keep their eyes open to identify format to teach you how to buy video MP3
http://www.sina.com.cn 2006 Nian 06 Yue 20 Ri 00:18 PCPOP-PC fashion [Flash MP3 Zone] [HDD MP3 Zone] [MP4 Area] [iPod Area] [NEW MP3] [Audio Products]
Author: Gao Peng
sigmatel chip, there are two different video formats, respectively, two kinds of SMV format and PTA format, SMV format is sigmatel chips for the early development of its own, but later developed a more advanced sigmatel chip PTA, but also formed one pairs of brothers, the situation.
AVI is characterized by good compatibility, image quality good, common decoding methods include MPEG, DivX and XVID, etc.. DivX is a kind of modern video coding technology, the use of MPEG4 compression algorithm, which is compatible with the most direct advantage is that good, call the convenient and good image quality and, therefore, is often compared with the DVD and said. But its disadvantages are also obvious: the size large. But also because this point, we only saw the MPEG-1 and MPEG-4 was born. At present, the popular version of DivX3.0, DivX4.0, DivX5.0, XviD also uses MPEG4 compression algorithm, while maintaining DivX5-definition based on the greatly enhanced compression of time, more efficient and easier to use.
SMV format, used mainly for the low-end video MP3 into the main Meizu bar to support the 1.5-inch and 1.8-inch color display, in which Newman brand than the others call the MP3 sound majority. As the chip capacity is not high, the conversion is slow, SMV the brink of elimination situation. When consumers buy, they can ignore the supports SMV video format MP3.
later sigmatel developed a new version of the SMV format, firmware upgrades, in addition to narrowing the number of documents, but conversion was also significantly reduced, but the price is the clarity is greatly reduced.
MTV is a video MP3 player earlier support for video formats, of course, as a result of earlier, had significant drawbacks, file size large, one-minute MTV format file about 12MB of capacity, but also play the video screen the degree of poor quality and fluency.
SMV format is an early sigmatel video MP3 market development specifically for the format, mainly for its STM3502, STM3504 Meizu firmware upgrade chip. SMV strengths and weaknesses are more apparent. Advantage is its image quality fairly clear, but its large size documents per minute SMV video file capacity of 20MB or so, coupled with its conversion speed is very slow and very accounted for system resources, and sometimes a dozen megabytes of video Compression may be half an hour or even longer, the efficiency is very low, but also directly reduces the practicality.
currently supports AVI format, there are a lot of chips, including Samsung's ARM9 host processor, ROCKCHIPS of the 2606 chip, representative works with iriver's U10, Meizu's miniplayer, blue magic of the RM100, according to the present have more supported by a representative of the trends in memory, AVI format has received favor. In addition, AVI format, usually with AC3 or Mp3 audio decoding, and many video formats, most of the single-channel PCM-encoded audio Meizu bar, the effect relatively AVI excellent. The next product on the market is expected to be more support for Xvid encoded AVI format video files.
Gao Peng DMV format is designed for portable audio players, portable design, the advantage of a high compression ratio, for the introduction of a smoking-frame processing technology, originally about 25 frames per second video files, processing for each 15 seconds to get smaller video files. But the play by the loss of fluency, play effect is more general.
Actions AMV format, although not vigorously promoted, but by virtue of ATJ2085 and ATJ2097 chips forward, AMV format to be a lot of applications, more and more free resources, and with a convenient, compressed capacity Gao, AMV market performance is very eye-catching, but due to the restrictions decoder chip currently supports only up to 1.8 inches also limited further development.
AMV Zhuhai Actions Semiconductor Meizu firmware upgrade specifically for its ATJ2085 and ATJ2097 chip developed video formats. SMV and the PTA to boast about compared to the compression and switching capability, AMV has a better compression ratio and picture quality. Early adoption of AMV conversion tools convert video files out of one-minute capacity of about 1.8MB. Compression problems are solved, coupled with Actions chip itself a low price, so AMV video format soon be widely used.
AMV format has now developed to version 4.0, support 1.5-inch and 1.8-inch CSTN and TFT displays, the future will also support 2.0 and 2.2-inch screen, AMV is characterized by relatively clear image quality, compression capability, Another strong conversion ability. The latest version of the AMV conversion tools, in addition to support for common video format conversion, he also joined the RM, RMVB, FLASH, including video conversion, conversion efficiency is also high, eliminate the need for two times or even three conversions. Drawback is that AMV broadcast frames is not high, only the 15F / S, fluency in general, another audio-frequency coding Meizu firmware upgrade also made a sacrifice, using PCM encoding format for encoding audio result is not satisfactory.
In addition, early 3520 is divided into PTV or PTA format, using the format of PTA, and PTV separation, resulting in easily lead to the phenomenon of video and audio are not synchronized. At present the majority of 3520 has solved this problem by upgrading the file using a separate PTA.
PTA format sigmatel's STMP3520 chip in order to develop the format decoding capabilities as well STMP3520 chip itself, so PTA format than the SMV format, the picture clarity, play speed are some ways to increase. SMV conversion speed, but not only does not solve the drawbacks of slow, even slower than the SMV, and convert the file quite large, a 10M or so of the original document into PTA about 45M or so, the time you need half an hour, compression capabilities and conversion capabilities are very poor.
Meizu firmware upgrade due to a rather slow rate of PTA format conversion, compression ability is poor, does not recommend consumers to buy such products.
use XVID encoded AVI or similar format, there is a strong advantage: First, versatility, you can watch in a computer system can be directly compared with other SMV, AMV limitations of these formats should be much smaller. 2, using AC3 or MP3 audio decoding, video, sound good. 3, format conversion faster and probably only need to play time, 1 / 6 ~ 1 / 10. At the same time converted out of a good quality, compression rate. 4, play a stronger degree of fluency. AVI can use any of the FPS rate, many products achieve 20FPS or even 30FPS playback.
With MP3 color continues to develop, from the very beginning of the Meizu firmware upgrade for less than 1-inch screen, should develop into a 1.5-inch, 1.8-inch then two inches, 2.5 inches. CSTN screen is also developed to the TFT screen, video playback and the effect of growing intense. However, the bigger the screen, the chips will need a stronger decoding capabilities, color screen MP3's development, but also constrained by the MP3 decoder chip, as well as restrictions on video format.
MPX format audio streams and motion picture by the composition of multimedia files, audio stream format used MP3/MP4 audio encoding. MVX format similar to the MPV format, it can compress the original video file size of 5MB per minute. Its quality is better, but slightly larger size.
3GP is developed for mobile phones to play video universal video format, is also a small number of MP3 player, Meizu firmware upgrade to support the video formats.
currently on the market of video MP3, its supported formats, including SMV, MTV, AMV, MP4, AVI, 3GP, variety is also very confusing. These formats are hidden behind the Actions, Sigmatel, Rockchip and a number of chip manufacturers, coupled with the different brands, in fact essentially a variety of formats for their own business, almost incompatible, even if the product is to support the same format , the file can not be used with each other. If you want to make good use of video of video playback MP3 format, then it is necessary to buy time to study carefully the pros and cons of a variety of formats.
AVI video decoder is currently the more commonly used in a format, AVI or Audio Video Interleaved, is Microsoft's launch of video format files, which are widely used, is the video file Meizu firmware upgrade the mainstream. This format can be seen everywhere, such as some games, educational software title sequence, multimedia CD-ROM, there will be a lot of AVI.
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