*. MpEG/. mpg/. dat
MPEG is also the abbreviation of Motion Picture Experts Group. This type of format includes a variety of video formats including MPEG-1, MPEG-2 and MPEG-4. MPEG-1 is believed to be the most contact, because it is widely used in
For VCD production and some network applications for video clip download, most of the VCD files are compressed in mpeg1 format (the recording software automatically converts mpeg1. dat format), using the MPEG-1 compression algorithm, can put a 120 minute long
The film size is compressed to around 1.2 GB. MPEG-2 is applied in the production of DVD, at the same time in some HDTV (high definition television broadcasting) and some demanding video editing, processing there are also a considerable number of applications. Use the compression algorithm of MPEG-2 to compress
A 120-minute-long movie can be compressed to a 5-8 GB size (MPEG2's image quality MPEG-1 is unmatched ).
*. Avi
Avi, short for audio video interleaved. Avi, a video format published by Microsoft, has been in the video field for several years. The AVI format is easy to call and the image quality is good, but the disadvantage is the file size.
Too large
*. RA/RM/Ram
*. Rm, one of the audio/video compression specifications developed by Real Networks, what real player can do is to use Internet resources to broadcast live audio/video that meets the Real Media technical specifications. In real
Media specifications mainly include three types of files: RealAudio, real video, and real Flash (a new generation of high compression ratio animation formats jointly launched by Real Networks and Macromedia ). Real Video (RA, Ram)
Positioning is applied to video streams. It can be said that it is the pioneer of video stream technology. It can enable uninterrupted video playback using 56 K modem dial-up Internet access, but its image quality is worse than that of VCD. If you have seen those RM Compression
The album can be clearly compared.
*. Rmvb is a video file format. In rmvb, VB refers to VBR and Variable Bit Rate (bit rate that can be changed), which is much clearer than the previous RM format, the reason is that it reduces the bit rate on the static screen and can be played using RealPlayer.
Play with software.
The common RM format is the real8.0 format, which uses fixed bit rate encoding. Multiple devices are used in VCD-rm, which has become popular for some time. However, due to the inherent deficiency of the VCD source, it is not clear enough, so the pressure RM will not be clear. Especially Standard online
225kbps bit rate, the definition is terrible.
Rmvb has one more VB than RM. VB refers to variable bit, which means dynamic bit rate! It is the new encoding format 9.0 of real. Rmvb (real9.0) and RM (real8.0) are still in 8.0 format in audio encoding.
We use at least 32 Kbps of sterero music for compression, usually 44 KB, useful for the MTV class to 96 kb, and there is no need to compress it if it is higher!
*. Mov
How many friends who have used Mac machines should have access to QuickTime. QuickTime was originally an image and video processing software developed by Apple for Mac computers. Quick-time provides two standard image and digital video formats, that is, it supports static
*. PIC and *. jpg image formats, dynamic *. mov Based on Indeo compression method, and *. mpg video format based on Mpeg Compression Method.
*. ASF
ASF (Advanced Streaming Format advanced stream format ). ASF is a File compression format developed by Microsoft to compete with Real Player. ASF uses MPEG4
Compression Algorithm, compression ratio and image quality are both good. Because ASF is a video "stream" format that can be instantly watched on the Internet, its image quality is slightly inferior to that of VCD, but its image quality is slightly inferior to that of RAM in the same video "stream" format.
The format is better.
*. Wmv
Microsoft wants to replace the technical standards such as QuickTime and the file extensions such as WAV and AVI with the technical standards that spread multimedia in real time on the Internet independently of the encoding method. The main advantage of WMV is: scalable media
Media type, local or network playback, scalable media type, streaming priority, multi-language support, and scalability.
*. AVI (n avi)
If you find that the original playback software suddenly cannot open AVI files of this type, you should consider whether you have encountered n Avi. N Avi, short for new AVI, is a new video lattice developed by an underground organization named shadow realm.
. It was modified by the Microsoft ASF compression algorithm (not the AVI in the imagination), and the video format pursued the compression ratio and image quality, so Navi pursued this goal, improved some deficiencies in the original ASF format,
So that Navi can have a higher frame rate. In this case, Navi is an improved ASF format that removes the video stream feature.
*. MKV
MKV is actually a media file of matroska. matroska is a new multimedia Encapsulation Format, it can encapsulate a variety of videos of different encoding, more than 16 audio streams of different formats, and Subtitle streams of different languages into a matroska media file.
Medium!
MKV is not a compression format. MKV is actually a new multimedia Encapsulation Format, also known as multimedia container ). It is different from DivX, Xvid, and other video encoding formats, as well as MP3, Ogg, and other audio encoding formats. MKV
It only provides a "Combination" and "encapsulation" format for these audios and videos. In other words, it is a container format. Common aVL, vob, MPEG, and RM formats also belong to this type. But they are either outdated or not open enough.
This has led to the birth of a new multimedia Encapsulation Format such as MKV.
*. FLV
FLV is short for Flash video. FLV streaming media is a new video format called Flash video. Because of its extremely small file size and extremely fast loading speed, it is possible to watch video files on the network, and its appearance effectively solves the problem.
