NN DVD THNH FILE .MKV/.AVI/.MP4(XviD Video + Multiple AAC 5.1/MP3 2.0 Audio Tracks + Multilingual Subtitles)

Gii thiuHng dn ny gip bn chuyn mt a DVD phim thnh mt file phim (.MKV, .AVI hoc .MP4), trong :

S dng DGMPGDec, AVISynth v VirtualDub t cht lng tt nht v thc hin nhng hiu ng video n tng nht.

Cho php nhiu track m thanh. VD: lm phim a ngn ng cho ngi xem t chn. Lm ph a ngn ng cho ngi xem t chn. Cch lm c nh gi l c cht lng tt nht, kh nng tu bin cao nht, nn nhanh nht, c tha nhn trn tt c cc trang web chuyn v x l video.

Bn c th chuyn mt a DVD thnh mt file .MKV/.AVI/hoc .MP4 vi kch thc nh hn rt nhiu nhng cht lng rt tt khng khc g a gc, li duy tr c tt c cc c im ca a DVD nh: m thanh a ng, Ph a ng, Chapters, ... Trong bi ny ti khng s dng cc chng trnh RIP DVD trn gi (ch cn cho DVD vo v "Click to rip"). S c rt nhiu th phi t bng tay, vt v hn rt nhiu nhng b li, chng ta hc c cng rt nhiu th v quan trng hn l t l cht lng/kch thc khng c chng trnh RIP trn gi no hn c. Khi RIP DVD, c hai khi nim bn cn phn bit: Container v Codec:

Container l khun dng lu tr, c th l dng file .AVI, .MP4,

.MKV, .MOV, .RMV, 3GP, OGM... Vic chuyn t dng container yu hn sang dng container mnh hn l rt nhanh v khng lm thay i cht lng video. Tuy nhin nu chuyn t dng container mnh hn sang dng container yu hn th c th s b mt cht lng do phi qua chuyn i, hn na mt vi thng tin ph tr: Chapters, DAR, PAR... cng c th b mt do dng container yu khng h tr.

Codec l khun dng m ho/nn d liu bn trong container: Cho video th l XviD/DivX/x264/VP7... codec, cho Audio c th l

c

MP3/AC3/AAC/OGG... codec. Vic chuyn t codec ny sang codec khc rt chm v cc lossy encoders k trn s lm mt mt s thng tin ca video gc trong qu trnh chuyn i. Ba dng Containers: .AVI, .MP4 v .MKV s c nhc n trong hng dn ny. Vic nn DVD thnh file dng .AVI, .MP4 hay .MKV v c bn l ging nhau, ch khc bc cui cng l ng gi cc thnh phn video + audio + subtitles vo container m thi. Matroska (.MKV) l dng container mnh nht, bn c th a tt c cc loi video/audio codecs vo file .MKV, nn dng container ny s c ly "lm mu" trc, sau s hng dn cc bn ng gi li thnh file .MP4 hay .AVI ch bng mt vi thao tc n gin v nhanh.

.AVI (Audio Video Interleave) l dng container c pht trin bi Microsoft t 1992 v hin nay b coi l kh lc hu v nhng hn ch trong khun dng lu tr. AVI container gp kh nhiu vn rc ri vi cc codecs mi nh H264, AAC, OGG: C nhng k thut a nhng dng audio/video ny vo file .AVI nhng phn ln cc cch da trn k thut hacking. Mc d vy, bt chp nhng gii hn trong khun

dng lu tr cng nh s xut hin ca nhng dng container tin tin hn (MP4, Ogg, Matroska...), AVI vn gi c s ph bin trong cng ng chia s files, bi tnh tng thch cao vi nhng chng trnh bin tp v xem phim nh VirtualDub, Windows Media Player... Vo nm 2005, DivX Inc. a ra mt dng container mi gi l DivX Media Format (.divx) nm a thm vo dng AVI nhng nh ngha v chapters, menu, subtitles ... Nhng nh dng ny hin khng c ch lm trong cng ng chia s files - ni m chnh DivX codec tr nn ph bin.

.MP4 (MPEG 4) l dng container c pht trin bi MPEG (Moving Picture Experts Group), y l dng container kh mnh, c th dng cha mi loi video/audio codecs tng thch vi chun MPEG: DivX, XviD, MPG, MP2, MP3, AAC..., Nhc im chnh ca dng container ny l: Khng h tr Display Aspect Ratio - DAR (Bn phi thay i khch thc khung hnh cho khp vi DAR), v ch chp nhn cc codecs tng thch MPEG. (V d m thanh AC3 s khng c chp nhn)

.MKV cn c gi l Matroska l dng container mnh nht (mnh hn nhiu so vi .AVI, .MP4, .OGM...). Matroska c th cha tt c cc thng tin c trn DVD. V vy chuyn i t cc dng .AVI hay .MP4 (yu hn) sang .MKV (mnh hn) rt nhanh m khng h b suy gim cht lng (lossless) v qu trnh chuyn i ch l "bnh mi, ru c". y l sn phm ca d n m ngun m Matroska (ly tn mt loi bp b g ni ting ca Nga). D n c bt u t nm 2002, vi mc ch: (1) To ra mt dng container hin i, mm do, d m rng, c th chy trn mi h iu hnh, cho php xem trc tuyn qua internet, c th cha mi loi audio/video codecs, h tr y cc tnh nng chapters, menu, fast seeking...(2) Pht trin mt b cng c to v bin tp Matroska files, tt c u l m ngun m GPL. (3) Pht trin cc th vin lp trnh

nhng ngi pht trin phn mm c th a Matroska thnh mt nh dng c h tr trong sn phm ca mnh. (4) Lm vic vi nhng cng ty sn xut thit b a s h tr cho nh dng Matroska vo cc sn phm xem phim/nghe nhc. V Matroska "qu mnh" nn vic chuyn i t Matroska ngc li thnh dng .AVI hay .MP4 l rt kh bo ton v khng th a ra mt gii php chung cho tt c cc trng hp. L do ny khin cho Matroska tuy vt tri hn hn so vi cc dng containers khc khi xem trn my tnh th li c tnh tng thch km hn so vi .AVI hay .MP4 nu nh bn mun ghi ra HD/DVD xem trn TV: Bn s cn mt u c a kh tin tin mi xem c. Gi cn bng gia Functionality v Compatibility l mt vic kh. V vy tuy hng dn ny dng .MKV lm "mu" nhng s khng ch trng nhiu ti nhng chc nng "c o" ca Matroska, m c gng tm cch nn vi tng thch hon ton vi dng .AVI hoc .MP4 bn c th chuyn ngc t file .MKV sang dng .AVI (vi m thanh MP3 Stereo) hay dng .MP4 (vi m thanh AAC 5.1 Surround) c th xem trn cc u c a + TV m khng b mt i mt cht cht lng no c "Trm hay khng bng tay quen", nu bn l ngi "k tnh" v cht lng, khng chp nhn nhng th thiu hon ho, phim ch hi xu mt cht l kh chu th xin mi ly mt a DVD ra v t t lm th tng bc lun theo hng dn di y. Cn khng nn c ht t u n cui ri mi lm th, v bn c th khng nh ht c, n lc lm tht s phi c li, lng ph thi gian ca bn. V hng dn ny gip bn nn c Video, Audio v Subtitles, do bn nn chn mt a c nhiu tracks m thanh v nhiu Subtitles (a ngn ng chng hn) th.

