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  • adding silent audio in ffmpeg

    30 mars 2020, par jon

    I'm trying to use ffmpeg to add a silent audio track to a MOV file.

    



    I created a silent audio track longer than the video, and intend to use the -shortest option with ffmpeg.

    



    Using SoX v14.3.1, I run this to generate a wav file :

    



    sox -n -r 44100 -b 16 -c 2 -L silence.wav trim 0.0 60.000

# -n  = Sox's null file
# -r = sample rate 
# -b = bits per sample
# -c = num of channels
# -L = little endian
# filename
# trim - is an effect, args start and length.


    



    My basic ffmpeg command looks like this :

    



    ffmpeg -shortest \
-i silence.wav -acodec pcm_s16le \
-i vid_no_sound.mov -vcodec copy vid_with_sound.mov


    



    The result of this is :

    



    ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Aug 27 2012 13:11:25 with gcc 4.4.5
  configuration: --extra-cflags=-static --prefix=/root/ffmpeg_build/src/ffmpeg-0.11.1 --enable-bzlib --enable-gnutls --enable-libfreetype --enable-libmp3lame --enable-libdc1394 --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-openssl --enable-zlib --enable-gpl --enable-nonfree --enable-version3
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[wav @ 0x29ab2e0] max_analyze_duration 5000000 reached at 5015510
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, wav, from 'silence.wav':
  Duration: 00:01:00.00, bitrate: 1411 kb/s
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'vid_no_sound.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2012-07-25 13:41:44
  Duration: 00:00:14.50, start: 0.000000, bitrate: 27457 kb/s
    Stream #1:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 1920x1080, 27450 kb/s, SAR 1920:1920 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc
    Metadata:
      creation_time   : 2012-07-25 13:41:44
      handler_name    : Apple Alias Data Handler
    Stream #1:1(eng): Data: none (tmcd / 0x64636D74)
    Metadata:
      creation_time   : 2012-07-25 13:42:06
      handler_name    : Apple Alias Data Handler
      timecode        : 00:00:00:00
File 'vid_with_sound.mov' already exists. Overwrite ? [y/N] y
auto-inserting filter 'auto-inserted resampler 0' between the filter 'src' and the filter 'aformat'
[aresample @ 0x2ab3b00] chl:stereo fmt:s16 r:44100Hz -> chl:stereo fmt:flt r:44100Hz
[NULL @ 0x2994320] Codec is experimental but experimental codecs are not enabled, try -strict -2
Output #0, mov, to 'vid_with_sound.mov':
    Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 1920x1080 [SAR 1920:1920 DAR 16:9], q=2-31, 27450 kb/s, 24 fps, 90k tbn, 24 tbc
    Metadata:
      creation_time   : 2012-07-25 13:41:44
      handler_name    : Apple Alias Data Handler
    Stream #0:1: Audio: none, 44100 Hz, stereo, flt, 128 kb/s
Stream mapping:
  Stream #1:0 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (pcm_s16le -> aac)
Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height


    



    I have tried adding the -strict -2 as suggested, although I am not sure where to put it in the command line.

    



    I've spent two hours trying different things and reading ffmpeg documentation, but I'm still stuck.

    



    How do I add a silent audio track to a mov file ?

    


  • adding silent audio in ffmpeg

    10 février 2017, par jon

    I’m trying to use ffmpeg to add a silent audio track to a MOV file.

    I created a silent audio track longer than the video, and intend to use the -shortest option with ffmpeg.

    Using SoX v14.3.1, I run this to generate a wav file :

    sox -n -r 44100 -b 16 -c 2 -L silence.wav trim 0.0 60.000
    

    
# -n  = Sox's null file
    
# -r = sample rate 
    
# -b = bits per sample
    
# -c = num of channels
    
# -L = little endian
    
# filename
    
# trim - is an effect, args start and length.

    My basic ffmpeg command looks like this :

    ffmpeg -shortest \
    
-i silence.wav -acodec pcm_s16le \
    
-i vid_no_sound.mov -vcodec copy vid_with_sound.mov

    The result of this is :

    ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
    
  built on Aug 27 2012 13:11:25 with gcc 4.4.5
    
  configuration: --extra-cflags=-static --prefix=/root/ffmpeg_build/src/ffmpeg-0.11.1 --enable-bzlib --enable-gnutls --enable-libfreetype --enable-libmp3lame --enable-libdc1394 --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-openssl --enable-zlib --enable-gpl --enable-nonfree --enable-version3
    
  libavutil      51. 54.100 / 51. 54.100
    
  libavcodec     54. 23.100 / 54. 23.100
    
  libavformat    54.  6.100 / 54.  6.100
    
  libavdevice    54.  0.100 / 54.  0.100
    
  libavfilter     2. 77.100 /  2. 77.100
    
  libswscale      2.  1.100 /  2.  1.100
    
  libswresample   0. 15.100 /  0. 15.100
    
  libpostproc    52.  0.100 / 52.  0.100
    
[wav @ 0x29ab2e0] max_analyze_duration 5000000 reached at 5015510
    
Guessed Channel Layout for  Input Stream #0.0 : stereo
    
Input #0, wav, from 'silence.wav':
    
  Duration: 00:01:00.00, bitrate: 1411 kb/s
    
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
    
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'vid_no_sound.mov':
    
  Metadata:
    
    major_brand     : qt
    
    minor_version   : 537199360
    
    compatible_brands: qt
    
    creation_time   : 2012-07-25 13:41:44
    
  Duration: 00:00:14.50, start: 0.000000, bitrate: 27457 kb/s
    
    Stream #1:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 1920x1080, 27450 kb/s, SAR 1920:1920 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc
    
