-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Huan Truong wrote: > 2008/4/16 Nguyen Vu Hung <vuhung16plus+shape at gmail.com>: >> 2008/4/12 Minh Ngoc Le <cumeo89 at gmail.com>: >> > Th?c s? em ko hi?u l?m v? kh?i ni?m ??nh d?ng "??ng". Ng??i s? d?ng s? g?p >> > kh? kh?n g? khi d?ng ??nh d?ng "??ng"? Lu?n c? th? t?y th?ch chuy?n ??i >> ??nh >> > d?ng t? "??ng" sang m? n?n th?c ra nh?ng ??nh d?ng ?? c?ng ko "??ng" l?m >> m? >> > ph?i ko? >> > >> Vi?c n?y h?i ch?nh tr?. >> >> ??ng: Kh?ng ho?n to?n ???c l?m ch?. B? ph? thu?c. >> M?: ???c l?m ch?. > > V?i OOXML (DOCX) th? c?ng s? nh? PDF, MPEG > Th?c ra OOXML kh?ng ph?i l? ??nh d?ng ??ng. :-| > > C? th? h?nh dung nh? n?y cho ??n gi?n: > > DOC c?ng nh? MP3 - _de factor_ - kh?ng free nh?ng tr??c th? ai c?ng d?ng ;-)
V?n ?? c?a DOC v? MP3 th?c ra ho?n to?n kh?c nhau v? b?n ch?t. DOC l? ??nh d?ng ??ng ho?n to?n, ngh?a l? MS ki?m so?t 100% nh?ng ai c? th? truy c?p t?i li?u ??c t? k? thu?t c?a ??nh d?ng n?y. Ng??c l?i ??nh d?ng MP3 l? chu?n ?? ???c c?ng nh?n c?a ISO/IEC (m? 100%), ngh?a l? ??c t? c?a ??nh d?ng n?y l? ph? bi?n cho b?t k? ai mu?n c?. V?n ?? v?i MP3 l? nhi?u thu?t to?n c?n thi?t ?? th?c hi?n encode v? decode ???c s? h?u b?i patent c?a nhi?u c?ng ty v? t? ch?c kh?c nhau. C?c c?ng ty n?y th??ng ??i royalty t? b?t k? ai ph?n ph?i ph?n m?m c? kh? n?ng decode v? encode mp3 (b?t k? ph?n m?m ?? ???c ai vi?t ra), d?n ??n ki?n t?ng t?m lum. > ODF c?ng nh? OGG - m? nh?ng kh?ng c? l? do g? th?t thuy?t ph?c ?? > switch v? kh?ng ph?i ai c?ng m? ???c > OOXML DOCX c?ng nh? MP4 - chu?n ISO > > D?o n?y t?i rip v? mua nh?c c?a m?nh ? ??nh d?ng mp4 - n?i chung kh?ng > c? g? nhi?u ph?i ph?n n?n. MP4 l? MPEG-4 Part 14. V?n ?? c?a n? c?ng kh?ng kh?c g? so v?i MP3. Vi?c implement v? ph?n ph?i c?c ph?n m?m encode v? decode c?c ??nh d?ng n?y ???c m? t? nh? ?i tr?n b?i m?n, b?c kh?ng th? bi?t b?c s? b? ki?n v? vi ph?m patent v?o l?c n?o. V? v?y t?t nh?t l? thu? tr??c th?t nhi?u lu?t s? ho?c sang vi?t nam l?m ?n :)) ho?c ch? cung c?p c?c codecs kh?ng b? covered b?i patent nh?: Theora (video), Vorbis (music), Speex (voice), FLAC (lossless Audio). B?c c? th? gi?p nh? cung c?p free software b?ng c?ch s? d?ng ch?ng, l?m cho ch?ng tr? n?n th?ng d?ng. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFIB14esQKAZYrNOIIRAlnxAJ9dDYpRT1mlarCKq8rKNz7WUglEeQCg4w/y vGdiBaq/4uJXe3M00TjNvTk= =LWYR -----END PGP SIGNATURE-----