Bn c th cho rng...

Nn DVD xung th cht lng s gim?Sai hon ton, xu hay p tu theo cch ca bn nn (bitrate, k thut chng qut mnh, lm trn...) ch khng phi do b nn audio/video. Nu bn x l video tt, bn ripped cn p hn (Bn nhn thy Photoshop x l nh nh th no ri ch). V d bn c th xem trong k thut chng qut mnh: Cc h thng DVD Player thng dng Bob Filter chng qut mnh v b lc ny thc hin nhanh, d lp trnh thi gian thc, tuy nhin mi khung hnh s b mt mt na phn gii. Chng ta thc hin Adaptive Deinterlacing, b lc ny chm hn nhng li cho ton b phn gii ti nhng ni hnh tnh.

Cch ny phc tp qu! Cn cch no nn DVD thnh XviD n gin hn khng?C, m c rt nhiu, nhng cht lng v chc nng khng th bng c Cch n gin hn mt cht, l bn s dng GordianKnot Rippack v lm theo hng dn y. GK cng s dng cch tng t nh hng dn ca ti nhng u im hn l cc phn mm c ng thnh mt gi v quy trnh c thc hin di dng Wizards, mt s bc c t ng ho. Nhc im l mt s phn mm trong GK qu c hoc khng cn pht trin na, mt s th GK yu cu ngi dng phi t tm (do phn mm c thng mi ho). n gin hn cht na l bn s dng AutoGK v theo hng dn y. Cc khu c t ng ho nhiu hn GK, nhng mt i mt s chc nng so vi GK. Cn n gin nht l bn s dng mt chng trnh trn gi, ch cn a a DVD vo, mt thao tc bm chut l thnh file .AVI, nh No1 DVD Ripper, DVDx, ... vi s chc nng hn hp hn nhiu nhng li d dng vi tt c mi ngi.

QUY TRNH NN DVDNgn gnNn ring cc phn hnh nh (video), m thanh (audio) v ph (subtitles), sau ng gi c ba phn ny vo mt container thnh sn phm cui cng: mt file .MKV, .MP4 hoc .AVI

Chi tit

Trc ht bn cn s dng phn mm DVDShrink copy DVD vo mt th mc trong a cng, th mc ny cha cc files .IFO v .VOB.

Cc files .VOB s c chuyn cho DGIndex gii m MPEG-2 v thc hin mt s thao tc tin x l. DGIndex cng s tch ring phn hnh nh (Video) v m thanh (Audio) ra phc v cho cc thao tc x l tip theo.

Phn hnh nh (video) s c chuyn cho AVISynth v VirtualDub x l v nn thnh file .AVI

Phn m thanh (audio) s c nn bng BeSweet + BeLight thnh file m thanh (.AC3, .MP3, .AAC, .OGG... tu chn)

Phn ph (subtitles) s c tch ra t file .IFO v cc files .VOB bng VobSub

Ba phn hnh nh (video), m thanh (audio) v ph (subtitles) s c ng gi li vo trong mt container, l sn phm cui cng. Cng c ng gi c th l MKVMerge_GUI ng

gi .MKV, YAMB ng gi MP4, hoc AVIMux_GUI nu mun ng gi .AVI (tu theo bn thch dng container no) Chng ta s ni k hn v cc tin trnh ny trong cc phn tip theo. Nhng trc ht bn hy chun b nhng phn mm cn c v ci t chng tht chnh xc theo ng hng dn.

NHNG CHNG TRNH CN CMt s chng trnh ti b sung thm nhng files cn thit cho hng dn ny trc khi lm b ci t. V vy bn nn download t links y, nu bn download t homepage ca cc chng trnh ny bn s phi t b sung nhng files

Chng trnh copy DVD vo HDD: DVDShrinkDownload DVDShrink Mt s DVD khng cho bn copy vo HDD nu khng c chng trnh decrypter v region free. C nhiu phn mm c th s dng cho mc ch ny nh DVD Decrypter, SmartRipper... Hin ti ti s dng DVDShink v y l chng trnh kh mnh, chy n nh v hon ton min ph. Cch ci t: Download v c file .EXE, chy file .EXE ci t

Bn cng c th s dng SmartRipper hoc DVDDecrypter cho mc ch ny.

Chng trnh m ho video: K-lite mega codec packDownload K-lite mega codec pack Cch ci t: Download v c file .EXE, chy file .EXE ci t, ti lc chng trnh hi Installation Profile th chn "Lots of stuff".

a s cc chng trnh RIP u rt nh, l do l chng trnh RIP ch thc hin vic c v x l frame, sau chuyn thng frame cho b m ho video nn v ghi file). V vy nu bn mun nn theo chun XviD, bn cn c XviD encoder, mun nn theo chun DivX, bn cn c DivX encoder... Nhng ci ny bn c th vo homepage ca XviD hoc DivX download v v ci

t. Tuy nhin vi nhng th pht trin nhanh nh 2 codecs ny, version mi nht thng cha rt nhiu li, v vy ti ngh cc bn ci t K-lite mega codec pack theo profile "Lots of stuff" c lun rt nhiu b encoders, bao gm c DivX v XviD, tuy version c th khng phi mi nht, nhng l nhng version chy n nh, tnh tng thch cao, c kim tra cn thn. (Nn thng xuyn vo y cp nht phin bn mi nht ca K-lite mega codec pack). K-lite mega codec pack cn bao gm c Media Player Classic l phn mm xem phim dng trong hng dn ny.

Chng trnh gii m MPEG-2: DGMPGDec (DgIndex)Download DGMPGDec. Cch ci t: Download v c file .EXE, chy file .EXE ny ci t. DGMPGDec l phin bn tin tin hn ca chng trnh DVD2AVI, trong hng dn ny DGMPGDec c dng nh mt Frame Server: Gii m cc file .VOB v cung cp cc frame cho AVISynth.

Chng trnh qun l khung hnh: AVISynth (Cn bn v2.5 hoc mi hn)Download AVISynth. Cch ci t: Download v c file .EXE, chy file .EXE ny ci t.

