Malata SG6 1 10 Why can't the downloaded AVI be played when the mobile phone comes with AVI format movies?

Let's talk about the formats supported by your mobile phone first. There is no difference between your mobile phone and mp4 player. You can find the answer:

Different MP4 players can support different video formats. Most products can support MPEG-4, AVI, ASF, WMV and other video files. Of course, many products can also support audio files in MP3 and WMA formats. But in fact, most products do not fully support these formats. Take AVI format as an example, this is just a general concept. AVI includes DIVX, XVID and other formats, which are not supported by many MP4 players.

Even if the format file is within the scope of support, MP4 player may not be able to play it, which involves the problem of resolution. Many MP4 players are not compatible with various resolutions. These MP4 players can't play normally when they encounter some files with different resolution from the default resolution of the machine. Many friends who own MP4 products often encounter this situation. The video downloaded from the Internet can't be played in MP4 player, or there is only sound but no image. Many MP4 products have poor resolution compatibility, which requires software conversion to achieve normal playback, which also restricts the development of MP4 players.

When it comes to the popular format of video files, RM format is naturally mentioned. There are many resources of such video files on the Internet. Because of copyright and other issues, basically MP4 players can't support RM playback, which greatly restricts the development of MP4.

Watching movies on this machine, you can use your own conversion software.

Let's take a look at the avi format:

AVI digital video format

AVI (Audio Video Interlaced) is a digital video file format, which is used for audio and video interlaced recording. At the beginning of 1992, Microsoft introduced AVI technology and its application software VFW(Video for Windows). In AVI files, moving images and audio data are stored in a staggered way and are independent of hardware devices. This way of organizing audio and video data in an alternating way can obtain continuous information from the storage medium more effectively when reading the video data stream. The main parameters of AVI file include video parameters, sound parameters and compression parameters.

I. Video parameters

1, video size: according to different application requirements, the window size or resolution of AVI can be adjusted according to the ratio of 4: 3 or at will: as large as full screen 640×480, as small as 160× 120 or even lower. The larger the window, the larger the data volume of the video file.

2. Frames per second: The frame rate can also be adjusted, which is directly proportional to the amount of data. Different frame rates will produce different picture continuity effects.

2. Sound parameters: In the AVI file, video and sound are stored separately, so the video in one video can be merged with the sound in another video. AVI file is closely related to WAV file, because WAV file is the source of sound signal in AVI file. The basic parameters of sound are the parameters of WAV file format. In addition, the AVI file also includes other parameters related to audio:

1. Interleave audio every x frames. Audio signals stored in AVI format are interleaved once every x frames, that is, the frequency x of audio-video alternation is an adjustable parameter, and the minimum value of x is one frame, that is, each frame of video and audio data are interleaved, which is the default value used on optical discs. The smaller the interleaving parameter is, the fewer data streams are read from the memory when playing back AVI files, and the playback is easier to be continuous. Therefore, if the data transmission rate of AVI file storage platform is high, the interleaving parameters can be set higher. When the AVI file is stored on the hard disk, that is, when the AVI file is read from the hard disk and played, a larger interleaving frequency can be used, such as several frames or even 1 second.

2, Synchronization control (synchronization)

In AVI files, video and sound are synchronized. However, when playing AVI files in MPC, the video and sound may be out of sync.

3. Compression parameters: the original analog video can be collected without compression, so as to obtain the best image quality. After editing, appropriate compression parameters should be selected according to the application environment.

Characteristics of AVI digital video

AVI and its player VFW have become the most commonly used video data format on PC, because it has the following remarkable characteristics:

First, provide hardware-free video playback function: AVI format and VFW software are designed for the current MPC, but they can be continuously improved to adapt to the development of MPC. According to the parameters of AVI format, the window size and frame rate can be adjusted according to the hardware capability and processing speed of the playback environment. When playing on a low-end MPC computer or network, the window of VFW can be very small, and the number of colors and frame rate can be very low; On the Pentium-class system, the playback rate of compressed video data with 64K color and 320×240 can reach 25 frames per second. In this way, VFW can be applied to different hardware platforms, so that users can edit and replay digital video information on ordinary MPC without expensive special hardware equipment.

