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  • ffmpeg - merge mp3 and mp4 (duration difference)

    8 décembre 2017, par dfionov

    I’m trying to merge mp4 and mp3 files with ffmpeg.
    mp4 duration - 9.800 sec, mp3 - 58.540 sec. So i using -shortest key.
    Code :

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

    After that i got output.mp4 with duration 9.846. Where is my error ? Why output video longer than source ? (9.846 sec and 9.800 sec).

    Source mp4 MediaInfo :

    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                 : High@L3.1
    
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

    Source mp3 Mediainfo :

    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

    Console output :

    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 -show_packets output too big, so I loaded to pastebin
    https://pastebin.com/TYSMdceS

  • Encode Ogg/Opus with very specific structure

    28 septembre 2022, par sonovice

    I have an ogg/opus file with a pretty special structure that I would like to reproduce.

    


    opusinfo returns a few hints of how it was made :

    


    New logical stream (#1, serial: 59d24a85): type opus
Encoded with Lavf56.40.101
User comments section follows...
        encoder=Lavc56.60.100 libopus
        encoder_options=--quiet --bitrate 96 --vbr
        pad=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Opus stream 1:
        Pre-skip: 312
        Playback gain: 0 dB
        Channels: 2
        Original sample rate: 48000Hz
        Packet duration:   60.0ms (max),   56.6ms (avg),   20.0ms (min)
        Page duration:   1460.0ms (max),  323.6ms (avg),  120.0ms (min)
        Total data length: 38872802 bytes (overhead: 1.12%)
        Playback length: 51m:11.473s
        Average bitrate: 101.2 kb/s, w/o overhead: 100.1 kb/s
Logical stream 1 ended


    


    Lavf/Lavc suggests that it was made with FFMPEG, but I am not able to find suitable settings.

    


    Looking at the actual bytes, it starts with an 0x200 (512) byte long ogg page containing metadata, followed by an 0xE00 (3584) byte long ogg page with actual audio content. Both pages sum up exactly to 0x1000 (4096) bytes.
Head of the ogg file

    


    After that, each page is exactly 0x1000 (4096) bytes long with potential zero padding, so that the pages start at offsets 0x1000, 0x2000, 0x3000 etc.
examplary page boundary

    


    Is there any known tool or library that can produce such ogg/opus files from PCM wave audio ?

    


    (Unfortunately I cannot share the file as it contains proprietary content.)

    


  • af_volume : implement replaygain pre-amplification

    4 avril 2014, par Alessandro Ghedini
    af_volume : implement replaygain pre-amplification

    This adds a new "replaygain_preamp" option to the filter, and simply adds its
    
value to the replaygain gain value.
    

    Signed-off-by : Anton Khirnov <anton@khirnov.net>
    • [DBH] doc/filters.texi
    • [DBH] libavfilter/af_volume.c
    • [DBH] libavfilter/af_volume.h

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