What is DVDrip?

DVD we all know that is a very good media formats, MPEG2 video codec; AC3, DTS audio tracks. We also know that the carrier is a DVD disc, D5 have 4.7G capacity. Clearly, transfer DVD file on network directly without practical value, such files will occupy on the server's space and a lot of network bandwidth.

This requires a rip, strip out DVD video, audio, subtitles, after compression or other processing, then re-synthesized into a multimedia file. Get the smaller file size to a DVD audio-visual enjoyment.

To reduce file size, even better quality and sound, need video and audio compression which uses a variety of video and audio codec.

Video coding, Microsoft MPEG4, that is the ancestor of this area, we are familiar with DivX, Xvid are developed on the basis it up. To an MPEG4-based codec there are Windows Media Video 9, DivX, Xvid, etc. In particular, Divx and Xvid, they are open-source developed the most complete and rich. Divx / Xvid-encoded video files, not only it's picture quality is very good, and can be synthesized with a variety of audio file formats, supports multiple tracks, multiple subtitles, there is a lot of plug-ins support.

There is also a very important Real encoder should mention, from the beginning Real RV9 encoder has been a qualitative leap, with and Divx / Xvid against strength. Its performance in low bit rate by a lot of people pro-gaze. However, due to RV9/10 is closed, RV9/10 encoded files only use RV9/10 audio formats, plug-in subtitles is also very troublesome. In particular RV9 audio ineffective for everyone criticized, RV10 finally came to terms with the improvement in audio. But, after all Divx / Xvid is more free and convenient.

The most common audio encoder is MP3; Lame MP3 encoder is the leader in this area, in addition to WMA, AAC, and RA and so on.

The DVD video and audio are encoded synthesis to get a DVDrip new multimedia files. Normal circumstances, use MPEG4 encoder, just need two piece of CDROM disc to store DVD contents. So you can enjoy DVD audio on the minimal cost. It should be mentioned that avi, on the Windows platform was a very old media formats. Now avi has shrunk, as a multimedia container format, avi has become a new format. Avi as a container to allow use Xvid, Divx, VP6 encoded video formats, as well as mp3, AC3 encoded audio formats. Because DVDrip avi now become a hodgepodge of multimedia formats.

In addition DVDrip can also be linked to the same as the DVD subtitles, DVDrip subtitles can be divided into external and built-in subtitles, the built-in video compression is pressed when the subtitles to the video file, so you can not hide and switching subtitles. Plug-in subtitles do not have these drawbacks, subtitles divided into soft and hard subtitles. Soft subtitles is some text file, you can easily modify. Hard subtitles subtitle itself is a collection of pictures, can not modify the content of subtitles. Subtitle plug-ins need subtitles to display subtitles on the player.

Perhaps because RV9/10 encoded RMVB file extension is not avi, and does not support multiple audio tracks, do not have channel switching, and can not easily switch the subtitles. rmvb DVDrip often excluded from the scope. In fact, DVDrip as a DVD backup technology, some broader definition, the DVD video, audio, subtitles stripped out, after compression or other processing, then re-synthesized into a multimedia file, we should be able to call DVDrip.