2. Realize synchronous control and real-time playback: Through synchronous control parameters, AVI can adjust itself to adapt to the playback environment. If the processing capacity of MPC is not high enough and the data rate of AVI file is high, then when playing this AVI file in WINDOWS environment, the player can achieve the effect of video and audio synchronization by dropping frames and adjusting the actual data rate of AVI.

Thirdly, the AVI files stored on the hard disk and the optical disk can be played efficiently: due to the cross storage of AVI data, VFW only needs to occupy a limited memory space when playing AVI data, because the player can read and play the video data on the hard disk or the optical disk at the same time, without loading large-capacity video data into the memory in advance. When playing AVI video data, only a few video images and some audio data need to be accessed within a specified time. This method can not only improve the working efficiency of the system, but also realize the fast loading and starting of the playback program and reduce the waiting time of users when playing AVI video data.

Fourthly, an open AVI digital video file structure is provided: AVI file structure not only solves the synchronization problem of audio and video, but also has the characteristics of universality and openness. It can work in any Windows environment, and it also has the function of extending the environment. Users can develop their own AVI video files, which can be called at any time in the Windows environment.

5.AVI files can be re-edited: AVI generally adopts intra-frame lossy compression, and can be re-edited by general video editing software such as Adobe Premiere or MediaStudio.

Let me introduce you to the video format of the mobile phone:

AVI, RM and WMV are suitable for smartphones with memory cards and operating systems. Advantages: good video quality, disadvantages: large file.

MP4 is suitable for all mobile phones, especially those with memory cards. Advantages: the image is clear. The file size is moderate.

3GP is suitable for all mobile phones, especially those with small memory. Advantages: small file.

Many people have a misunderstanding about 3GPP, that is, the quality is poor! Actually, it is not. The quality of video is related to many factors, such as the quality of source files and the parameters set during conversion. . . . The poor sound quality of many 3GP videos is mainly because the audio setting is "voice" instead of "stereo AAC". Especially Nokia's video converter doesn't have AAC at all. So many people feel uncomfortable when they hear 3GP.

3GP is the format of communication industry standard protocol. The biggest advantage is that video files can be compressed very small! But at the same time, the video quality will be lost! But not all 3GP videos are bad.

The quality of a video is directly proportional to the size of the video file! ! ! Let me give you an example: a 4-minute MTV is converted into audio, set to "voice mono", the video is H.263, and the file is about 2M, or even smaller (if the video parameters are set lower)! But if the video is set to MPEG_4, the audio is AAC_96k, and the file size is about 5M, or even larger! This also means that the higher the video and audio setting parameters, the better the video quality and the larger the file!

As for what video format you choose to send to your favorite mobile phone, it depends on the capabilities and needs of your mobile phone!

The above is my personal opinion, for reference only, please advise if there is anything wrong! ! !

Brief introduction of 3rd generation mobile communication standardization partnership project (3GPP and 3GPP2);

3GPP(3G Partnership Project): The organization was established in February, 1998. It consists of five standards: ETSI in Europe, ARIB in Japan, TTC in Japan, TTA in South Korea and T 1 in the United States.

Mainly formulate the third generation technical specifications based on GSM core network and UTRA (FDD is W-CDMA technology, TDD is TD-CDMA technology).

3Gpp2: The organization was founded in June of 1999 1, and was initiated by four standardization organizations: TIA in the United States, ARIB in Japan, TTC in Japan and TTA in South Korea. The third generation technical specification based on ANSI-4 1 core network and CDMA2000 as wireless interface is mainly formulated.

At present, the research on services, wireless interfaces, core networks and terminals of 3GPP and 3GPP2 is progressing rapidly and activities are frequent.

China Wireless Communication Standards Research Group (CWTS) officially signed the contract in June 1999, and joined 3GPP and 3GPP2 at the same time, becoming the organization partner mainly responsible for 3rd generation partnership project. Prior to this, China participated in the standardization activities of these two partners as an observer.