AVISynth l mt chng trnh x l Video cc mnh bng script vi v hn cc chc nng (v bn c th lp trnh x l video bng script ca AVISynth c). AVISynth c s dng trong hng dn ny to AVS Script cho VirtualDub.

Chng trnh x l v nn Video: VirtualDubDownload b ci t gm c VirtualDub, VirtualDubMod, VirtualDub Mpeg2, NanDub v Additional Filters. Cch ci t: Download v c file .EXE, chy file .EXE ny ci t. VirtualDub l mt phn mm m m rt ni ting vi kh nng x l video/audio chuyn nghip v dng trong hng dn ny. Cc phin bn khc ca VirtualDub nh VirtualDubMod, VirtualDub Mpeg2,... l dnh cho nhng cng vic khc khng lin quan.

Chng trnh chuyn i m thanh: BeSweet+BeLightDownload BeSweet+BeLight. y l chng trnh chuyn i m thanh gia cc dng AC3, OGG, MP3, AAC, MP2, WAV... Cch ci t: Download v c file .EXE, chy file .EXE ny ci t.

Chng trnh tch ph t DVD: VobSub

Download VobSub. y l chng trnh tch ph t file .IFO ca DVD Cch ci t: Download v c file .EXE, chy file .EXE ny ci t.

Chng trnh ng gi .MKV/.MP4/.AVI (Multiplexing): MKVToolsDownload MKVTools y l chng trnh bao gm MKVMerge GUI ng gi Video/Audio/Subtitles vo trong .MKV container, MKVExtractGUI tch cc thnh phn Video/Audio/Subtitles t file .MKV, AVIMux_GUI ng gi .AVI, YAMB ng gi .MP4. Cch ci t: Download v c file .EXE, chy file .EXE ny ci t.

COPY DVD VO HDDCh : Bn cn lm theo ng th t nh ch ra trong hng dn ny! a DVD vo v bt chng trnh DVDShrink ln. Bm vo chc nng Re-author (1), bn bng DVD Browser, bn chn a cha DVD (2). Khi ni dung DVD hin ra, trong phn Main Movie, bn cn copy title no vo HDD th dng phm chut tri bm vo title v ko th qua bn khung Re-authored DVD (3):

By gi bn bm qua bng Compression Settings (1), bm vo ch DVD bn th mc gc ca Re-authored DVD (2), chn No Compression cho Video (3) v nh du chn tt c cc Audio Tracks hin hu (4):

Chn No Compression l buc DVDShrink phi gi nguyn cht lng Video khng c nn (thc ra DVDShrink c lm ra vi mc ch chnh l nn DVD 9.4GB thnh DVD 4.7GB vi cht lng t hn mt cht). Bn hon ton c th khng nh du chn mt vi Audio Tracks nu cm thy khng cn thit (chng hn nh Karaoke Audio Track ch c nhc khng c li). Nhng ti thng ch nh DVDShrink copy tt, c dng hay khng tnh sau. :-).

By gi bn bm chc nng Backup (1), chn Backup target l Hard Disk Folder (2), chn th mc cha ni dung DVD mun copy ra (3), v bm OK (4). i vi pht cho qu trnh copy hon tt, bn xong bc th nht. Ch : Nu bn c bn copy ca DVD trn HDD nhng bn copy ny lm bng phn mm khc, bn vn nn re-author li theo cch ny v DVDShrink c kh nng chia li chnh xc cc titles v program chains, trong khi rt nhiu phn mm copy khc b li chia titles lm cho nhng cng on sau ny b li. Chia li titles bng DVDShrink ch l qu trnh hiu chnh, khng b mt cht lng v nhanh.

TRCH XUT M THANH V HNH NH BNG DGINDEXCu trc DVDHy nhn vo cc files trong th mc bn mi copy DVD vo, bn s thy mt DVD chia lm nhiu titles, mi titles c th c chia thnh title menu v cc chunks. Trong mi title c mt file .IFO i km vi cc file .VOB, tn files c t di dng VTS_##_%.* trong ## l m s title, % l m s chunk v phn m rng * l .IFO hoc .VOB. C th c nhiu files khc na nhng nhng files ny khng quan trng. V d mt DVD cha 4 titles: Title 1: VTS_01_0.IFO: VTS_01_0.VOB: VTS_01_1.VOB: VTS_01_2.VOB: VTS_01_3.VOB: VTS_01_4.VOB: VTS_01_5.VOB: 92,479,488 bytes (Title bytes bytes bytes bytes bytes 94,208 1, chunk (Title (Title (Title (Title (Title 1, 1, 1, 0 1, 1, Title 1 bytes Menu) 1) 2) 3) 4) 5)

1,073,455,104 1,073,518,592 1,073,588,224 1,073,391,616 1,073,422,336

chunk chunk chunk chunk chunk

VTS_01_6.VOB: 1,004,992,512 bytes (Title 1, chunk 6)

Title 2: VTS_02_0.IFO: VTS_02_0.VOB: VTS_02_1.VOB: 6,184,960 bytes Title 3: VTS_03_0.IFO: VTS_03_0.VOB: VTS_03_1.VOB: 315,011,072 bytes Title 4: VTS_04_0.IFO: VTS_04_0.VOB: VTS_04_1.VOB: 416,739,328 bytes Bn cn ch : V khun dng Video, Audio, Subtitles, Menu ca mi title thng khc nhau, khng nn chung c nn:

18,432 241,664

bytes bytes

24,576 8,192

bytes bytes

26,624 8,192

bytes bytes

Mi title ca DVD phi c nn ring bit. Nu khng s gp li. Trong mt title, phn menu cng phi c nn ring r vi cc phn khc. Nu khng s hng phn m thanh (nu nh th ting/hnh i lch, nng th hng hon ton knh Audio)

V d nu DVD c 4 titles, mi title u c menu, nu mun nn ton b, bn phi nn thnh 8 files ring bit.

Di y ti hng dn mt title khng c menu. Hy cc files .VOB trong title t chunk 1 tr i (Chunk 0 l Menu, nu mun nn bn phi nn ring). Nh v d trn, nu bn nn Title 1 th cn ch cc files .VOB sau: VTS_01_1.VOB: VTS_01_2.VOB: VTS_01_3.VOB: VTS_01_4.VOB: VTS_01_5.VOB: VTS_01_6.VOB: 1,004,992,512 1,073,588,224 1,073,391,616 1,073,422,336 1,073,455,104 1,073,518,592

To project trong DGIndexChy DGIndex.exe kch hot chng trnh. Bm F2 (menu File/Open) m files, vo th mc cha cc file .VOB va copy t DVD, chn cc files .VOB nh xc nh bc trc:

Kim tra li danh sch files, v bm OK:

t li cc thit lp sau:

Vo menu Video/Field Operation, chn vo ch Honor Pulldown Flags. Vo menu Video/YUV->RGB, chn vo ch TV Scale (Nu bn chn PC Scale s c phn gii mu tt hn mt cht trn mn hnh my tnh, nhng nu xem trn mn hnh TV s hi xu - Ci ny t hay khng tu theo bn mun xem sn phm cui mn hnh PC hay TV).

