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Thread: Knowledge about MP4 |
    
New member Username: Jywong
Post Number: 2
Registered: Aug-06
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| Posted on Wednesday, August 23, 2006 - 02:50 am: |
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New technology is always flooding in our life. Along with the increasing need, mere audio playing can¡¦t satisfy people need now. So there is a time of MP4. Maybe the knowledge of MP4 is rest on the concept of ¡§Video Playing¡¨. Well then, let me give you a more profound cognition today.
1. MPEG Standard
MPEG is the short of ¡§Moving Picture Exports Group¡¨. It come into existence in 1988 by ISO (International Standard Organization) associated with IEC (International Electronic Committee). It¡¦s a expertise group which constitute compress standard of digital audio/video.
2. MPEG-4 Standard
Let¡¦s see the MPEG-1, MPEG-2 standard which is more familiar to us firstly.
MPEG-1 is constituted in 1992 which is designed for the industry distinction. MEPG-1 aim at the compress of picture which has the CIF standard size ( NTSC is 352¡Ñ240; PAL is 352¡Ñ288), and also prescribe the biggest after-compress bit rate is 1.5Mbps. MPEG-1 achieve the storage in the different bandwidth device, such as CD-ROM, Video-CD, and also achieve the transmission of audio information in the internet.
MPEG released MPEG-2 in 1994, to make the mutual manipulation between video/audio service and application possible. MPEG-2 is the detail prescription which contrapose the compress precept of standard digital TV and high definition TV. The Video Codec is 3MB to 100MB per second. MPEG-2 is not a simply upgrade of MPEG-1. It give a more detail and perfect prescription in the system and transmission aspect. MPEG-2 is especially suit for the coding and transmission of broadcast-grade digital TV, and be considered as the coding standard of SDTV and HDTV.
MP4 is the short of MPEG-4, and MPEG-4 is a video format. Portable media player is called MP4 player because it support the playing of MPEG-4 format files.
The first edition of MPEG-4 is released in Feb, 1999, then the second edition at the end of the year, and finally come to the international standard at the beginning of 2000.
MPEG-4 is much different from MPEG-1 and MPEG-2. It¡¦s not a idiographic compress arithmetic merely. This international standard was constituted to meet the request of integrate and compress technology for digital TV, mutual plot application, mutual multimedia, and so on. MPEG-4 integrate numerous multimedia application into a integrated frame, to supply standard arithmetic and tool for the multimedia communication and application circumstance, and to establish a uniform data format which can be adopt prevalently by the application field, such as multimedia transmission, storage, search, and so on.
3. MP4 format converter tool
When we have a MP4 player, the following problem is how to convert the numerous video files format such as WMV, WAV, WMA, etc, for Microsoft, and RM, RMVB, RA, etc, for REAL, to the format which can be supported by our MP4 players. I¡¦ve done a search in the internet, and found that ¡§Super Converter¡¨ is a frequently recommended tool. This tool has a powerful function that can support the converter of many format, including MP4 format. While, another tool which attract me is ¡§ImToo MPEG Encoder¡¨. It include 3GP, PSP, ipod video converter, so that it can match much more popular devices.
Hereinbefore is some knowledge about MP4. It¡¦s not comprehensive. I just hope when you have a MP4 player, you can know more about it, and exert it more effectiveƒº |
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Bronze Member Username: Kevintsa
Post Number: 22
Registered: Jun-06
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| Posted on Thursday, September 28, 2006 - 12:49 pm: |
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i have used imtoo MPEG Encoder,It's interface is plain, but you can feel the expert. |
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