| QT l? ph?n
m? r?ng c?a t?p tin ??nh d?ng ph??ng ti?n truy?n th?ng c?a
Apple QuickTime. QT ch?c n?ng nh? m?t t?p tin ?a ph??ng ti?n
container c? ch?a m?t hay nhi?u b?i nh?c, m?i c?a h?ng m?t
lo?i d? li?u: video ?m thanh,, hi?u ?ng, v?n b?n, ho?c ph?
??.
WMV t?p tin ch?a c?c d?ng video v? audio
t??ng ?ng b?ng c?ch s? d?ng Windows Media Video codec v?
Windows Media Audio codec.
?? chuy?n ??i QT ?? wmv file, h?y c?i ??t
QuickTime Player v? QuickTime l?c DirectShow.
Download WMV Converter m? c? th? chuy?n ??i qt v?o
t?p tin wmv. Ch?n m?t qt t?p tin, thay ??i m?t v?i tham s? nh?
m? h?a video bitrate,bitrate m? h?a ?m thanh, ?? ph?n gi?i, t?
l? khung h?nh, vv n?u c?n thi?t.
N?u thi?t l?p t?y ch?nh k?ch
th??c ?? xem ?? n?t cao trong 1280x720 (720p) ho?c 1920x1080
(1080p) ngh? quy?t, v? t?ng t? l? bit, b?n c? th? chuy?n ??i
qt ?? wmv HD.
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, wmv chuy?n ??i c? th? chuy?n ??i ?? h.261/h.263 wmv
file.
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