    Metadata:
    
      creation_time   : 2012-07-25 13:41:44
    
      handler_name    : Apple Alias Data Handler
    
    Stream #1:1(eng): Data: none (tmcd / 0x64636D74)
    
    Metadata:
    
      creation_time   : 2012-07-25 13:42:06
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:00:00:00
    
File 'vid_with_sound.mov' already exists. Overwrite ? [y/N] y
    
auto-inserting filter 'auto-inserted resampler 0' between the filter 'src' and the filter 'aformat'
    
[aresample @ 0x2ab3b00] chl:stereo fmt:s16 r:44100Hz -> chl:stereo fmt:flt r:44100Hz
    
[NULL @ 0x2994320] Codec is experimental but experimental codecs are not enabled, try -strict -2
    
Output #0, mov, to 'vid_with_sound.mov':
    
    Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 1920x1080 [SAR 1920:1920 DAR 16:9], q=2-31, 27450 kb/s, 24 fps, 90k tbn, 24 tbc
    
    Metadata:
    
      creation_time   : 2012-07-25 13:41:44
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:1: Audio: none, 44100 Hz, stereo, flt, 128 kb/s
    
Stream mapping:
    
  Stream #1:0 -> #0:0 (copy)
    
  Stream #0:0 -> #0:1 (pcm_s16le -> aac)
    
Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

    I have tried adding the -strict -2 as suggested, although I am not sure where to put it in the command line.

    I’ve spent two hours trying different things and reading ffmpeg documentation, but I’m still stuck.

    How do I add a silent audio track to a mov file ?

  • adding silent audio to mov in ffmpeg

    12 septembre 2016, par jon

    I’m trying to use ffmpeg to add a silent audio track to a MOV file.

    I created a silent audio track longer than the video, and intend to use the -shortest option with ffmpeg.

    Using SoX v14.3.1, I run this to generate a wav file :

    sox -n -r 44100 -b 16 -c 2 -L silence.wav trim 0.0 60.000
    

    
# -n  = Sox's null file
    
# -r = sample rate 
    
# -b = bits per sample
    
# -c = num of channels
    
# -L = little endian
    
# filename
    
# trim - is an effect, args start and length.

    My basic ffmpeg command looks like this :

    ffmpeg -shortest \
    
-i silence.wav -acodec pcm_s16le \
    
-i vid_no_sound.mov -vcodec copy vid_with_sound.mov

    The result of this is :

    ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
    
  built on Aug 27 2012 13:11:25 with gcc 4.4.5
    
  configuration: --extra-cflags=-static --prefix=/root/ffmpeg_build/src/ffmpeg-0.11.1 --enable-bzlib --enable-gnutls --enable-libfreetype --enable-libmp3lame --enable-libdc1394 --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-openssl --enable-zlib --enable-gpl --enable-nonfree --enable-version3
    
  libavutil      51. 54.100 / 51. 54.100
    
  libavcodec     54. 23.100 / 54. 23.100
    
  libavformat    54.  6.100 / 54.  6.100
    
  libavdevice    54.  0.100 / 54.  0.100
    
  libavfilter     2. 77.100 /  2. 77.100
    
  libswscale      2.  1.100 /  2.  1.100
    
  libswresample   0. 15.100 /  0. 15.100
    
  libpostproc    52.  0.100 / 52.  0.100
    
[wav @ 0x29ab2e0] max_analyze_duration 5000000 reached at 5015510
    
Guessed Channel Layout for  Input Stream #0.0 : stereo
    
Input #0, wav, from 'silence.wav':
    
  Duration: 00:01:00.00, bitrate: 1411 kb/s
    
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
    
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'vid_no_sound.mov':
    
  Metadata:
    
    major_brand     : qt
    
    minor_version   : 537199360
    
    compatible_brands: qt
    
    creation_time   : 2012-07-25 13:41:44
    
  Duration: 00:00:14.50, start: 0.000000, bitrate: 27457 kb/s
    
    Stream #1:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 1920x1080, 27450 kb/s, SAR 1920:1920 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc
    
    Metadata:
    
      creation_time   : 2012-07-25 13:41:44
    
      handler_name    : Apple Alias Data Handler
    
    Stream #1:1(eng): Data: none (tmcd / 0x64636D74)
    
    Metadata:
    
      creation_time   : 2012-07-25 13:42:06
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:00:00:00
    
File 'vid_with_sound.mov' already exists. Overwrite ? [y/N] y
    
auto-inserting filter 'auto-inserted resampler 0' between the filter 'src' and the filter 'aformat'
    
[aresample @ 0x2ab3b00] chl:stereo fmt:s16 r:44100Hz -> chl:stereo fmt:flt r:44100Hz
    
[NULL @ 0x2994320] Codec is experimental but experimental codecs are not enabled, try -strict -2
    
Output #0, mov, to 'vid_with_sound.mov':
    
    Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 1920x1080 [SAR 1920:1920 DAR 16:9], q=2-31, 27450 kb/s, 24 fps, 90k tbn, 24 tbc
    
    Metadata:
    
      creation_time   : 2012-07-25 13:41:44
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:1: Audio: none, 44100 Hz, stereo, flt, 128 kb/s
    
Stream mapping:
    
  Stream #1:0 -> #0:0 (copy)
    
  Stream #0:0 -> #0:1 (pcm_s16le -> aac)
    
Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

    I have tried adding the -strict -2 as suggested, although I am not sure where to put it in the command line.

    I’ve spent two hours trying different things and reading ffmpeg documentation, but I’m still stuck.

    How do I add a silent audio track to a mov file ?

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