ffmpeg - mp3 및 mp4 병합 (길이 차이)

ffmpeg로 mp4 및 mp3 파일을 병합하려고합니다. mp4 재생 시간 - 9.800 초, mp3 - 58.540 초. 그래서 - 단축키를 사용합니다. 코드 : 내가 시간 9.846로 output.mp4있어 그 후ffmpeg - mp3 및 mp4 병합 (길이 차이)

ffmpeg -i video.mp4 -i audio.mp3 -c:v libx264 -c:a aac -strict experimental -shortest output.mp4

. 내 오류는 어디에 있습니까? 왜 비디오를 소스보다 오래 출력합니까? (9.846 초 및 9.800 초).

소스 또는 MP4 Mediainfo를 :

General 
Complete name     : F:\video test\video.mp4 
Format       : MPEG-4 
Format profile     : Base Media 
Codec ID      : iso5 (iso5/dash) 
File size      : 3.19 MiB 
Duration      : 9 s 800 ms 
Overall bit rate    : 2 732 kb/s 
Encoded date     : UTC 2017-11-24 20:53:53 
Tagged date     : UTC 2017-11-24 20:53:53 

Video 
ID        : 1 
Format       : AVC 
Format/Info     : Advanced Video Codec 
Format profile     : [email protected] 
Format settings    : CABAC/4 Ref Frames 
Format settings, CABAC   : Yes 
Format settings, ReFrames  : 4 frames 
Codec ID      : avc1 
Codec ID/Info     : Advanced Video Coding 
Duration      : 9 s 800 ms 
Bit rate      : 2 729 kb/s 
Maximum bit rate    : 3 766 kb/s 
Width       : 1 280 pixels 
Height       : 720 pixels 
Display aspect ratio   : 16:9 
Frame rate mode    : Constant 
Frame rate      : 25.000 FPS 
Color space     : YUV 
Chroma subsampling    : 4:2:0 
Bit depth      : 8 bits 
Scan type      : Progressive 
Bits/(Pixel*Frame)    : 0.118 
Stream size     : 3.19 MiB (100%) 
Writing library    : x264 core 146 
Encoding settings    : cabac=1/ref=3/deblock=1:0:0/analyse=0x3:0x113/me=hex/subme=7/psy=1/psy_rd=1.00:0.00/mixed_ref=1/me_range=16/chroma_me=1/trellis=1/8x8dct=1/cqm=0/deadzone=21,11/fast_pskip=1/chroma_qp_offset=-2/threads=12/lookahead_threads=2/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=40/rc=crf/mbtree=1/crf=23.0/qcomp=0.60/qpmin=0/qpmax=69/qpstep=4/ip_ratio=1.40/aq=1:1.00 
Tagged date     : UTC 2017-11-24 20:53:53

소스 MP3 Mediainfo를 :

General 
Complete name     : F:\video test\audio.mp3 
Format       : MPEG Audio 
File size      : 1.19 MiB 
Duration      : 58 s 540 ms 
Overall bit rate mode   : Variable 
Overall bit rate    : 170 kb/s 
Writing library    : LAME3.99r 

Audio 
Format       : MPEG Audio 
Format version     : Version 1 
Format profile     : Layer 3 
Format settings    : Joint stereo/MS Stereo 
Duration      : 58 s 540 ms 
Bit rate mode     : Variable 
Bit rate      : 170 kb/s 
Minimum bit rate    : 32.0 kb/s 
Channel(s)      : 2 channels 
Sampling rate     : 44.1 kHz 
Frame rate      : 38.281 FPS (1152 SPF) 
Compression mode    : Lossy 
Stream size     : 1.19 MiB (100%) 
Writing library    : LAME3.99r 
Encoding settings    : -m j -V 2 -q 0 -lowpass 18.5 --vbr-new -b 32

콘솔 출력 :

ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers 
    built with gcc 7.2.0 (GCC) 
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx 
    libavutil  55. 78.100/55. 78.100 
    libavcodec  57.107.100/57.107.100 
    libavformat 57. 83.100/57. 83.100 
    libavdevice 57. 10.100/57. 10.100 
    libavfilter  6.107.100/6.107.100 
    libswscale  4. 8.100/4. 8.100 
    libswresample 2. 9.100/2. 9.100 
    libpostproc 54. 7.100/54. 7.100 
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4': 
    Metadata: 
    major_brand  : iso5 
    minor_version : 1 
    compatible_brands: iso5dash 
    creation_time : 2017-11-24T20:53:53.000000Z 
    Duration: 00:00:09.80, start: 0.000000, bitrate: 2732 kb/s 
    Stream #0:0(und): Video: h264 (High) (avc1/0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2259 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default) 
    Metadata: 
     handler_name : VideoHandler 
Input #1, mp3, from 'audio.mp3': 
    Duration: 00:00:58.54, start: 0.025057, bitrate: 170 kb/s 
    Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 170 kb/s 
    Metadata: 
     encoder   : LAME3.99r 
    Side data: 
     replaygain: track gain - -2.200000, track peak - unknown, album gain - unknown, album peak - unknown, 
Stream mapping: 
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264)) 
    Stream #1:0 -> #0:1 (mp3 (native) -> aac (native)) 
Press [q] to stop, [?] for help 
[libx264 @ 00000000005ab440] using SAR=1/1 
[libx264 @ 00000000005ab440] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX 
[libx264 @ 00000000005ab440] profile High, level 3.1 
[libx264 @ 00000000005ab440] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 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=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 
Output #0, mp4, to 'output.mp4': 
    Metadata: 
    major_brand  : iso5 
    minor_version : 1 
    compatible_brands: iso5dash 
    encoder   : Lavf57.83.100 
    Stream #0:0(und): Video: h264 (libx264) (avc1/0x31637661), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default) 
    Metadata: 
     handler_name : VideoHandler 
     encoder   : Lavc57.107.100 libx264 
    Side data: 
     cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1 
    Stream #0:1: Audio: aac (LC) (mp4a/0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s 
    Metadata: 
     encoder   : Lavc57.107.100 aac 
    Side data: 
     replaygain: track gain - -2.200000, track peak - unknown, album gain - unknown, album peak - unknown, 
frame= 54 fps=0.0 q=28.0 size=  0kB time=00:00:00.04 bitrate= 8.3kbits/s speed=0.0927x  
frame= 80 fps= 80 q=28.0 size=  0kB time=00:00:01.09 bitrate= 0.4kbits/s speed=1.09x  
frame= 98 fps= 65 q=28.0 size=  256kB time=00:00:01.83 bitrate=1143.5kbits/s speed=1.21x  
frame= 119 fps= 59 q=28.0 size=  512kB time=00:00:02.67 bitrate=1570.9kbits/s speed=1.32x  
frame= 144 fps= 56 q=28.0 size=  768kB time=00:00:03.66 bitrate=1715.0kbits/s speed=1.42x  
frame= 167 fps= 52 q=28.0 size= 1024kB time=00:00:04.57 bitrate=1833.9kbits/s speed=1.44x  
frame= 190 fps= 51 q=28.0 size= 1280kB time=00:00:05.50 bitrate=1905.5kbits/s speed=1.47x  
frame= 218 fps= 51 q=28.0 size= 1792kB time=00:00:06.64 bitrate=2210.6kbits/s speed=1.56x  
frame= 242 fps= 50 q=28.0 size= 2048kB time=00:00:07.56 bitrate=2216.4kbits/s speed=1.58x  
frame= 245 fps= 41 q=-1.0 Lsize= 3045kB time=00:00:09.82 bitrate=2539.6kbits/s speed=1.65x  
video:2880kB audio:156kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.298058% 
[libx264 @ 00000000005ab440] frame I:14 Avg QP:20.01 size: 39750 
[libx264 @ 00000000005ab440] frame P:106 Avg QP:23.85 size: 14578 
[libx264 @ 00000000005ab440] frame B:125 Avg QP:24.63 size: 6770 
[libx264 @ 00000000005ab440] consecutive B-frames: 22.9% 22.0% 15.9% 39.2% 
[libx264 @ 00000000005ab440] mb I I16..4: 16.7% 80.3% 3.0% 
[libx264 @ 00000000005ab440] mb P I16..4: 10.2% 36.2% 1.1% P16..4: 25.0% 7.9% 2.5% 0.0% 0.0% skip:17.1% 
[libx264 @ 00000000005ab440] mb B I16..4: 2.3% 5.8% 0.2% B16..8: 31.4% 6.5% 0.9% direct: 3.7% skip:49.2% L0:51.8% L1:44.5% BI: 3.7% 
[libx264 @ 00000000005ab440] 8x8 transform intra:76.1% inter:86.3% 
[libx264 @ 00000000005ab440] coded y,uvDC,uvAC intra: 38.3% 52.1% 9.0% inter: 12.3% 20.1% 0.2% 
[libx264 @ 00000000005ab440] i16 v,h,dc,p: 30% 28% 9% 33% 
[libx264 @ 00000000005ab440] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 23% 19% 3% 3% 4% 4% 4% 4% 
[libx264 @ 00000000005ab440] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 21% 14% 5% 7% 7% 6% 5% 3% 
[libx264 @ 00000000005ab440] i8c dc,h,v,p: 45% 24% 25% 6% 
[libx264 @ 00000000005ab440] Weighted P-Frames: Y:13.2% UV:6.6% 
[libx264 @ 00000000005ab440] ref P L0: 71.7% 12.5% 12.9% 2.7% 0.2% 
[libx264 @ 00000000005ab440] ref B L0: 92.8% 6.3% 0.9% 
[libx264 @ 00000000005ab440] ref B L1: 98.3% 1.7% 
[libx264 @ 00000000005ab440] kb/s:2406.56 
[aac @ 00000000005adde0] Qavg: 511.420