Vo menu Audio/Output Method, chn vo ch Demux All Tracks.

Bm F5 (File / Preview) xem th mt on, kin nhn ch 5-10 pht v c cc thng s DGMPGDec a ra trong ca s bn phi ca s chnh:

Nu xy ra mt trong ba trng hp sau, bn s PHI vo menu Video/Field Operation v nh du kim () vo ch Forced Film :

Trng hp 1: Video Type = FILM > 95% v FrameType = Progressive

Trng hp 2: Video Type = FILM > 95%, FrameType = Interlaced v KHNG c li qut mnh. kim tra li qut mnh bn ko thanh trt ca DGMPGDec qua mt vi khung hnh (frame) v nhn bng mt thng xem c hin tng "gai" do lch dng qut chn/l trn khung hnh hay khng?. V d nh sau l mt khung hnh b gai do li qut mnh:

Trng hp 3: Video Type = NTSC, Frame Type = Progressive Video Type Frame Type Li qut mnh Gii php Khng cn lm g c Khng cn lm g c Chng qut mnh bc sau vo menu Forced Film vo menu Forced Film Chng qut mnh bc sau vo menu Forced Film Khng cn lm g c Chng qut mnh bc sau

Progressive (Khng cn bit) PAL Interlaced Khng C

Progressive (Khng cn bit) FILM > 95% Interlaced Khng C

Progressive (Khng cn bit) NTSC Interlaced Khng C

Ti sao li phi phc tp nh vy? cu tr li nm hai yu t NHANH v P.

Chun DVD NTSC thng c ghi theo kiu qut mnh (interlaced), khi nim ny c th th no s c gii thch sau. Ch c iu cc chng trnh nn video thng khng lm vic tt nu video c ghi kiu qut mnh. Nu bn c nguyn nh vy v nn s c mt sn phm xu t hi. V vy nu video b hin tng qut mnh, chng ta phi kh hiu ng ny (Deinterlace) trc khi nn. Tuy nhin vic kh hiu ng qut mnh rt chm v khng hon ho. Do chng ta ch thc hin vic kh ny vi nhng video thc s l qut mnh (interlaced). Cn c rt nhiu phim lm gi hiu ng qut mnh khi chuyn t phim nha (Frame Rate = 23.976fps) sang DVD (29.97fps) bng k thut Telecine. Nu DGMPGDec pht hin phim thuc dng ny th khi chn Forced Film, on video s t ng chuyn v tc khung hnh ca phim nha (23.976) rt nhanh, hon ho, m khng cn hiu ng qut mnh na. Vic cui cng l bm F4 (File/Save Project) ghi project ny vo mt file .d2v, qu trnh ghi s mt vi pht v DGIndex s phi tch tt c cc tracks m thanh ra thnh file m thanh cha trong cng th mc vi file .d2v. Khi qu trnh ny kt thc, bn s c nhng files sau y trong th mc:

Mt file dng .d2v Mt s file m thanh trch xut t DVD, s lng cc file m thanh bng s audio tracks trong cc files .VOB.

V d: Tn file .d2v l MyVideo.d2v, cc file m thanh c th l "MyVideo T01 3_2ch 448Kbps DELAY -384ms.ac3" v "MyVideo T03 3_2ch 384Kbps DELAY 52ms.ac3" tng ng vi 2 track m thanh trn DVD.

X L VIDEO BNG AVISYNTH+VIRTUALDUBX l video bng AVISynthAVISynth Scripts l mt tp hp cc lnh x l video t trong mt file vn bn c ui .AVS. Cc khung hnh sau khi c DGIndex gii m s c chuyn cho AVISynth thc hin cc thao tc x l video v cui cng chuyn cho VirtualDub thc hin vic chnh l nn. Script ca AVISynth l cng c x l video cc mnh, nhc im duy nht l n khng c giao din trc quan: Mun x l video, bn phi lp trnh script. Bn c ba s la chn:

Hc ngn ng script ca AVISynth trong phn ti liu i km (khng n mc qu kh) v tham kho thm trn mng, y l cch hiu qu nht nhng kh tn thi gian. iu thu c l bn s lm ch c tt c mi th mc thp nht

Hc nhng lnh c bn ca AVISynth ch c khung hnh t DGIndex, cc thao tc x l video khc s c thc hin bng VirtualDub trc khi nn: Chm hn, hn ch hn, nhng li c giao din trc quan.

S dng chng trnh AVS Script Generator, chn thao tc x l video v t tham s, chng trnh s t ng sinh ra m lnh x l video cho bn. Tt nhin AVS Script Generator ch sinh ra m lnh cho nhng thao tc thng dng nht m theo kinh nghim ca ti l nhng b lc cc k quan trng m VirtualDub khng th lm c hoc lm chm hn rt nhiu. Cn nu mun s dng cc thao tc x l video khc bn c th tip tc son script trong NotePad hoc s dng cc b lc ca VirtualDub thay th. Di y ti hng dn cc bn s dng cch ny.

Bn m chng trnh AVS Script Generator ra (chng trnh ny nm trong nhm DGMPGDecDGIndex), chn file .d2v m DGIndex ghi li bc trc, AVS Script Generator s a ra vi thao tc x l video c bn bn la chn (Nu bn khng chc v thao tc x l no , bn c th th thit lp n v ghi li file .AVS, sau m file .AVS trong VirtualDub nh mt cch preview xem hiu ng ca thao tc ny)

Di y l cc chc nng chnh m bn c th thit lp:

Post-Processing (kh li nn Mpeg-2)Hnh nh trn DVD thng c hai loi nhiu: blocking v ringing. Hai loi nhiu ny l do li nn MPEG-2 ch khng phi do li quay phim:

blocking l nhiu xut hin trong on video c hnh chuyn ng nhanh, d liu ca MPEG-2 khng hin th nn to ra cc khi vung lt kn nhng ch chuyn ng.

ringing l nhiu xut hin trong on video c hnh tnh, d liu ca MPEG-2 khng hin th nn to ra cc ng vn bn cnh nhng nt r (mt ngi, vin o)

Cc thao tc Post-Processing loi b ht hai loi nhiu ny. H thng kh nhiu c th thc hin trn thnh phn sng (Y - Luma) hoc thnh phn mu (UV - Chroma), hoc c hai. Hai gi tr Moderate_H v Moderate_V kim sot mnh ca thao tc kh nhiu: Gi tr cng nh, b lc cng mnh, kh c nhiu nhiu nhng cng c phn lm m hnh. Theo kinh nghim ca ti, bn nn thc hin thao tc kh nhiu blocking (Deblock) khi thy cn thit, cn nhiu ringing th ch nn kh khi thy qu l, v nhiu dng ny thng l mc chp nhn c, v thao tc Dering lm m hnh kh nhiu.