At present, many people are making many MP4s for PSP, and this format can also be supported by many PADs and mobile phones. What's wrong with this format Many people don't know, even the experts of tgfcer don't know. Therefore, it is necessary to make clear the names of many MP4s, and explain MPEG- 1, MPEG-2, Microsoft's AVI, WMV and ASF to everyone, so that everyone will not be arrogant when making MP4s for PSPs in the future.

The emergence of digital images benefits from the development of two technologies: optical disk storage technology and image digital compression technology. The storage technology of optical disc has changed from CD, VCD, SVCD and MD to popular DVD, and then to HD-DVD, BLUE-DVD and UMD, and its capacity has increased from 700M to nearly 40 g.. Image technology includes MPEG- 1, MPEG-2, MPEG-4 and MPEG-3, as well as Microsoft's ASF, AVI and WMV. There will be MPEG-7 and MPEG-2 1 in the future. Of course, this is another story.

The source of image digital compression technology;

When the television image in NTSC format is transmitted at a quality of about 640× 480,24 bit/pixel and 30 frames per second, the data rate will reach 28 mbit/s, and the uncompressed video image of 20 seconds will occupy 560Mbit of storage space, which is equivalent to a CD that can only store uncompressed TV programs for 20 seconds. Obviously, such a requirement is unacceptable to ordinary individual users, and the cost of implementation is also very high. Therefore, MPEG, a video image compression coding method, came into being.

MPEG:

MPEG (Moving Picture Experts Group) is an international standard, namely ISO 1 1 172. The founder of MPEG originally planned to develop four versions: MPEG- 1 to MPEG-4 to meet the requirements of different bandwidths and digital image quality, but gave up because of MPEG-3. Generally speaking, MPEG is superior to other image compression schemes in its good compatibility, the highest compression ratio is 200: 1, and the data loss is small. After the above 20-second standard NTSC TV image is compressed, at least

That is 560 m/200 = 2.8 m

First of all, first of all, we will explain the MPEG series multimedia coding format as follows:

1、MPEG- 1

Technical features: MPEG- 1 is formulated in 1992, which can be applied to devices with different bandwidths, such as CD-ROM, Video-CD and CD-i. Its purpose is to compress the NTSC image of 22 1 mbit/s to1.2mbit/s. This is an image compression standard recognized by the industry. Can be used for SIF standard resolution (NTSC system 352× 240; PAL format is 352×288, which is different from the standard NTSC and PAL TV image size. It can play 30 frames per second (1.5Mbits), and the sound quality of CD is basically equivalent to VHS. (PS: here is bit, not byte, 8bit= 1byte). With the compression algorithm of MPEG- 1, a movie with a length of 120 minutes (excluding video files) can be compressed to about 1.2 GB.

Scope of application: The most successful product using MPEG- 1 technology is VCD, which is widely used and popularized as a low-cost video playback device. MPEG- 1 is also used for video transmission on digital telephone networks, such as ADSL, VOD and educational networks.

2、MPEG-2

Technical features: MPEG-2 is formulated in 1994, and its design goal is high industrial standard image quality and higher transmission rate. MPEG-2 can play data between 30Mbit- 10Mbit at the speed of 30 frames per second, and the resolution can reach 720×486 in NTSC system. MPEG-2 can provide broadcast-level video and CD-level sound quality. MPEG-2 audio coding can provide left, right, middle and two surround channels, as well as an emphasized bass channel and up to seven channels. Another feature of MPEG-2 is that it can provide a wide range of variable compression ratio to meet the requirements of different image quality, storage capacity and bandwidth. Using MPEG-2 compression algorithm to compress a movie with the length of 120 minutes can be compressed to the size of 4 to 8 GB, and the performance index of MPEG- 1 is incomparable.

Scope of application: MPEG-2 technology is the standard technology to realize DVD, and now DVD players are becoming popular in families. MPEG-2 is not only the designated standard of DVD, but also can be used to provide broadcast-grade digital video for broadcasting, cable TV network, cable network and satellite live broadcast.

3、MPEG-3:

Because of its excellent performance, MPEG-2 can be applied to HDTV, which makes MPEG-3 originally designed for HDTV abandoned before it was born. I won't talk about it here.

