[HD MP4] The classification of MP4 players identifies three major standards for HD MP4
Classification of MP4 players
The name MP4 is actually MP3 for playing video
This kind of playback The device is not actually MP4, it is essentially MP3, and video playback is just its accessory function. It is called MP4, which is purely commercial speculation. The limitations of this player are extremely small, the screen is small (0.8~1.8 inches), the flash memory capacity is small, it supports specific formats (MTV, MP4, MPV and DMV, etc.), and most of them use low-end screens such as OLED and CSTN. So to be precise, this can only be called MP3 that can play video. Representatives are: DEC F12R, Jinbang Colorful King, 3E E1000 and PISA Colorful Airship. Hard disk MP4
Simply put, it is a portable watch with hard disk as the medium. A big belly can accommodate the world, and with a hard drive, you no longer have to worry about running out of space. Generally speaking, the hard disk MP4 also integrates many other functions, such as digital cameras, video cameras, voice recorders, digital companions… However, this kind of mp4 is much more expensive than the mainstream flash memory MP4, usually it is not necessary to consider it if there is no 1000.
Smart mp4
With the popularization of smart phones and tablet computers, at the end of 2010, an MP4 with Android operating system appeared on the market called “Smart MP4”. Smart MP4 is a product between traditional MP4 and tablet computer. It not only has the audio and video playback function of traditional MP4, but also can get more software because it is equipped with Android. Smart MP4 can be regarded as a product after the fusion of traditional MP4 and MID, but the function is not as good as the two of them. Because the frequency of the main control chip of MP4 is low, it cannot access the Internet and is not as good as MID, and the audio and video playback and decoding capabilities are inferior to that of traditional MP4. But sandwiched between traditional MP4 and MID, the price of smart MP4 is generally not high in order to improve the competitiveness, so it is a good choice for consumers who want to “try the early adopters”.
MP4 without display
Some manufacturers think that the 3.5-inch screen of MP4 is too small to play high-quality video, and that for flash-based MP4 The 128MB~16GB of the HDD is also difficult to appreciate the blockbuster, so these manufacturers have designed a hard disk MP4 without a screen. This MP4 can be output to a screen such as a TV through AV-OUT, color difference components or even HDMI and other output methods. It is a 1.8~2.5-inch micro-hard drive, which is relatively large in size, but for this kind of MP4 that does not emphasize mobility, it is much smaller in size than a traditional DVD player. There are already many on the market. There are dozens or hundreds of gigabytes of capacity, but the price is more expensive than flash-based MP4. For example, Archos MP4.
Three standards for identifying high-definition MP4
With the development of the MP4 market, the requirements of the consumer group are getting higher and higher, and the high-definition standard of MP4 The question is always the one with the highest voice. Does the bigger the screen, the clearer it is? Here I discuss with you the high-definition standard in the MP4 world.
In the past, the MP4 playback format was limited, and we always needed to work hard to convert the format. Later, MP4 solved the problem of compatible formats, and RM live broadcast products became the most popular focus for a while. After the simple playback is realized, the clear and unclear problem has become the most concerned part, so high-definition MP4 is quietly born, and people’s requirements and standards for it are also constantly improving.
Initially, we thought these products needed to have a high-definition screen to be called high-definition MP4. At that time, the video player with a resolution of 800*480 pixels was the most concerned product, and it was natural to classify it into the ranks of high-definition MP4. It’s just that the problem has arisen over time: being able to display does not mean that it can be played, and the lack of processing power makes these high-definition screens meaningless.
After that, people redefined the high-definition MP4: in addition to having high-definition output capability, it must also have high-definition decoding capability. Judging from the current situation, the high-definition decoding ability is mainly manifested in three aspects:
First, the high-definition MP4 must be compatible with 720P video files such as RMVB and AVI at least .
The reason for specifying that high-definition MP4 must support 720PRMVB is for the current situation of domestic online video development. RMVB is small in size and excellent in picture quality. It is the most widely resourced video format on the Internet. HD MP4 does not support RMVB, which is the most basic meaning. Most of these RMVB film sources are suppressed as 720PRMVB, whose display quality is much higher than 720*480 resolution, but the capacity is much lower than 1080P source files, and are published on the Internet, so compatibility with 720P files is logically a necessary condition for high-definition MP4.
Second, HD MP4 needs to support 720P video format with a bit rate of 10Mb or more.
Simply put, in order to perfectly present the popular scenes of 720P resolution videos, at least 10Mb bit rate sampling is required to ensure that the quality is not lost. Only high bit rate MP4 can restore thrilling and intense scenes without losing any details including static pictures and intense scenes.
Third, when playing video in high-definition MP4, there must be no color blocks.
High bit rate does not mean perfect picture quality. Other technologies are needed to further improve the output performance of the product, and the first thing to solve is the color block problem. In complex scenes or scenes with strong contrast between light and dark, if the color blocks follow the shadows, the details of the picture will be lost, which greatly reduces the pleasure of viewing. Therefore, reducing the color block phenomenon to zero is another requirement for high-definition MP4.