Noise Removal (kh nhiu m)Cc thit b quay phim d hin i n u cng li mt s nhiu m v nu khng b i nhng nhiu ny bn s mt kh nhiu d liu nn chng trong khi li khng huy ng d liu nn nhng chi tit khc nh ng nt, mu sc, chuyn ng.... nhiu cn khin cho mt vi b lc khc hot ng thiu chnh xc. Bn nn chn mt b lc lm trn ph hp vi video ca bn kh nhiu m, tuy cc b lc lm trn ny u kh chm nhng nu bn coi cht lng l trn ht th nn s dng loi b ht nhiu trc khi thc hin cc thao tc x l khc.

Deinterlacing (chng qut mnh) to cc chuyn ng mn v phc v cho cc pha quay chm, mt s camera ghi video di dng interlaced, c ngha l nu nh video c xem tc 25hnh/giy (PAL), camera s ghi tc gp i: 50 hnh/giy, thi im 1 camera ch ghi nhng dng qut l, thi im 2 ch

ghi nhng dng qut chn, sau dng thng tin ghi trong hai ln ny phi hp thnh mt khung hnh (frame). C tip tc lun phin nh vy. V d khi cc bn xem bng , tc 25 hnh/giy ch nh la mt ngi ch khng xc nh bng ln qua vch vi hay cha => gy tranh ci. Khi tc 50 hnh/giy s gip ch cho vic thc hin li mt pha quay chm. Tuy nhin, do cc dng qut chn v l c ghi hai thi im khc nhau, nn khi xem bnh thng, cc thit b hin th video s phi chu trch nhim chng qut mnh nu khng cc khung hnh tng ng vi chuyn ng nhanh s b "gai" . V d mt khung hnh b hiu ng qut mnh v sau khi kh:

Khc vi nhng b lc khc, vic chng qut mnh nht thit phi thc hin vi nhng video c li qut mnh nu bn khng mun c mt sn phm cui xu t hi. C rt nhiu thut ton chng qut mnh:

Blend: Vi hai dng chn/l lin tip, thut ton "trn" hai dng vo nhau

v thay bng hai dng mi. Hai dng mi ny ging nhau v cc im nh mang

gi tr bng trung bnh gi tr mu ly trn 2 dng ban u. Cch ny lm m hnh, to hiu ng "ma"

Discard: Vi hai dng chn/l lin tip, thut ton b i mt dng v thay

bng dng kia. Cch ny chp nhn mt mt na thng tin.

Double Speed (Bob): Mt tn gi khc l Stupid Bob: Nhn i tc

khung hnh (chng hn t 25 hnh/giy chuyn thnh 50 hnh/giy). Mt khung hnh s b chia ra lm hai fields: Mt field gm cc dng qut chn v mt field gm cc dng qut l, sau mi field s c dn chiu dc ln gp i to thnh mt khung hnh mi. (Cch ny cc h thng TV, DVD Player thng dng: Nu xem tc thng s c mt pha quay chm)

Progressive Scan: Tng t nh Bob, tc khung hnh c nhn i,

nhng khc vi Bob, Progressive Scan s gi nguyn nhng vng hnh tnh v t nguyn c vng ln hai khung hnh lin tip (ch khng chia fields ri dn chiu dc nh bob). Nh vy nhng ch hnh ng, video s c chuyn rt trn, cn nhng ch hnh tnh video s rt nt do gi c ton b phn gii. Cch ny cho cht lng tt nht.

Adaptive: Trong khi cc thut ton Blend v Discard lm m hnh v mt

nhiu thng tin, Bob v Progressive Scan li i hi bn phi c CPU v Video Card rt mnh mi xem c vi tc khung hnh gp i. Adaptive Deinterlacing khng lm thay i tc khung hnh, c gng gi nguyn nhng vng tnh v ch c gng kh hiu ng qut mnh nhng vng ng. Vic kh hiu ng qut mnh khng bao gi hon ho c, nhng Adaptive Deinterlacing

ch thc hin vic trn nhng vng ng l ni mt thng kh nhn ra nhng khim khuyt ca b lc Adaptive.

Khc vi nhng b lc "m" nh Blend, Discard, Bob..., cht lng ca

cc b lc chng qut mnh kiu Progressive Scan v Adaptive Deinterlacing ph thuc vo thut ton pht hin vng tnh v thut ton kh hiu ng qut mnh trn vng ng. C mt tham s c ghi trong file .d2v gi l Frame Type, tham s ny c th l Progressive hoc Interlaced. Nu tham s ny l Interlaced, c ngha l cc khung hnh c ghi theo kiu: ghi ht dng chn ring ri mi ti dng l, tc l c kh nng video c quay theo cch interlaced, trong trng hp ny chng trnh AVS Script Generator s t ng xut b lc Kernel Deinterlace chng qut mnh. Tuy vy cn ch rng rt nhiu video cng c ghi theo kiu m khng h b li qut mnh (v tham s Frame Type ch n thun l cch thc ghi d liu ch khng ni ln g c), bn cn xem th video trong DgIndex quyt nh c cn chng qut mnh khng. Thc hin vic chng qut mnh trn mt video khng c li qut mnh s lm gim cht lng v tn thi gian v ch. AVS Script Generator cung cp 3 b lc chng qut mnh kiu Adaptive: Kernel Deinterlace, TDeint, TomsMoComp; v 2 b lc chng qut mnh kiu Progressive Scan: Kernel Bob v TDeint Bob. Nhng b lc ny c xp theo th t t cht lng thp nht ti cao nht. Mc d vy, b lc cht lng thp nht trong s (Kernel Deinterlace) c cht lng hn hn nhng phng php "m" ri v ti khuyn bn nn s dng n t tc nhanh nht, bn c th s dng TDeint hay TomsMoComp nu bn l ngi kh tnh v cht lng; thm ch c th s dng Kernel Bob hoc TDeint Bob: cho cht lng tuyt vi, nhng bn cn ch rng nu

s dng hai b lc kiu Progressive Scan ny, bn s cn nn vi nhiu d liu hn ti bc sau gi c cht lng .

Cc cch chng qut mnh "m" nh Blend, Discard hay Stupid Bob u c th thc hin bng AVISynth, nhng do cht lng xu nn ti khng a vo danh mc la chn. Nu bn mun dng nhng thut ton ny c th son script ca AVISynth trong Notepad, hoc s dng b lc Deinterlace ca VirtualDub.