4、MPEG-4

Technical features: MPEG-4 was released in June 1998 1 1. It not only aims at video and audio coding at a certain bit rate, but also pays more attention to the interactivity and flexibility of multimedia systems. This standard is mainly used for videophone, videoe-mail, etc. , and the requirements for the playback rate are not high. It plays 4800-64000 bits (600 kilobytes/second -8000 kilobytes/second) of data at the speed of 30 frames per second, and the resolution is 176× 144. MPEG-4 uses very narrow bandwidth, and obtains the best image quality with the least data through frame reconstruction technology and data compression.

Scope of application: After two years of development, the most popular application now is to convert MPEG-2 video files in DVD into smaller video files by using the high compression rate and high image reproduction quality of MPEG-4. After this processing, the video quality of the image has not been greatly reduced, but the volume can be reduced several times, so it is very convenient to save the programs on DVD with CD-ROM. In addition, MPEG-4 will play an important role in family photography and video recording and real-time video playback on the Internet.

5. By the way:

Music format MP3:

The coding algorithm of MP3 music compression format is taken from MPEG- 1 Audio Layer 3, that is, it is a part of MPEG- 1 Audio coding algorithm. MP3 has not only high compression rate, but also high fidelity of compressed music, so it is very popular among netizens.

Music format MP4:

MP3 also brings the problem of copyright protection, but its open structure makes MP3 unpopular with audio-visual publishers, so MP4 was born. As early as the end of last century, at & amp； & ampt Company has developed an audio format based on MPEG2-ACC technology: higher compression ratio, better sound quality, and most importantly, this audio format has a unique design for copyright protection and encryption. GMO(Global music one) even launched an audio product based on this technology, and MP4 is the trademark of this audio product, which is mainly used for audio format playback and authorized reproduction. Of course, due to various reasons, MP4 is only a flash in the pan, and soon disappears into the torrent of digital audio. Although MPEG4-4 is usually abbreviated as MP4, there is no relationship between them.

MPEG-2 AAC technology:

Incidentally, the music format MP4 uses MPEG-2 AAC technology (which will be used below), that is, A2B or AAC technology for short. Its characteristics are more perfect sound quality and higher compression ratio (15: 1-20: 1). MPEG-2 AAC can provide high-quality audio coding with optional range of 1 ~ 48 channels when the sampling frequency is 8 ~ 96 kHz. AAC is the abbreviation of advanced audio coding, which is suitable for the coding of multi-channel ultra-high quality audio signals from the telephone voice quality with a bit rate of 8kbps to 160kbps, and allows multimedia coding and decoding. It adds some functions that MP3 does not have, such as perfect stereo reproduction, bit stream effect sound scanning, multimedia control, noise reduction, etc., so that the sound quality of CD can be perfectly reproduced after audio compression.

6、MPEG-7

Accurately speaking, MPEG-7 is not a compression coding method, but a multimedia content description interface. After MPEG-4, the contradiction to be solved is the management and quick search of the increasingly huge image and sound information. MPEG7 is the solution to this contradiction. MPEG-7 strives to search for different types of multimedia video materials that users need quickly and effectively, such as searching for clips with Three Gorges shots in video materials. It is expected that this scheme will be finally completed and published in early 20001.

7、MPEG-2 1

MPEG-2 1 will be developed from MPEG-7 and just started. According to reports, MPEG-2 1 mainly stipulates the online real-time exchange protocol of digital programs.

Secondly, talk about several audio and video formats of Microsoft AVI, ASF and WMV.

AVI format

It is an independent coding method of AVI technical standard WIN 3. 1992 introduced by Microsoft. This is a digital video format in which audio and video are recorded alternately. If it is collected in AVI format and then compressed into MPEG- 1 or MPEG-2 or MPEG-4 format, the image will be clearer than real-time compression. Therefore, it uses intra-frame compression coding to make the image clear and easy to edit by editing software. The disadvantage is that it needs a lot of storage space. That is to say, people usually directly compress analog TV signals into MPEG-I, and the appearance of AVI is inserted in this direct conversion to improve the definition of compressed images.