After video files are imported into flash, the exported SWF files are bulky and cannot be used well on the network.
Currently, all online video websites use this video format. Such as Sina podcast, 56, Youku, Tudou, cool 6, and YouTube, without exception. FLV has become the mainstream video file format.
FLV is a video format developed with the release of Flash MX. It is currently used by many new-generation video sharing websites and is the fastest growing and most widely used video communication format. Based on the compression algorithm developed by Sorenson
. The FLV format is not only easy to import to flash, but also extremely fast, and can protect copyright, and can play videos without using a local Microsoft or Real Player.
Common video encoding:
1. Microsoft RLE
An 8-bit encoding method that supports up to 256 colors. It can be used to encode materials with large area color blocks, such as compressed animation or computer-synthesized images. It is a lossless compression solution.
2. Microsoft Video 1
It is used to compress a simulated video. It is a lossy compression solution with a maximum of 256 colors. Its quality can be imagined. Generally, we should not use it to encode Avi.
3. Microsoft H.261 and H.263 Video Codec
Codec used for video conferencing. H.261 is applicable to ISDN and DDN lines, and H.263 is applicable to lan. However, codec is generally used for playing and cannot be used for encoding.
4. Intel Indeo video r3.2
All Windows versions can use Indeo video 3.2 to play AVI encoding. It is more compressed than cinepak, but the computer that needs to be played back is faster than cinepak.
5. Intel Indeo video 4 and 5
There are two common types: 4.5 and 5.10, which are better than cinepak and r3.2 and can adapt to networks with different bandwidths. However, a corresponding decoder plug-in is required to smoothly play the downloaded files. Suitable for machines with Intel MMX or above CPUs.
Excellent results. If you must use Avi, we recommend that you use 5.10. In the case of almost the same effect, it has a faster encoding speed and a higher compression ratio.
6. Intel iyuv Codec
The image quality obtained using this method is excellent, because this method changes the normal RGB color mode to a more compact YUV color mode. If you want to compress Avi into a MPEG-1, you can use it to achieve better results, but its generated file is too large.
7. Microsoft MPEG-4 Video Codec
There are common 1.0, 2.0, 3.0 three versions, of course, based on MPEG-4 technology, of which 3.0 is not used for AVI encoding, can only be used to generate ASF files that support the "Video Stream" technology.
8. DivX-MPEG-4 low-motion/fast-Motion
The actual and Microsoft MPEG-4 video code is equivalent, but low-motion uses a fixed bit rate, fast-motion uses dynamic bit rate, the AVI compressed by the latter is almost half of the former, but the quality is lower. Low-
Motion is suitable for converting DVDs to ensure better picture quality, and fast-motion is used to convert VCD to reflect the advantages of a MPEG-4 that is short and lean.
9. DivX 3.11/4.12/5.0
It is actually DivX, which was originally developed to break Microsoft's ASF specification. Now the development team has become divxnetworks, so it is constantly introducing new versions, the biggest feature is the addition of 1-pass and 2-
2-Pass is equivalent to two encodings to maximize the balance between network bandwidth and visual effect.
10. MPEG4: The MPEG-4 standard is mainly used in video phone, video email and electronic news, which has low transmission rate requirements, between 4800-64000bits/sec, the resolution is
176x144. MPEG-4 uses very narrow bandwidth, frame Reconstruction Technology, compression and transmission of data, in order to obtain the best image quality with the least data.
11. h263: 263 is a draft standard of ITU ITU-T and is designed for low-bitrate communication. But in fact, this standard can be used in a wide bitstream range, rather than for low-bitstream applications only. H.263 uses unrestricted motion vectors and syntax-based
Arithmetic Coding, frame prediction method with the same advance prediction and P-B frame in MPEG. H.263 supports five resolutions: qcif and CIF, and sqcif, 4cif, and 16cif.
12. h. 264 is the Joint Video group (JVT: Joint Video Team) jointly established by the ITU-T's VCEG (Video Coding Experts Group) and the MPEG (Motion Picture Experts Group) of ISO/IEC) the new suggestions jointly developed are equivalent
Part10 for the ISO MPEG-4. It can be said that 264 is the development and continuation of 263, while absorbing some advantages of MPEG.
Comparison: Compared with H.263 and H.264, MPEG4 is relatively simple and has the lowest requirement on the system, but has the worst effect. Compared with the other two types of codes, this encoding method has little advantage. I will not talk about it much. I mainly talk about 263 and 264.
13. on2 VP6/7
The popular video sharing website in basically adopted the Flash version 8 video solution, while Flash version 8 used the on2 VP6 video codec.
14. wmv9/VC-1
VC-1: Microsoft donated its proprietary wmv9 (Windows Media video 9) to the American Association of film and television engineers in order to enter the global consumer electronics, film and television markets) video Coding Standard, wmv9 shake into the international standard VC-1.
15x264
X264 is an international standard H.264 Encoder and is an open-source encoder. Thanks to H.264's efficient compression performance and x264's efficient (fast coding speed) implementation, x264 is widely used in the DVDRip field. Currently, the commonly used corresponding decoder is coreavc decoder and FFMPEG libavcodec.
