it uses

WMV format: Its English name is Windows Media Video, and it is also a file compression format introduced by Microsoft that uses independent encoding and can directly watch video programs online in real time. The main advantages of the WMV format include: local or network playback, scalable media types, component downloads, scalable media types, stream prioritization, multi-language support, environment independence, rich inter-stream relationships, and scalability, etc. .

RMVB format: This is a format from RM

D5: Abbreviation for DVD-5, that is, single-sided single-layer, maximum capacity of 4.7GB, one side of data, and the other side is generally printed with text or patterns.

D9: Abbreviation for DVD-9, that is, single-sided double-layer, maximum capacity of 8.5GB, data on one side, and general printed characters or patterns on the other side.

D10: short for DVD-10, double-sided single layer, with a maximum capacity of 9.7GB, and both sides are data planes.

D14: Short for DVD-14. That is double-sided and multi-layer, with a maximum capacity of 13GB. Data are recorded on two sides and three layers, the first side is double-layered, and the second side is single-layered.

D18: short for DVD-18, double-sided double-layer, maximum capacity 17GB, both sides are data side.

Lossy compression: abbreviated YSYS, which means to compress the decrypted original digital signal so that it can be loaded into a disk with a smaller capacity. The loss of the DVD disc produced by the lossy compression will reduce the image and sound quality.

AC3 sound quality. Now most of the DVD DVDs on the market use AC3 5.1-channel audio tracks. With 5.1 speakers, it can indeed create a better home theater effect. The DVDrip with AC3 sound quality is to directly copy the original audio track to the DVDrip during production, so there is no difference in sound effects between this DVDrip and DVD. But for the player to support AC3 audio tracks, you also need to install its audio filter.

mp3 vbr. The meaning of vb in vbr and rmvb is variable bit rate. The mp3 audio track is obtained by processing the AC3 audio track when making a DVDrip. The general size is 1/2 to 1/3 of AC3. This decoding generally can be played without additional installation.

Ogg. Ogg is a music compression format similar to mp3. Some producers believe that ogg performs better than mp3 because it uses ogg audio tracks, but from the current point of view, the mainstream is still mp3.

DTS audio tracks. DTS and AC3 are also 5.1-channel surround effects, which use different compression techniques. So when playing DVDrip with DTS source sound quality, it is necessary to install the corresponding decoder: DTS Source Decoder Filter. And pay attention to the installation of WinDVD and the sound will only be registered correctly (of course, it can also be achieved by registering its ax file, but it is still easier to install).

Taking "08.08.03.matrix.reloaded.ws.dvdrip.dlx-pr0nstars" as an example, the following information can be obtained from its file name:

08.08.03 This was published on August 8, 2003.

matrix.reloadedThis is the name of the movie.

ws stands for wide screen (1.85: 1).

dvdrip indicates the source of the video.

dlx represents the encoding used by the movie.

pr0nstars is a distribution organization.

Therefore, we can see that this is the dvdrip version of matrix.reloaded, released by the pr0nstars organization on August 8, 2003. You need to install the dlx decoder to watch, and it uses a 1.85: 1 image ( The normal film is 2.35: 1, which is why this version has black borders on top and bottom, and the actual image part is still 2.35: 1).

cam and ts: cam is usually stolen from a movie theater with a digital video camera. Sometimes a small tripod is used, but most of the time it is not possible, so the camera will shake. At the same time, because the camera seat is not always empty, sometimes the shooting is not horizontal. If post-production is good, it's hard to see unless there are subtitles at the bottom of the screen. Because the sound is recorded from the microphone that comes with the camera, it often records the audience's laughter and other sounds, especially comedies. Because of these factors, image and sound quality are often poor. But sometimes it's fortunate that the cinema is quite empty, so it will record a better sound. telesync (ts): The standard for telesysnc (ts) and cam is the same except for using an external sound source (usually a headphone jack on a cinema seat for people with hearing difficulties). This direct sound source is not guaranteed to be a good sound source, because it is interfered by a lot of background noise. Many times ts are recorded in empty theaters or in professional projection cameras, so the image quality may be better than cam. Quality fluctuations can be significant, it is best to check the sample before downloading. The above is the "gun version" we often say, and a large percentage of ts are incorrectly marked from cam. Nowadays, few people use cam mark. Most of the videos shot from the screen with video camera are marked with ts. This version has poor picture quality and has a lot of background noise.

telecine (tc): Use a television movie machine to digitally copy directly from film. The image and sound quality should be good. Ac3 audio encoding is often used. You need an ac3 audio decoder to watch. Usually the correct aspect ratio (2.35: 1) is used, but sometimes there is a tc of 4: 3. This is the film version that is often misunderstood as dvdrip. This version often appears in the movie for about a month. The picture effect is better than the ts version. The sound effect is no different from the real dvdrip. However, because the way of transcription is still used, the picture clarity, picture color, contrast, and frame number are not as good as those of the dvdrip version.