MP4 file format
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From: Steven Lv on 24 Nov 2009 06:33 By MP4 Converter | Last updated 11/10/2009 07:58:06 PM MP4 Audio Format: AAC Was originally an audio format MP4, and MPEG-4 there is no significant relationship, just as MP3 and MPEG-3 has nothing to do the same. MP3 is MPEG-1 Audio Layer 3 of the abbreviation; while MP4 is the MPEG-2 AAC, because it is completely an audio compression format, an increase of such a perfect reproduction of the stereo, multimedia control, noise reduction and other new features, the most important Shi, MP4 through special digital copyright protection technology, which is unmatched by MP3. Video MP4 format: MPEG-4 The majority of the market is now biased in favor of MP4 multimedia player that can play AAC, and it can be said scarcer. And even the media MP4 said to be MPEG4 acronym, which in the past appears to be a fallacy, but after continued speculation business, this fallacy has become the truth. Now, if you go to Computer City to hear the word MP4 definitely be able to play video format the concept of a multimedia player, and not be able to play the MP4 AAC audio player. This strange phenomenon occurs not without reason, as already mentioned, AAC copyright protection function, which is a number of record company support the AAC cause, to make your own player supports AAC, have to pay a copyright fee to support or patent fee, and, AAC is also the source of the problem, unlike MP3 less open, on-line source rare, we now have audio MP4 player development can not be, in view of the status quo, public businesses simply \"reincarnated\" to MP4 equivalent to MPEG-4 abbreviated terms, this also happens to be the next generation of MP4 is the MP3 of this law, in addition to support for MP3 music playback capabilities possessed, but also has a powerful MPEG-4 video playback capabilities, In addition, just \"4\" in the \"3 \"post, from this point of view, the MP4 equivalent MPEG-4 is reasonable. MPEG-4 encoding and format of MP4 Player supported encoding formats can be called \"the disorder of chaos\", in addition to PMC, because of the hardware platform is no uniform standard, the software system is also designed by the manufacturer, which is caused by decoding MP4 player compatibility and decoding the stability of the root causes of uneven; In addition, by the MPEG-4 encoding system and seen generations come out a lot of formats, in addition to PMC beyond MP4, decoder compatibility and hardware-related, which has greatly increased the difficulty of decoding, video format, originally For example, the multi-AVI, ASF, MPG, WMV, coupled with multi-coding algorithm: MPEG-1, MPEG-2, MPEG-4, but most of MP4 player supports MPEG-4 encoding, there are a variety of derivative coding algorithm: DivX, XviD, H.263, MS MPEG-4 3688, Microsoft Video1, Microsoft RLE.
From: Poutnik on 24 Nov 2009 11:08 In article <58a1cf66-ab34-40ad-b376-ccc7a361c4c3 @h10g2000vbm.googlegroups.com>, steven.lv.2005(a)gmail.com says... > Quoted from http://forum.doom9.org/showthread.php?t=96059 videoformats XviD, DivX are imp-lemetation of MPEG-4 ASP resp. MPEG-4 Part 2 videoformat H264 or often called just MPEG-4 is MPEG-4 AVC or MPEG-4 Part 10 MP4 as file format or more exactly multimedia container specification is MPEG-4 Part 14. audio in AAC format is MPEG-4 Part 3 -- Poutnik The best depends on how the best is defined.
From: Franklin on 27 Nov 2009 07:59
Yrrah wrote: > Steven Lv <steven.lv.2005(a)gmail.com>: > >> Was originally an audio format MP4 > > http://en.wikipedia.org/wiki/Mp4 > > But your point is? > > Yrrah His text is from LBQ Video Converter: http://www.lbqvideo.com/MP4-file-format.htm |