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  • FFMPEG results in a silent video when trying to combine video and audio tracks

    23 septembre 2017, par Stuart Clarke

    I’m using the following command to combine a video and an audio track.

    ffmpeg -y -i /var/www/temp/merged.mp4 -i /var/www/temp/combined.mp3 -strict -2 /var/www/temp/videoExtouiulbjryzxlehjj2.mp4

    Edit :

    Here is the output from the first command

    ffmpeg version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
    
  libavutil      54. 15.100 / 54. 15.100
    
  libavcodec     56. 13.100 / 56. 13.100
    
  libavformat    56. 15.102 / 56. 15.102
    
  libavdevice    56.  3.100 / 56.  3.100
    
  libavfilter     5.  2.103 /  5.  2.103
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/temp/merged.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf56.15.102
    
  Duration: 00:02:31.80, start: 0.000000, bitrate: 2384 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2381 kb/s, 25.43 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 0 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
Input #1, mp3, from '/var/www/temp/audioTrack.mp3':
    
  Metadata:
    
    encoder         : Lavf56.15.102
    
  Duration: 00:02:08.94, start: 0.011995, bitrate: 128 kb/s
    
    Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    
    Metadata:
    
      encoder         : Lavf
    
[libx264 @ 0x1e903a0] using SAR=1/1
    
[libx264 @ 0x1e903a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
    
[libx264 @ 0x1e903a0] profile High, level 4.0
    
[libx264 @ 0x1e903a0] 264 - core 142 r2495 6a301b6 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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 '/var/www/temp/videoExtvzxvphotsyfpcbkd.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf56.15.102
    
    Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
      encoder         : Lavc56.13.100 libx264
    
    Stream #0:1(und): Audio: mp3 (libmp3lame) (i[0][0][0] / 0x0069), 48000 Hz, stereo, fltp (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
      encoder         : Lavc56.13.100 libmp3lame
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
    
  Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))
    
Press [q] to stop, [?] for help
    
frame=   31 fps=0.0 q=0.0 size=       0kB time=00:00:01.05 bitrate=   0.4kbits/s dup=1 drop=0frame=   46 fps= 41 q=0.0 size=       0kB time=00:00:01.56 bitrate=   0.2kbits/s dup=1 drop=0frame=   52 fps= 32 q=29.0 size=     149kB time=00:00:01.75 bitrate= 698.4kbits/s dup=1 drop=frame=   64 fps= 28 q=29.0 size=     258kB time=00:00:02.16 bitrate= 977.2kbits/s dup=1 drop=frame=   74 fps= 26 q=29.0 size=     389kB   
    
video:39673kB audio:211kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.143487%
    
[libx264 @ 0x1e903a0] frame I:27    Avg QP:18.78  size: 58834
    
[libx264 @ 0x1e903a0] frame P:2202  Avg QP:23.67  size: 14187
    
[libx264 @ 0x1e903a0] frame B:2323  Avg QP:25.75  size:  3356
    
[libx264 @ 0x1e903a0] consecutive B-frames: 24.7% 18.7%  9.0% 47.5%
    
[libx264 @ 0x1e903a0] mb I  I16..4: 18.8% 74.7%  6.5%
    
[libx264 @ 0x1e903a0] mb P  I16..4:  2.1%  5.0%  0.3%  P16..4: 22.2%  6.0%  1.9%  0.0%  0.0%    skip:62.5%
    
[libx264 @ 0x1e903a0] mb B  I16..4:  0.1%  0.3%  0.0%  B16..8: 19.9%  1.0%  0.1%  direct: 0.3%  skip:78.3%  L0:42.3% L1:55.3% BI: 2.4%
    
[libx264 @ 0x1e903a0] 8x8 transform intra:68.2% inter:86.5%
    
[libx264 @ 0x1e903a0] coded y,uvDC,uvAC intra: 35.8% 52.3% 4.5% inter: 5.2% 7.4% 0.0%
    
[libx264 @ 0x1e903a0] i16 v,h,dc,p: 28% 23%  8% 40%
    
[libx264 @ 0x1e903a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 20% 22%  3%  6%  6%  7%  5%  4%
    
[libx264 @ 0x1e903a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 21% 14%  4%  8%  7%  7%  4%  3%
    
[libx264 @ 0x1e903a0] i8c dc,h,v,p: 56% 18% 20%  6%
    
[libx264 @ 0x1e903a0] Weighted P-Frames: Y:0.9% UV:0.2%
    
[libx264 @ 0x1e903a0] ref P L0: 73.4% 13.0% 10.0%  3.6%  0.0%
    
[libx264 @ 0x1e903a0] ref B L0: 92.2%  6.7%  1.1%
    
[libx264 @ 0x1e903a0] ref B L1: 96.6%  3.4%
    
[libx264 @ 0x1e903a0] kb/s:2139.74

    End Edit

    I know this should work since the exact line does work for other files. But the result with these is a silent video.

