샤나 인코더를 통해서
-f mp4
-c:v libx264 -x264-params "nal-hrd=cbr" -b:v 1M -minrate 1M -maxrate 1M -bufsize 2M -r 29.97
-c:a libmp3lame -b:a 128k
-sn -map_metadata -1 -map_chapters -1 -ac 2 -r 29.97 -lamebtmode cbr
위 값으로 H264 CBR 모드로 인코딩 하였는데 아래의 결과 값에서 궁금증이 생겼습니다.
General
Complete name : 착한 아이 사탕이.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 37.3 MiB
Duration : 4 min 36 s
Overall bit rate mode : Constant
Overall bit rate : 1 133 kb/s
Tagged date : UTC 2017-04-28 06:40:00
Writing application : ShanaEncoder
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 4 min 36 s
Bit rate mode : Constant
Bit rate : 1 000 kb/s / 1 000 kb/s
Width : 1 920 pixels
Height : 1 200 pixels
Display aspect ratio : 16:10
Frame rate mode : Variable
Frame rate : 16.170 FPS
Minimum frame rate : 5.994 FPS
Maximum frame rate : 29.970 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.027
Stream size : 32.9 MiB (88%)
Writing library : x264 core 148 r2762 90a61ec
Encoding settings : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=12 / lookahead_threads=4 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=cbr / mbtree=1 / bitrate=1000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=1000 / vbv_bufsize=2000 / nal_hrd=cbr / filler=1 / ip_ratio=1.40 / aq=1:1.00
Audio
ID : 2
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Mode : Joint stereo
Mode extension : MS Stereo
Codec ID : 6B
Duration : 4 min 36 s
Bit rate mode : Constant
Bit rate : 128 kb/s
Channel(s) : 2 channels
Sampling rate : 44.1 kHz
Compression mode : Lossy
Stream size : 4.21 MiB (11%)
Writing library : LAME3.99
Default : Yes
Alternate group : 1
Bit rate mode : Constant 로 되어 있는데 Frame rate mode : Variable 로 되어있습니다.
프레임 레이트 모드도 VBR이나 CBR이 가능한거 였나요? 이것 또한 CBR로 바꿀 수 있는지 궁금합니다.
그리고 프레임을 29.97로 변경하였는데 VBR 모드 떄문인지
Minimum frame rate : 5.994 FPS
Maximum frame rate : 29.970 FPS
로 나오네요. CBR로 변경하면 29.97 하나의 값으로 변경되는지 궁금합니다.