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2019.11.08 10:32

비트레이트 똑같이 인코딩하는데 결과물 보면 비트레이트가 낮게 나오는데요

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안녕하세요, 비트레이트 관련 글 검색해서 다 읽어봤지만 해결이 안되서 글 남깁니다 ㅠ

 

20191108_103005.png

 

원본 파일 비트레이트가 30000이면 똑같이 30000으로 인코딩 하고 싶어서 설정에서 똑같이 비트레이트를 설정해봐도 결과물 보면 비트레이트가 18000입니다.

 

왜 그런 걸까요?? 비트레이트 설정값이 평균값이라는데...

 

비트레이트 똑같이 인코딩 하는 방법이 있을까요??

 

Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (isom/mp41/avc1)
File size                                : 17.6 GiB
Duration                                 : 1 h 23 min
Overall bit rate mode                    : Variable
Overall bit rate                         : 30.3 Mb/s
Encoded date                             : UTC 2019-06-15 08:13:10
Tagged date                              : UTC 2019-06-15 08:13:10
Writing library                          : Apple QuickTime

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4.1
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 2 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 1 h 23 min
Source duration                          : 1 h 23 min
Bit rate                                 : 30.0 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 29.970 (30000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.483
Stream size                              : 17.4 GiB (99%)
Source stream size                       : 17.4 GiB (99%)
Language                                 : English
Encoded date                             : UTC 2019-06-15 08:13:10
Tagged date                              : UTC 2019-06-15 08:13:10
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
mdhd_Duration                            : 4986048

Audio
ID                                       : 2
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : LC
Codec ID                                 : 40
Duration                                 : 1 h 23 min
Bit rate mode                            : Variable
Bit rate                                 : 320 kb/s
Maximum bit rate                         : 326 kb/s
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 spf)
Compression mode                         : Lossy
Stream size                              : 190 MiB (1%)
Language                                 : English
Encoded date                             : UTC 2019-06-15 08:13:10
Tagged date                              : UTC 2019-06-15 08:13:10

Other #1
ID                                       : 3
Type                                     : Object description
Format                                   : System Core
Codec ID                                 : 2
Duration                                 : 1 h 23 min
Language                                 : English
Encoded date                             : UTC 2019-06-15 08:13:10
Tagged date                              : UTC 2019-06-15 08:13:10
mdhd_Duration                            : 1000

Other #2
ID                                       : 4
Type                                     : Scene description
Format                                   : System Core
Codec ID                                 : 2
Duration                                 : 1 h 23 min
Language                                 : English
Encoded date                             : UTC 2019-06-15 08:13:10
Tagged date                              : UTC 2019-06-15 08:13:10
mdhd_Duration                            : 1000

 

 

^ 위 정보가 원본 파일이고

 

 

 

 

 

 

 

1080AVC (2).mpeg
Format                                   : MPEG-PS
File size                                : 11.5 GiB
Duration                                 : 1 h 23 min
Overall bit rate mode                    : Variable
Overall bit rate                         : 19.8 Mb/s

Video
ID                                       : 224 (0xE0)
Format                                   : MPEG Video
Format version                           : Version 2
Format profile                           : Main@High
Format settings, BVOP                    : No
Format settings, Matrix                  : Default
Format settings, GOP                     : Variable
Duration                                 : 1 h 23 min
Bit rate mode                            : Variable
Bit rate                                 : 19.1 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 29.970 (30000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 0.307
Time code of first frame                 : 00:00:00:00
Time code source                         : Group of pictures header
GOP, Open/Closed                         : Open
GOP, Open/Closed of first frame          : Closed
Stream size                              : 11.1 GiB (96%)

Audio
ID                                       : 192 (0xC0)
Format                                   : MPEG Audio
Format version                           : Version 1
Format profile                           : Layer 2
Duration                                 : 1 h 23 min
Bit rate mode                            : Constant
Bit rate                                 : 320 kb/s
Channel(s)                               : 2 channels
Sampling rate                            : 48.0 kHz
Compression mode                         : Lossy
Stream size                              : 190 MiB (2%)
 

 

이게 출력 파일입니다.

 

출력 파일 형식은 mpeg2로 해야 하거든요 ㅠ

 

 

고수님들 도와주세요  ㅠ

 

 

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