    I checked the audio file being used and it seemed fine when played. but I did get a weird warning when creating it. Basically I have 2 audio tracks, one is overlay music and the other is talking. I create the combined audio with this command.

    ffmpeg -y -i /var/www/temp/audioTrack.mp3 -i /var/www/temp/musicTrack.mp3 -filter_complex amerge -c:a libmp3lame -q:a 4 /var/www/temp/combined.mp3

    Here is the output from the second command.

    ffmpeg version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
    
  libavutil      54. 15.100 / 54. 15.100
    
  libavcodec     56. 13.100 / 56. 13.100
    
  libavformat    56. 15.102 / 56. 15.102
    
  libavdevice    56.  3.100 / 56.  3.100
    
  libavfilter     5.  2.103 /  5.  2.103
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mp3, from '/var/www/temp/audioTrack.mp3':
    
  Metadata:
    
    encoder         : Lavf56.15.102
    
  Duration: 00:02:08.89, start: 0.025057, bitrate: 128 kb/s
    
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc56.13
    
Input #1, mp3, from '/var/www/temp/musicTrack.mp3':
    
  Metadata:
    
    encoder         : Lavf56.15.102
    
  Duration: 00:02:08.89, start: 0.025057, bitrate: 128 kb/s
    
    Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc56.13
    
[Parsed_amerge_0 @ 0x15e3760] No channel layout for input 1
    
[Parsed_amerge_0 @ 0x15e3760] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
    
Output #0, mp3, to '/var/www/temp/combined.mp3':
    
  Metadata:
    
    TSSE            : Lavf56.15.102
    
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p (default)
    
    Metadata:
    
      encoder         : Lavc56.13.100 libmp3lame
    
Stream mapping:
    
  Stream #0:0 (mp3) -> amerge:in0
    
  Stream #1:0 (mp3) -> amerge:in1
    
  amerge -> Stream #0:0 (libmp3lame)
    
Press [q] to stop, [?] for help
    
[libmp3lame @ 0x1601000] Trying to remove 1152 samples, but the queue is empty
    
size=    2001kB time=00:02:08.88 bitrate= 127.2kbits/s    
    
video:0kB audio:2001kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.012350%

    Of note is these sections (I believe).

    [Parsed_amerge_0 @ 0x15e3760] No channel layout for input 1
    
[Parsed_amerge_0 @ 0x15e3760] Input channel layouts overlap: output layout will be determined by the number of distinct input channels

    and

    [libmp3lame @ 0x1601000] Trying to remove 1152 samples, but the queue is empty

    As I said the output audio file sounds correct.

    The Music and Audio tracks are created with AudioSegment in python from the pydub library. I’ve used this before with no issues. The code for this is as follows.

    sound = AudioSegment.from_mp3(audio)
    
introSilence = AudioSegment.silent(duration=introLength)
    
creditsSilence = AudioSegment.silent(duration=creditsLength)
    
increasedAudio = sound + 12
    
talking = introSilence + increasedAudio + creditsSilence
    
talking.export(audioTrack, format="mp3")
    
mus = AudioSegment.from_mp3(music)
    
introMusic = mus[ : introLength]
    
videoMusic = mus[introLength - crossFade : introLength + videoLength + crossFade]
    
creditsMusic = mus[totalLength - creditsLength : totalLength]
    
lowerMusic = videoMusic - 6
    
totalMusic = introMusic.append(lowerMusic, crossfade=crossFade).append(creditsMusic, crossfade=crossFade).fade_out(fadeOut)
    
totalMusic.export(musicTrack, format="mp3")

    Here is the output of ffprobe on the 2 audio files.

    for audioTrack

    ffprobe version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2007-2016 the FFmpeg developers
    
  built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
    
  libavutil      54. 15.100 / 54. 15.100
    
  libavcodec     56. 13.100 / 56. 13.100
    
  libavformat    56. 15.102 / 56. 15.102
    
  libavdevice    56.  3.100 / 56.  3.100
    
  libavfilter     5.  2.103 /  5.  2.103
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mp3, from 'temp/audioTrack.mp3':
    
  Metadata:
    
    encoder         : Lavf56.15.102
    
  Duration: 00:02:08.89, start: 0.025057, bitrate: 128 kb/s
    
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc56.13

    and for musicTrack

    ffprobe version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2007-2016 the FFmpeg developers
    
  built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
    
  libavutil      54. 15.100 / 54. 15.100
    
  libavcodec     56. 13.100 / 56. 13.100
    
  libavformat    56. 15.102 / 56. 15.102
    
  libavdevice    56.  3.100 / 56.  3.100
    
  libavfilter     5.  2.103 /  5.  2.103
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mp3, from 'temp/musicTrack.mp3':
    
  Metadata:
    
    encoder         : Lavf56.15.102
    
  Duration: 00:02:08.89, start: 0.025057, bitrate: 128 kb/s
    
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc56.13

    I can’t see any issues with these.

    For completeness here is the ffprobe result for the combined audio track.

    ffprobe version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2007-2016 the FFmpeg developers
    
  built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
    
  libavutil      54. 15.100 / 54. 15.100
    
  libavcodec     56. 13.100 / 56. 13.100
    
  libavformat    56. 15.102 / 56. 15.102
    
  libavdevice    56.  3.100 / 56.  3.100
    
  libavfilter     5.  2.103 /  5.  2.103
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mp3, from 'temp/combined.mp3':
    
  Metadata:
    
    encoder         : Lavf56.15.102
    
  Duration: 00:02:08.91, start: 0.025057, bitrate: 127 kb/s
    
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 127 kb/s
    
    Metadata:
    
      encoder         : Lavc56.13

    Any help would be much appreciated.

    Thanks,

    Stu.

  • FFMpeg silent video for 1 seconds every 5 seconds

    20 avril 2017, par user1017674

    I have a couple videos that are usually around 2-4 minutes long.

    Now, I wish to mute my video for 5 seconds for every 10 seconds of video.

    Note that I basically would like to mute the audio during that 5 seconds every 10 seconds, no extra concatenation or processing of video is required.

    Can I accomplish this with ffmpeg ? What should the command be ?

    THanks

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