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MP4, full mpeg-4 ‘ts 14, is a kind of using the multimedia computer mpeg-4 format, vice shift in storage, called. The MP4 video digital audio and digital.
In addition, MP4 and understanding to MP4 player, MP4 player is a collection of audio, video, images, e-books, radio is a player. About the concept, it is a long story exactly MP4, because both from the brand, market, MP4 product specification, standard etc, can use a word to describe - “mess”. Speculation is not in now, or business, as long as you can with eyes while video player, MP4, this is easy.
Actually, MP4 player is an able to play the files to mpeg-4 PV equipment, it can be called. Video Player, individual Personal (Video Player) can also be called PMP Portable Media Player (, Portable Media Player). Now the function to MP4 player without specific definition, although many vendors will it defined as multimedia video player, but it is not only listen to the basic function of the movie the music playback, browse pictures support, even part of the product can surf the Internet.
But in order to emphasize the portable, here we feature discussed the MP4 player will play with portable, video as criterion, they can through the USB or 1394 ports, very convenient to transport documents will be video files downloaded to equipment, and shall be in play, in order to satisfy the cabin LCD screen at video playback.
Posted 11 months, 2 weeks ago. Add a comment
MP4 player is using DSP (Digital signal processor) to complete the signing Processer Digital transmission and decoding MP4 files with the task. The data transmission over a walkman DSP device interface control, documents, etc. Decoding playback DSP in a very short time to finish the task of, and the process of energy consumed little (which is suitable for portable player, it is a significant features). First to MP4 songs from memory and file storage, read the signal to decoding chips for signal decoding - by digital-to-analog converters will solve it digital signal converted into analog signals - again after conversion of analog audio amplifier “low-pass filter to export, after the headset output is what we hear the music
Audio MP4 format:
AAC Originally a MP4 MPEG audio formats, and 4 - not big, like MP3 and MPEG - 3 no relationship. MP3 is MPEG Audio Layer 3-1, the abbreviation, But the MP4 MPEG - 2 AAC, is completely is an audio compression formats, such as the increase of stereo perfect, multimedia control, noise and other new features, and most importantly, MP4 through special technology of digital copyright protection, it is MP3 and incomparable.
Video MP4 format:
mpeg-4 Now on the market in multimedia player to MP4 most, can play AAC, it can be seen. Even a media said the MP4 MPEG4 abbreviations, it is a fallacy before, but after the hype, the businessman unceasingly the truth will become the fallacy. Now if you hear this word, computer city MP4 video format is absolutely can play the concept of multimedia player, not to play audio MP4 AAC walkman.
This strange phenomenon is not without reason, have already mentioned above copyright protection function, AAC also many record company, the reasons to support AAC to his players to support, support AAC pay certain patent, copyright or other sources of AAC, is also a problem, don’t like MP3 so open source, so little, online at audio MP4 player development is not mature, in view of the above situation, the businessman simply “rebirthing”, MP4 equates to mpeg-4 abbreviated terms, this is exactly the MP4 is the next generation of MP3 this rule, besides MP3 music playback function of outside, still have the strong mpeg-4 video playback capability, in addition, just “4″ in “3″, from this perspective, the MP4 equates to mpeg-4 is reasonable.
Posted 11 months, 2 weeks ago. Add a comment
Video playback, MP4 actulaay MP3 This player is not actually are, in essence, MP4 video playback is merely MP3 player, the accessory function, called the MP4, purely business.
This greatly small screens (limitations player 0.8-1.8 inches), small volume, support flash specific format (MTV, MP4, MPV and etc.), and most of the DMV is adopted CSTN OLED and etc, so accurately low-end screen, it can only be called said can play video MP3. A: F12R DEC, JinBang dazzle colour, PISA dazzle colour airships 3E E1000 and etc.
Hard disk type MP4 :
It is easy to make you look hard disk medium. Tatu accommodate, have never worry enough disk space. Hard disk MP4 generally has integrated many other functions, for example, digital camera, video camera, LuYinBi, digital partner… But the mp4 than mainstream flash your mp4, usually without considering no 1000.
Flash type MP4 Contrast:
flash disk type MP4 in memory of the MP4 for storage media with this MP4 generally support in a flash card extend, are generally SD card or TF card. Flash light relatively small type MP4 much cheaper than ordinary MP4, several times.
No screen to MP4 :
some firms think MP4 3.5 inch screen is too small, high quality video appear cold Chen, another type of memory for the MP4-256M, also a 128 can appreciate, so these large manufacturers designed a kind of hard disk, the MP4 screen to MP4 can AV output terminals output to such as TV screens, and USES is 2.5 inches on disk volume, big, but for this does not emphasize mobility, volume on the MP4 than traditional DVD confidential cabinet on market, only a very few decades, with the capacity of G MP4, but the price and flash type MP4 phase. For example, love visual MP4
Posted 11 months, 2 weeks ago. Add a comment
From the principle, MP4, but with little difference between MP3, both hardware performance from far, mainly because the video playback function, Divx Xvid and etc.
The broadcast mpeg-4 requirements, the CPU and DSP high processing capacity, and should have certain system memory, Divx encoder, encoder developers came to use the main 400MHz more computer to complete the decoding chips, MP4 requirement has high computing performance, many MP4 luxuriant interface will consume plenty of system resources, MP4 video data and image is not only the data processor, now the MP4 or many digital multimedia function and the unity, to realize the function forms, for example, digital video collection, partner, please, FM, DC… Even some MP4 also supports multiple lines. So the MP4 chip requires not only has high computing power and integrated many functions.
Because the core chip making, MP4 high level technology, so the MP4 manufacturers are powerless, these core generally by traditional chip making, Intel, as you design, Sigma TI, even AMD also has introduced the MP4 - special processing chip AU1200. At present the MP4 mainly adopts the scheme is TI Wintel and complete hardware and software solutions.
Texas Instruments, TI (mobile entertainment) is the chip giant, and equipment of the chip giant Intel desktop platforms, because TI start early, so now mostly MP4 are using TI chip solutions occupied most of the market share. Although the hardware have certain standard, but the software system has no unified standard, but all their business development (mostly Linux), this is also one of chaos “made great cause. Now most manufacturers are using TI, major is visible, and Europe and the love of SONY, Toshiba, digital manufacturers.
And Wintel strong-strong union, launched a new standard, the central processor PMC contractor by Intel’s XScale series, Microsoft’s Windows software system is Portable Media Center system, software and hardware are unified standards, fully embodies into Portable Media market, Microsoft Windows system, due to an ambitious Portable Media, the whole framework of open, so can the operating system on the basis of the application software extensions. Wintel antipathy, unified industry standards, to a certain extent FaZhanDian clear direction to MP4. At present the solutions of the support, set, samsung and iRiver innovation etc
Posted 11 months, 2 weeks ago. Add a comment
