[問題]點樣壓縮視頻嘅碼率?
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比較下面兩集動畫。前者1280x720,比後者640x480嘅SIZE重要細。 R-5e9vyS T0BM:ofx 雖然,後者有兩條音頻,但都係好細,13MB/條。就算將兩條音頻刪除,文件SIZ仍然係好大。 p"q4R2_/jh 所以,要點樣壓縮到好似前者一樣? tkEup& rY(^6[ ! 唔改變解像度,只改變碼率,應如何做? ^/jALA9! 6n'XRfQp)& G `JXi/#` 《死神》 d=:&tOCg2 General +FYhDB~m Complete name : F:\Video\[jumpcn][BLEACH][320][1280x720].mkv #zw 'H9l Format : Matroska df!n.&\y! File size : 280 MiB IF.6sJg: Duration : 24mn 7s ahm@ +/2 Overall bit rate : 1 621 Kbps /(skIvE| Encoded date : UTC 2011-05-03 17:33:29 r!J?Lc])8 Writing application : mkvmerge v2.9.9 ('Tutu') built on Nov 25 2009 21:13:32 C6(
WnO{6 Writing library : libebml v0.7.9 + libmatroska v0.8.1 $NhKqA`0 Video #1 |{H-PH*Iz ID : 1 7nL3+Pq Format : AVC 5x; y{qT Format/Info : Advanced Video Codec ckPI^0A! Format profile : [url=mailto:High@L4.0]High@L4.0[/url] U m9]X@z Format settings, CABAC : Yes o`]u& Format settings, ReFrames : 8 frames y!?l;xMS Muxing mode : Container profile=Unknown@4.0 pg'3j3JW$ Codec ID : V_MPEG4/ISO/AVC 0qrsf! Duration : 23mn 55s *k#M;e Nominal bit rate : 1 500 Kbps S<V__Sv Width : 1 280 pixels NuqWezJm& Height : 720 pixels '9MtIcNb Display aspect ratio : 16:9 E)dV;1t Frame rate : 23.810 fps F!;0eS"xp Original frame rate : 23.976 fps :}Tw+S5 Resolution : 24 bits *M_Gu{xc Colorimetry : 4:2:0 007SA6xq Scan type : Progressive gB\KD{E Bits/(Pixel*Frame) : 0.068 %:eepG| Writing library : x264 core 98 r1629 2e81ce1 Jy x6{Oj Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=6 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / weightp=0 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=1500 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=3486 / vbv_bufsize=3487 / ip_ratio=1.40 / aq=1:0.50 / nal_hrd=none bS+by'Ea1W Audio #2 U'st\Dt ID : 2 q=5#t~? Format : AAC T/"6iv\1 Format/Info : Advanced Audio Codec }7Si2S Format version : Version 4 MEQ:[;1 Format profile : LC
DdTTWp/ Format settings, SBR : No 05\A7.iy Codec ID : A_AAC 7mSVL\\^ Duration : 24mn 7s Y#_,Ig5. Channel(s) : 2 channels >ln% 3= Channel positions : L R {|%N Sampling rate : 44.1 KHz 9}FWO&LiB Resolution : 16 bits ) =<,$|g Text #3 1pC!F ;9Oo ID : 3 \+E{8&TH' Format : ASS q"5iza__H Codec ID : S_TEXT/ASS #N%xr'H Codec ID/Info : Advanced Sub Station Alpha 0l6z!@GhT Text #4 c~(+#a ID : 4 }u&.n
pc Format : ASS FW:x XK Codec ID : S_TEXT/ASS nZa.3/7dJ Codec ID/Info : Advanced Sub Station Alpha &}S#6|[i &dZ-}.
af ============================================= W6D|Rr.q Uu{I4ls6B 《GPX》 8*3<Er
v General DPJ#Y -0 Complete name : F:\Video\1992.新世紀GPX.高智能一級方程式Ⅱ-DoubleOne\02_.mkv 3(':4Tas Format : Matroska nnX,_5s File size : 320 MiB y~An'+yBa Duration : 26mn 54s FyX\S=
Overall bit rate : 1 663 Kbps s_-G`xT>{ Encoded date : UTC 2011-05-16 14:48:07 LY[XPV]t Writing application : mkvmerge v4.3.0 ('Escape from the Island') 编译于 Sep 5 2010 10:30:51 <\GP\G Writing library : libebml v1.0.0 + libmatroska v1.0.0 D)XF@z; Video #1 X>j% y7v ID : 1 6Yebc_, R Format : AVC T>s~bIzL*e Format/Info : Advanced Video Codec BB5(=n+ Format profile : [url=mailto:High@L4.0]High@L4.0[/url] BRbx. Format settings, CABAC : Yes R)d1]k8 Format settings, ReFrames : 2 frames 6U6,Wu Muxing mode : Container profile=Unknown@4.0 %N_5p'W Codec ID : V_MPEG4/ISO/AVC 6lOT5C eJ" Duration : 26mn 52s H=[
eO Width : 640 pixels js)M
c*]& Height : 480 pixels TJ8IYo|
D Display aspect ratio : 4:3 _Q,`Qn@|BD Frame rate : 23.976 fps oBiJiPE=` Original frame rate : 11.988 fps <7R\# Resolution : 24 bits Gs;wx_k^ Colorimetry : 4:2:0 G=Hvh=K( Scan type : Progressive 3ha^NjE Writing library : x264 core 38 svn-341 U/9xO"b{. Audio #2
4Ra ID : 2 [E<NEl* Format : AAC T#kPn#| Format/Info : Advanced Audio Codec 5'wWj}0!% Format version : Version 4 =vJ:R[Ilw Format profile : LC Qc1NLU9: Format settings, SBR : Yes BUB$k7{z Format settings, PS : No r Q)?Bhf Codec ID : A_AAC -Uj)6PzGu Duration : 26mn 54s @p`*MWU Channel(s) : 2 channels ybk~ m Channel positions : L R ][vm4UY Sampling rate : 44.1 KHz K|^PHe Resolution : 16 bits zD}@QoB Video delay : -83ms arVu`pD*n Title : Cantonese粵語 HrOq>CSR Language : Chinese P}"=67$ Audio #3 d `MTc ID : 3 #3VOC#. Format : AAC "Y'MuV'x Format/Info : Advanced Audio Codec QK~44;LVIJ Format version : Version 4 dw*PjIB9x Format profile : LC nm#ISueh Format settings, SBR : Yes 6DkFI
kS Format settings, PS : No @n|Mr/PAj Codec ID : A_AAC Fal##6B Duration : 26mn 54s Ppton+?( Channel(s) : 2 channels k`we_$/Gw Channel positions : L R eW<|I Sampling rate : 44.1 KHz kJ'rtz4QO Resolution : 16 bits I%|,KWM Video delay : -83ms a Fh9B\n Title : 日語 c1ga{c`Z Language : Japanese
WrHY' 1agNwFd~ ==============================================================
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