ffprobe 너무 큰 출력을 -show_packets, 그래서 나는 https://pastebin.com/TYSMdceS

출처

2017-12-06 dfionov

질문에 빠른 답변이는 FFmpeg/libaac가 추가 AAC는 -0.0213의 시작, 시작 부분에 패킷을 프라이밍 인코딩이다를 페이스트 빈에로드. 그것은 귀하의 기간에 추가됩니다. 나중에 도움이 될만한 답변이 있으면 자세히 설명하려고합니다. ffprobe -show_packets output.mp4을 시도 할 수 있습니다.

나는 당신이 공유 한 패킷 덤프를 조사했다.

dts: -0.08 | pts: 0.0 
dts: -0.04 | pts: 0.12 
dts: 0.0 | pts: 0.04 
dts: 0.04 | pts: 0.08 
dts: 0.08 | pts: 0.24 
... 
dts: 9.64 | pts: 9.76 
dts: 9.68 | pts: 9.72

전후 진은 U는 B가 I B B P 순서로 프레임이 때문에 값이 가능하다 PTS 같은 하면 비디오 패킷을 보인다. 비디오 스트림은 25 fps이며 1 frame duration = 0.04 s이됩니다. 그러면 동영상이 9.76 + 0.04(frame duration) = 9.8 s이됩니다.

원본 오디오가 비디오보다 크기 때문에 마지막 패킷이 최대 9.80 s or later이되도록 잘립니다. 오디오 패킷이

pts: -0.023220 (AAC priming data) 
pts: 0.0 
pts: 0.023220 
... 
pts: 9.775601 | duration: 0.023220 
pts: 9.798821 | duration: 0.023175

당신이 마지막 음성 패킷과 같이 9.80 또는 이후에 종료한다. 그래서 9.79의 패킷이 허용됩니다. AV 스트림에 오디오를 다중화하는 시간이 0.02322 (primiing pkt) + 9.798821 + 0.023175 (dur) = 9.845216

어디서 발생했는지 확신 할 수 없습니다. 다른 사람이 댓글을 달 수 있어야합니다. 처음에는 건너 뛴 데이터가 있습니다.

[SIDE_DATA] 
side_data_type=Skip Samples 
skip_samples=1024 
discard_padding=0 
skip_reason=0 
discard_reason=0 
[/SIDE_DATA]

이 정보가 도움이되기를 바랍니다.

출처

2017-12-07 23:38:50 Jay

게시물을 갱신하고 ffprobe 출력을 추가했습니다. – dfionov

ffmpeg - mp3 및 mp4 병합 (길이 차이)

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