Cropping (xn ra)Xn ra loi b nhng vin en hoc nhiu ra khung hnh cho tn d liu m ho cc chi tit ny. Thao tc xn ra cho php bn b i L dng bn ra tri, T dng ra trn, R dng ra phi v B dng ra di ca mi khung hnh:

Ch : Nu xn ra bn nn chn tt c cc tham s chia ht cho 4, ct thm mt cht cng khng sao c.

Resizing (thay i kch thc khung hnh)Thay i kch thc khung hnh l t hai chiu ngang v dc l s chia ht cho 16, v chiu ngang khung hnh khng vt qu 720 pixels, nhm t tnh tng thch cao vi codec v cc chng trnh xem phim. Vic co nh khung hnh li cn gip qu trnh nn video nhanh hn,

gim nhiu vung trn mt khi nn vi bitrate thp (tuy phi tr gi bng vic mt bt phn gii). C nhiu thut ton thay i kch thc khung hnh, nhng theo ti thut ton Bilinear Resize l tt nht thu nh khung hnh v Bicubic Resize l tt nht phng to khung hnh

Vi ch v crop v resize C hai khi nim cn phn bit: Frame size v Aspect ratio. Frame size c quy nh theo chun video, vi h NTSC c th l 704x480, 720x480, 480x480, 352x240..., h PAL c th l: 704x576, 720x576, 352x576... Khi xem phim, mi khung hnh s c co/dn vi t l khc nhau trn hai chiu ngang/dc c t l Aspect ratio, thng l 16:9, 4:3 hoc 2.35:1. Cc thng s Frame Size v Aspect Ratio c DGIndex thng bo lc bn xem th video (preview). Ni cch khc: Hu ht cc chun video coi im nh ca cc thit b hin th khng phi l hnh vung. Nguyn nhn ca s phc tp ny khng ch do cng ngh ch to mn hnh m cn c tnh n s nhy cm ca mt ngi i vi phn gii ngang v phn gii dc l khc nhau. Tuy nhin cc im nh trn mn hnh my tnh (khng qu lc hu) li l hnh vung, dn ti mt khi nim mi : Kch thc hin th: Display Size. Display Size quy nh kch thc ca khung hnh trn thit b hin th c im nh vung, Display Size c t l ngang/dc ng bng (hoc xp x) Aspect Ratio. Bt k Frame Size nh th no, khung hnh s c co/dn thnh Display Size trc khi hin th ra mn hnh. V d b gii m FFDShow t mc nh cho:

V d 1: NTSC DVD: Frame Size 720x480, Aspect Ratio 16:9, Display

Size s l: 852x480

V d 2: NTSC DVD: Frame Size 720x480, Aspect Ratio 4:3, Display Size

s l: 720x540 hoc 640x480 (tu theo card ho ca bn mnh ti u) ng tic l dng container .AVI v .MP4 thng b qua thng s Aspect Ratio cng nh Display Size v coi im nh l hnh vung. iu khin bn phi thay i Frame Size cho ph hp vi Aspect Ratio, nu khng bn s thy mt ngi di hn thc t trong trng hp th nht hoc hnh ngi b bo v ln trong trng hp th hai. Khc vi dng .AVI v .MP4, chng ta c th t Aspect Ratio hoc Display Size trong sn phm cui (file .MKV) nn bn c th t kch thc khung hnh (resizing) mt cch tu , min sao c hai chiu ngang v dc l s chia ht cho 16 v chiu ngang khung hnh khng vt qu 720 pixels. Tuy vy, nn nh rng thao tc xn ra (cropping) s ko theo vic thay i Aspect Ratio khc vi trn DVD gc, v bn s phi t lm ton tnh li Aspect Ratio v kch thc hin th thc s bc cui cng: Lm file .MKV. Vic cui cng l bn bm Save ghi li file .AVS v m file .AVS ny trong VirtualDub x l tip v nn.

Chun b nn video bng VirtualDubBn m VirtualDub ra, ko file .AVS th vo ca s VirtualDub. on mk ca bn s hin th trong 2 ca s con: input video (video qua x l bng AVISynth) v output video (video sau khi x l thm bng VirtualDub), ban u 2 panel ny ging nhau (VirtualDub cha x l g c).

Nu v mt l do no m input/output video khng hin th, bn vo Options v check vo c hai ch Show Input Video v Show Output Video.

Nu bn thnh tho AVISynth, bn nn x l video hon ton bng AVISynth bng cch son AVS Script trong mt chng trnh son tho bt k nh NotePad. Cn nu bn khng thnh tho, bn c th thc hin cc chc nng x l video ca VirtualDub t trong menu: Video/Filters. Ch l nu bn c s dng mt b lc no ca VirtualDub, bn cn vo menu Video v chn phn Full Processing Mode. Cn nu bn thy khng cn dng b lc no ca VirtualDub th bn chn phn Fast Recompress vic nn nhanh hn do khng phi chuyn i khng gian mu (t YUY2/YV12 ca DVD sang RGB ca VirtualDub v ngc li)

NN VIDEO BNG VIRTUALDUB+XVIDVic cui cng trong cng on x l Video l nn. Nhng thao tc x l t trc ti gi mi ch l dng "kch bn", cho ti lc chng ta ra lnh nn, nhng ng dng sau s ng thi c kch hot:

DgDecode.dll c khi ng gii m files .VOB, ri chuyn cc frames cho AVISynth

AVISynth nhn frame, x l theo scripts lp sn, ri chuyn qua cho VirtualDub VirtualDub nhn frame, thc hin cc b lc ri np XviD Encoder vo nn thnh file .AVI

Ti sao li dng XviD?C vi l do ti sao li chn XviD:

XviD khng phi chun cho t l cht lng/kch thc ln nht, nhng cng c coi l kh p.

XviD sch (khng c cha spyware, adware, virus) v c tng thch cao. XviD c th tu bin nhiu tham s v d dng. Nhng chun nn video c t l cht lng/kch thc cao hn XviD nh VP7, x264... li nn kh chm hoc cha hon thin. C hai chun ny ch cn lng d liu bng 2/3 so

vi XviD l t cht lng tng ng. Nhng nu bn dng VP7 hay x264, bn cn c mt my tnh cu hnh rt mnh v vic nn mt thi gian gp 3-5 ln so vi XviD.

XviD hin s dng H263 optimization, nhng chc chn H264 optimization sau khi hon thin cng s c tch hp vo XviD phin bn mi. V vy nu VP7 khng ph bin cho lm do VP7 khng phi MPEG4-compliant, th x264 hin t c s dng v a s ngi dng ang i mt phin bn n nh hn ca H264 c tch hp trong XviD.

