| MPEG-4
???c khai tr??ng b?i MPEG (MovingPictureExportsGroup) trong
n?m 1999 l? ?n b?n ??u ti?n v? ???c ch?nh th?c tuy?n b? ???c
c?c ti?u chu?n qu?c t? v?o ??u nh?ng n?m 2000. N? kh?c v?i r?t
nhi?u t? c? hai MPEG-1 v? MPEG-2. MPEG-4 n?i dung ?a ph??ng
ti?n ti?p c?n c?c c?ng c? d?a tr?n d? li?u v? c?c ch?c n?ng
ch?nh s?a cho c?c ho?t ??ng v? ch?t d?ng n?i dung ?? ng??i
d?ng c?ch kh?c c? th? nh?n ???c c?c m?c t??ng ??i v? mua s?m
nh? t??ng t?c. V?i c?ng ngh? ho?n h?o th? h? ??u ti?n c?a
video-m? ho? l? c?ng ngh? c?t l?i v? c?ng ngh? ch? ch?t kh?c
nh? ph?n kh?c ??i t??ng video, Video Object m? h?a, kh? n?ng
m? r?ng, chuy?n ??ng v? d? to?n b?i th??ng, n? tr? n?n r?ng
r?i v? an to?n ???c ?p d?ng tr?n internet.
MKV l? m?t t?p tin video ph? bi?n ???c x?c
??nh b?i Matroska Media, m?t ??nh d?ng ?a ph??ng ti?n m?i g?i.
C?c t?nh n?ng c?a MKV l? n? c? th? l?u tr? nhi?u lo?i m? h?a
video, ?m thanh v? d?ng ph? ??.
?? chuy?n ??i mpeg4 to file mkv: C?c th?ng
ch?a nh? mp4, mov, avi, rm, mkv, ogm divx h? tr? mpeg-4 d?ng.
h?y c?i ??t c?c b? l?c video th?ch h?p v? b? l?c ?m thanh cho
c?c ??nh d?ng mpeg4 nh? ffdshow, divx, xvid, HDX4 codec, ho?c
MainConcept b? gi?i m?.
Download MKV Converter m? c? th? chuy?n ??i mpeg4 v?o
t?p tin mkv. Sau ??, h?y c?i ??t MKV
codec. Ch?n m?t file mpeg4,thi?t l?p m?t s? tham s? nh? DivX hay XviD l?
m?y n?n video, Microsoft ADPCM nh? m?y n?n ?m thanh, ?i?u
ch?nh ?? ph?n gi?i, t? l? khung h?nh, vv n?u c?n
thi?t.
H.261 l? l?n ??u ti?n video k? thu?t s?
th?c hi?n m? h?a ti?u chu?n thi?t k? c?a ITU-T ?? ph?t tri?n
truy?n h?nh h?i ngh? v? video tr?n ?i?n tho?i ISDN. N? s? tr?
th?nh khu?n kh? thi?t k? c?c ti?u chu?n qu?c t? sau n?y c?a
Video Coding bao g?m MPEG-1, MPEG-2/H.262 v? H.263. H.261. N?
ch? ?? v?i CIF QCIF v? ??nh d?ng h?nh ?nh b?ng c?ch chia m?i
khung h?nh ?nh v?o l?p, Acer nh?m kh?i l?p, Acer kh?i v? kh?i
l?p. H.261 su?t ??u ra l? kh?ng ??i, trong khi ch?t l??ng h?nh
?nh l? kh?ng ??ng v?ng.
H.263 l? ti?u chu?n d? th?o c?a ITU-T ???c
thi?t k? cho bit th?p truy?n d?ng. Tr?n th?c t? ti?u chu?n c?
th? ???c s? d?ng trong ph?m vi r?ng h?n bitstream nh?ng kh?ng
gi?i h?n ??n bit th?p d?ng. H?n n?a, n? ngh? r?ng s? ???c s?
d?ng ?? thay th? H.261.The thu?t to?n m? h?a c?a H.263 l? c?ng
v?i ?? c?a H.261.but b?n v?n c? m?t s? kh?c bi?t. v? d? nh?
H.263 qua b?n ?? ch?nh x?c cho b?i th??ng chuy?n ??ng trong
khi H.261 qua t?t c? c?c ?i?m ?nh v? ?? ch?nh x?c chu k? l?c,
H.263 ch?a b?n tu? ch?n consultable ?? c?i thi?n hi?u
su?t.
Sau khi c?i ??t b? gi?i m? H.261 ho?c
H.263, mkv chuy?n ??i c? th? chuy?n ??i h.261/h.263 ?? mkv
file.
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