Wild mumps virus

It is also a technical standard for real-time multimedia transmission on the Internet independent of coding methods, and Microsoft hopes to use it to replace technical standards such as QuickTime. Usually, people use WAV (note that' A' is Microsoft's independent audio format like AIV) and AVI format as extensions. The main advantages of WMV include: local or network playback, extensible media types, component download, extensible media types, stream priority, multilingual support, environmental independence, rich inter-stream relationships and scalability.

ASF

The full name of ASF is Advanced Streaming Format, which should be used literally. It is a media playing format developed by Microsoft. After all, ASF is a file compression format developed by Microsoft to compete with the current Real player, and you can watch video programs directly online! Because it uses the compression algorithm of MPEG4 4. So the compression ratio and image quality are good. Because ASF exists in a video "streaming" format that can be watched instantly on the Internet, it is not surprising that its picture quality is worse than that of VCD, but it is better than that of RAM format which is also a video "streaming" format. However, it is not surprising that the generated video file is superior to VCD (MPEG 1) if the best quality compressed file is selected regardless of online transmission. However, in this case, the original intention of ASF development is lost, and Windows Media On-Demand Producer is a free software for making ASF files. ASF can use MPEG4-4 algorithm to compress 120-minute movies (without video files) into a video stream of about 300M.

Third, the darling of today's audio-visual format "DivX-)"

History:

*1998165438+1the international standard of MPEG-4 was released in October.

* 1999 Microsoft developed MPEG-4CODEC (codec platform) for Windows Media.

* In February 2000, 27-year-old French film lover and hacker Je{AAC}ro{ACI}me Rota jointly developed a new video codec platform based on MPEG-4 and cooperated with them.

When the download is opened on the network. This is today's famous DivX-) codec.

Explain in detail:

DivX-) is an audio and video storage format, audio and video media, and its biggest purpose is to save high-quality movies and communicate on the Internet. Its characteristics are as follows:

File type: in most cases, it is saved as an AVI file. This AVI is completely different from Microsoft's AVI. We all know that.

Resolution: optional and interchangeable: 5 12x384(4:3 pictures), 640x275 22.35: 1 pictures).

Audio: Open function. Lame MP3(VBR), Dobly Digtal(AC3), etc. DivX-) Audio, PCM, MP3, DTS, etc.

Code stream (capacity): It depends on the resolution and specific coding settings.

Quality: video quality is close to DVD level, surpassing VCD and LD; Audio can reach CD quality (48kHz, 96kBits, stereo) or multi-channel digital sound (such as Dobly).

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System configuration: 300MHz CPU, 64M memory and 8M video memory. After installing the corresponding DivX codec, the system can be played with Media Player6.4+ or special playing software.

Coding efficiency: PII-350 system is about 1-2 frames per second.

The development of DivX-) codec actually appropriated the coding cores of Microsoft MPEG 4V3 4. 1.00.4920 low motion and 4. 1.00.438+07 fast motion. After several months of modification and a series of updated versions, DivX-) now works and runs on all major operating platforms, including DivX versions of Windows, Macintosh, Linux and BeOS.

The MPEG-4 coding and compression technology used in DivX- video coding is a lossy video compression technology with high compression ratio. Used to compress a DVD with a capacity of 5- 10G. Only 1-2 CDROM are needed to maintain the same resolution and AC3 trajectory, and the compression ratio is close to 10: 1. High compression ratio makes it easier and cheaper for individuals to save high-quality movies, and DivX-) is quickly accepted and widely used by netizens. The internet is more like DivX-), which provides unlimited development space. Now there are five or six newly released movies on every DivX website. -) format loop. High-definition images and relatively small files attract tens of millions of people. Internet surfers can easily exchange high-quality audio and video enjoyment as long as they stay at home. It is also easier for friends to have interesting and relaxed audio-visual communication. You know, the popularity of DivX is just beginning.

4. Other encoding and decoding formats with the seldom used MPEG4-4 as the core.

Besides DivX, MPEG-4 files in the final MPEG-4 format of smr(navi) and angelpotion often appear on the Internet. Smr is similar to DivX, based on Microsoft MPEG4-4 video codec, but its hardware requirements are lower than DivX, and the generated file is smaller than DivX, which is realized at the expense of image quality. Angel motion definitive MPEG4-4 can be encoded and decoded without the help of Microsoft MPEG4 video codec, and the compression speed is slightly faster than DivX, with no obvious difference in image quality. Another feature of angel motion is that it is compatible with Microsoft MPEG-4 and DivX. With angel motion, you can directly make movies in DivX format.