CBR, VBR v Full-QualityBit-rate (bitrate) l lng d liu c ra t file dng hin th video trong 1 giy. Vi chun m ho video XviD, c hai cch nn: CBR - Constant Bit Rate (dng mt lng bitrate ging nhau cho tt c cc on ca video) v VBR - Variable Bit Rate (Mi on video s s dng bitrate mt khc).

Vi nhng on hnh khng thay i nhiu th ch cn mt lng nh d liu l trong khi vi nhng on khung hnh bin i nhanh s cn mt lng d liu rt ln hin th. Khi nu s dng CBR nn, nhng on video thay i t, bn s b lng ph bitrate, cn nhng on video thay i nhiu, bn s b thiu d liu hin th lm gy ra hiu ng Artifact (chng hn nh frame b "lt vung"). S dng VBR th p hn CBR vi cng kch thc file. Nn CBR kh d dng qua vic thc hin XviD Single Pass Bitrate-based Encoding, bn c th t tm hiu. y ti gii thiu cch nn VBR nn kiu VBR, li c hai cch lm: Double-pass encoding v Single-pass quality-based encoding.

Double-pass encoding: Cch ny cho cht lng p nht, nhng bn cn hai ln nn lin tip. Ln 1 ch dng thng k v phn b bit rate, ln 2 mi l nn tht. Ln 2 da vo cc ch s thng k ca ln 1 ti u ho vic phn b I/P/B-frames v bitrate.

Single-pass quality-based encoding: Cch ny tuy cht lng khng p bng Doublepass encoding nhng cng kh tt. C th gii thch nh sau: Trong qu trnh nn, XviD c mt s o "lng t" gi l quantizer o cht lng video. Quantizer=1 l FullQuality (cht lng tt nht m XviD c th t ti) v Quantizer=32 l cht lng ti nht (s cho file kch thc nh nht c th). Trong cch nn quality-based, bn cn xc nh cht lng cn t ti bng cch t quantizer, sau XviD s bm theo ch s cht lng ny v t ng tng bitrate ti nhng on hnh phc tp, nhiu chuyn ng, cng nh t ng gim bitrate ti nhng on hnh tnh, n gin, sao cho tt c cc on hnh trong video u c nn ng vi cht lng do bn ch nh.

Double-pass encoding

u im: Cch ny cho cht lng p nht, c lng c kch thc file sau khi nn. Nhc im: Kh chm v bn cn hai ln nn lin tip. Ln 1 ch dng thng k v phn b bit rate, ln 2 mi l nn tht. Ln 2 da vo cc ch s thng k ca ln 1 ti u ho vic phn b I/P/B-frames v bitrate.

Quy trnh thc hin: Bn to mt "kch bn" nn ln 1 vi "twopass-1st pass", to mt "kch bn" tip theo nn ln 2 vi "twopass-2nd pass", v VirtualDub thc hin lin tip theo hai kch bn ny. By gi bn hy quay li ca s VirtualDub v lm theo ng hng dn

The 1st pass:

Bn vo menu Video/Compression - Ctrl+P, chn XviD MPEG-4 codec, ri bm Configure:

Bn bm Load Default quay v thit lp mc nh ca XviD, sau t Encoding Type l "Twopass - 1st pass", bm OK nhn v OK tip ng lun ca s Compression.

Bn chn File/Save as (F7), ch ra tn file .AVI mun ghi vo, nh chn vo ch "Don't run this job now...":

The 2nd pass:Bn vo li menu Video/Compression - Ctrl+P, chn XviD MPEG-4 codec, bm Configure, ln ny chn Encoding Type l "Twopass-2nd pass". Trn ca s ny nu ang hin nt Target size (kbytes) th bn bm vo nt chuyn qua Target Bitrate (kbps)

Ti lt nn th hai ny, bn phi ch ra bitrate trung bnh nn video, c hai cch t:

t theo kinh nghim: nn DVD xung cht lng VCD, trong Target bitrate, bn ch cn in t 300 ti 500 l , cn t cht lng DVD, bn c th chn gi tr t 840 (Xem tt) ti 2400 (cc p), tu theo "kh tnh" ca bn v cht lng.

t theo kch thc: Bn mun t gi tr bitrate sao cho file video cui cng thu c xp x mt kch thc no , lm iu ny bn bm nt calc m ca s Bitrate calculator. Trong Target size, bn t gi tr (KB) ca file video bn mun nn xung, in ng thi gian ca video, tc khung hnh... ng thi c lng file m thanh ca bn s c kch thc bao nhiu (bn c th c bi sau v nn m thanh trc xc nh chnh xc kch thc phn m thanh). Bm OK v XviD s t ng tnh gi tr bitrate tng ng t kch thc xp x kch thc bn ch nh:

Sau khi t bitrate, bn li chn File/Save as (F7), ch ra tn file .AVI mun ghi vo, vn phi nh chn vo ch "Don't run this job now...".

Hai "kch bn" dng xong, by gi l "din": Trong ca s chnh ca VirtualDub, bn bm F4 (File/Job Control) m ca s Job Control (C 2 jobs cn thc hin), bm Start:

Sau trong ca s chnh, bn dng menu Options/Display Status Window theo di qu trnh nn, nh ng cho hin Input/Output video na qu trnh RIP c nhanh hn. Vic cn li ca bn l ... i ng v m v mt tng lai tt p hn. Khi vic x l hon thnh, bn c th xo file .AVI to ra bi 1st-pass, ch gi li file .AVI to bi 2nd-pass cng l sn phm ca bn sau khi thc hin Double-pass encoding (c th xem th kim tra cht lng, tuy file ny vn cha c ting v cha c t ng kch thc hin th cng nh Aspect Ratio). Nu thc hin double-pass encoding, vic xc nh bitrate cho 2nd-pass quyt nh cht lng v kch thc video. Vic chn ny hon ton l cm tnh v kh c th a ra mt bitrate c nh cho tt c cc videos. Tuy nhin bn c th rng buc bng kch thc nh ni trn hoc a quyt nh da vo 1st-pass:

Mi ti mi pass ca XviD encoding, bn s thy VirtualDub hin th ca s XviD status, kt thc 1st-pass, ca s ny thng bo lng Avg bitrate:

chnh l lng bitrate trung bnh nn Full Quality (XviD "lossless"), tc l trong 2ndpass bn khng nn chn lng bitrate ln hn con s ny v s khng lm tng cht lng ln mt cht no ht. Nu bitrate ca 2nd-pass nh hn Full-quality bitrate, bn s thy ca s XviD status ca 2nd-pass hin th biu , trong mu xanh l v xanh lc b tri rng hn so vi 1st-pass. Tc l c s thay i cht lng. Nhng ng lo ngi v vic , nu 2nd bitrate vo khong 66% full-quality bitrate, bn s thy mu xanh l ri ch yu vo on 1-4 v mu xanh lc ri ch yu vo on 4-8, m bo mt thng khng th nhn ra s khc bit. Nu 2nd bitrate vo khong 50% so vi full-quality bitrate, m bo nu mt bn cch mn hnh LCD 21 inch chng 50cm cng khng nhn thy s khc bit vi DVD gc.