Five, today's protagonist PSP, some PDA, some mobile phones support MP4.

1, Several Confused MP4 Concepts

1) and audio format MP4.

This was mentioned when MP3 was launched. This MP4 is in audio format.

2) It is different from many portable MP4 players on the market.

The first type: It is obviously not a machine that plays MP4 music, but an emerging hardware product of some manufacturers. These MP4 players are still in the primary stage, and their hardware configurations are different, so the standard definition of MP4 players is strange. Some manufacturers call MP3 players without flash memory MP4. In fact, they can only play MP3 haha, using external memory cards or USB flash drives as storage media. This MP4 player is considered as a seamless connection between computer digital products and household appliances.

Secondly, some manufacturers define MP4 players as multimedia audio-visual centers that can not only listen, but also watch or have stronger functions. At present, although the standard of MP4 players has not yet been determined, some internationally renowned manufacturers have been eager to launch various new products to seize the camp of MP4 players. Most of them are hard disks, which can play MPEG-4 video and audio files. Most MP4s of domestic brands play DivX. -) MPEG-4, some of which even have DV and DV functions, has the momentum of leading the future trend of MP4 players, making the fallacy that MP4 is short for MPEG-4 more real and making MP4 players a new generation of MPEG-4 portable devices. Actually, it's not much. If it develops, whoever uses it more will be kinder than the first one.

The third type: MP4 produced by big manufacturers and MPEG-4 portable devices on the market. In addition to the above two products, there are PMP (Portable Media Player) and PMC (Portable Media Center). Among them, PMC is supported by Microsoft behind the scenes, and of course it is also driven by ASF of Mircosoft. Some international manufacturers that have launched MP4 products have also launched corresponding PMC products.

3) By the way

Support DivX-) these players, general hardware decoding, we all know that DivX-) supports more and upgrades quickly, and the new DivX-) format is not supported as soon as it comes out. So don't buy this MP4 player.

PMC products only need to upgrade software operation. Similarly, the upgrading of other audio and video file formats and picture formats has been bothering MP4 players. PMC is an open product because it uses Microsoft's operating system. It is more like a multimedia audio-visual player with simple PDA function, and its upgrade and expansion ability is beyond doubt. Thanks to the good compatibility of Microsoft operating system, the expansion performance of PMC products is also quite excellent. DC and DV are not a problem, and more excellent functions can be extended through advanced technologies such as infrared and Bluetooth.

I don't know what will happen in the future, but please accept my advice and don't buy an MP4 player for the time being. After all, it is still in the development stage. The standard hasn't been decided yet.

2. What does Apple's QuickTime support MP4?

We also found that MP4 files used by PSP can be played under QuickTime, that is to say, PSP, some PDA and some mobile phones use the same format as QuickTime. What format is this? What does it have to do with MPEG-4? Why can't WindowsMediaPlay play? Different from DivX-)? Obviously, MP4 supported by PSP and MP4 file supported by QuickTime have the same encoding format. This MP4 is a combination of standard MPEG-4 video coding and MPEG-2 AAC technology. (MPEG-2 AAC technology) is different from DivX. -) So QuickTime can't play modified MPEG-4 files such as DivX-) avi and Microsoft ASF. But both of them are derived from MPEG-4 standard.

3. What is 3GPP?

1)3G

3G third generation communication protocol. New generation mobile high transmission bandwidth wireless communication protocol

2)3GPP

3G peer-to-peer protocol is a standard for creating, transmitting and playing multimedia based on 3G mobile communication network. This standard is based on MPEG-4 coding technology. Many MPEG-4 standards on the market can be used for 3G mobile communication devices as long as they support 3GPP.

4. Introduction of Sony Image Converter.

This software is basically used to convert wmv, asf, avi, mepg and other files into mp4, and there are not many supported input formats.

Your Malata SG6 1 10 should support 3gp and mp4! ! ! ! !

So tired! ! ! ! ! ! ! ! ! ~~~~~~~~~