Single-pass quality-based encoding

u im: Gim c khong mt na thi gian nn so vi Double-pass. Nhc im: Bn khng th c lng c file sau khi nn s ln bao nhiu v ln ca file ph thuc vo phc tp ca video, l th nn xong mi bit c. Cht lng khng p bng Double-pass encoding vi cng mt kch thc file (nhng cng kh tt v chp nhn c).

Quy trnh thc hin: Bn vo menu Video/Compression - Ctrl+P, chn XviD MPEG-4 codec, ri bm Configure:

Bn bm Load Default quay v thit lp mc nh ca XviD, sau t Encoding Type l Single pass. Sau nu nt bm pha di ang ch Target bitrate (kbps) (tng ng vi ch nn CBR) th bn bm vo nt chuyn qua ch Target quantizer l ch nn quality-based:

Nhc li mt cht v cch nn quality-based: Trong qu trnh nn, XviD c mt s o "lng t" gi l quantizer o cht lng video. Bn cn xc nh cht lng cn t ti bng cch t quantizer, sau XviD s bm theo ch tiu cht lng ny v t ng tng/gim bitrate ph hp vi tng on hnh sao cho tt c cc on hnh trong video u c nn ng vi cht lng do bn ch nh. By gi bn cn in ch s cht lng quantizer vo: quantizer cng nh, cht lng cng cao:

Khng nn t quantizer=1. Tuy quantizer=1 c gi l Full-quality (cht lng tt nht m XviD c th t ti), nhng thc s cht lng khng khc g nu t quantizer=2, trong khi t quantizer=1 dng nh lm XviD "li" nn v xc nh chuyn ng, dn ti file xut qu ln ti mc khng cn thit. (i khi ln hn c kch thc DVD gc).

Vi quantizer=2. Gi tr ny dnh cho cc bn mun "backup" DVD vi cht lng tt nht ca XviD.

Vi quantizer nm trong khong t 2 ti 3. Tuy c s suy gim cht lng nhng m bo mt thng khng th nhn ra c

Vi quantizer nm trong khong t 3 ti 5. Bn cn c mt mn hnh kh ln v mt cn nhn st mi nhn ra c s thay i cht lng

Vi quantizer > 5: Tu theo d tnh ca bn, nhng lu l vi quantizer = 6 bt u c hin tng nho hnh ri.

Vic cui cng l vo menu File/Save as (F7), ch ra tn file .AVI mun ghi vo, vn phi ng chn vo ch "Don't run this job now..." na v bn s nn lun by gi ch khng cn lp kch bn ging nh trong Double-pass encoding:

Trn y ti gii thiu hai cch nn: XviD double-pass encoding v XviD single-pass, quality-based encoding. Nu bn dng nhng codec khc cho video (chng hn nh DivX hay x264), bn cng c th thc hin cch lm tng t.

NN M THANH BNG BESWEET+BELIGHT

m thanh c DGIndex tch ra t DVD thng l dng .AC3, WAV, MPA, MP2 hoc DTS. Nu bn mun gi nguyn nhng m thanh nh trn DVD th c th s dng lun nhng files ny m khng cn lm g c, xin chuyn sang c phn tip ngay. Cn nu bn mun chuyn i (nn) file m thanh sang dng khc cho nh hn, hoc tng m lng.... Th hng dn ny s gip bn chuyn i m thanh bng BeSweet+BeLight - c th coi l cng c chuyn i m thanh mnh nht hin nay. Di y ti gii thiu mt vi cch chuyn i m ti cho l tt nht thi im hin ti. Bn c th t tm hiu v cc cch khc. Ch :

V cc tham s chuyn i m thanh rt nhiu, khng th gii thch ht

c. Nn khi lm b ci t BeLight, ti t li cc tham s mc nh sao cho hp l nht trong vic lm m thanh cho file .MKV, v di y ti s hng dn cc bn t thm cc tham s t thit lp mc nh ny. Bn c th t thm cc thng s khc nu bn thc s hiu vic bn lm. Cn khng, xin n yn.

BeLight cho php bn a nhiu files vo danh sch, vi nh lm chc

nng chuyn i nhiu files mt lc lun. Nhng chc nng ny cha hon thin v cn li. V vy bn cn chuyn i tng file mt, cn nu bn mun chuyn i ht nhiu files, bn cn copy ln lt ht tt c cc "BeSweet CommandLine" a vo mt file .BAT v chy file .BAT ny.

Nu bn khng dng dng container .MKV m thch .MP4 hay .AVI hn

th cn ch nhng audio codecs no c th a c vo container .AVI v .MP4 tin hnh chuyn i m thanh ra mt dng tng thch vi cc containers ny.

Chuyn i m thanh thnh dng MP3 CBR Joint StereoTuy c mt vi chun nn stereo cht lng tt hn MP3 nh HE-AAC, Ogg Vorbis..., nhng tnh tng thch li km hn nhiu: trn my tnh th nghe vn tt nu ci K-lite mega codec pack, nhng chuyn sang cc thit b khc c th khng nghe c ting do khng tng thch phn cng . V vy ti chn dng .MP3 CBR joint stereo, bn c th t tm hiu v chuyn sang dng khc. (Dng MP3 VBR cng c tnh tng thch cao vi cc thit b nghe nhc, nhng rt d gy li trong .AVI container, ch nn dng trong .MP4 v .MKV container. M nu bn dng MP4 hay MKV th nn chuyn m thanh thnh dng HE-AAC 2.0 s c cht lng tt v nh hn nhiu).

Bn nn chuyn i m thanh thnh dng MP3 Stereo (2 loa) nu:

m thanh gc ca bn l dng Stereo (chng hn AC3 2.0) Hoc m thanh gc ca bn l dng Surround Dolby Digital (6 loa - AC3 5.1) nhng bn mun nn xung thnh m thanh stereo cho nh hn v t tnh tng thch cao hn.

u im ca m thanh MP3 stereo:

Tnh tng thch cao (m thanh MP3 stereo th hu nh my tnh no cng c th chi c m khng cn ci thm b gii m audio. a s cc thit b phn cng hin nay u h tr gii m trc tip MP3).

Kch thc nh Cht lng kh tt nu chn bitrate hp l.

Nhc im ca m thanh MP3 stereo:

Nu bn c mt h thng dn loa 5.1, bn cng s ch nghe c dng stereo, tt c hiu ng m thanh vm 3 chiu s b mt.

Tuy MP3 c tng thch rt cao, nhng v cht lng th m thanh MP3 khi nn bitrate thp (