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  • 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 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 ?

    


  • ffmpeg terminates without any output

    11 septembre 2012, par Khan

    I am using ffmpeg to convert a video file to mp4. here is my code

        echo "converting ".basename($src)." --- to --- ".basename($dest).".mp4...<br />";
    
$command = FFMPEG.&#39; -i &#39; . $src . &#39; -sameq -strict -2 -vcodec libx264 -ar 22050 -y &#39; . $dest.&#39;.mp4 2>&amp;1&#39;;   //
    
echo $command.&#39;<br />&#39;;
    

    
exec($command,$output,$status);
    
echo &#39;<pre>&#39;,join(&#39;<br />&#39;,$output),&#39;</pre><br />&#39;;
    

    
if($status == 0) {              // Success
    
    echo &#39;Successfully converted to MP4!<br />&#39;;
    
} else {
    
    echo $status."<br />failed<br />";
    
}

    The code works fine on my localhost (Windows 7 + wamp).. But on live server , only $command is echoed.. and script is terminated. The output file is generated but it is only 4.5MB (it should be around 17 MB) and not complete... and sometime I get the following output..

        ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers  built on Sep 10 2012 00:38:24 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)  configuration: --prefix=/home/one01qsc/local --extra-cflags=&#39;-L/home/one01qsc/local/lib/ -I /home/one01qsc/local/include/&#39; --extra-ldflags=&#39;-L/home/one01qsc/local/lib/ -Wl,-rpath,/home/one01qsc/local/lib/&#39; --enable-libmp3lame --enable-libvorbis --enable-shared --disable-yasm --enable-libtheora --enable-libx264 --enable-gpl
    
  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
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from &#39;/home/one01qsc/public_html/temp/pending/1455-testing-mobidick.mov&#39;:
    
  Metadata:
    
    major_brand     : qt
    
    minor_version   : 537199360
    
    compatible_brands: qt
    
    creation_time   : 2012-09-08 16:00:41
    
  Duration: 00:00:23.13, start: 0.490000, bitrate: 6028 kb/s
    
    Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 5331 kb/s, 29.97 fps, 29.97 tbr, 60k tbn, 59.94 tbc
    
    Metadata:
    
      creation_time   : 2012-09-08 16:00:41
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:1: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 192 kb/s
    
    Metadata:
    
      creation_time   : 2012-09-08 16:00:41
    
      handler_name    : Apple Alias Data Handler
    
[buffer @ 0x2405ce0] w:1920 h:1080 pixfmt:yuv420p tb:1/60000 sar:0/1 sws_param:flags=2
    
[buffersink @ 0x2429ec0] No opaque field provided
    
[aformat @ 0x23fa560] auto-inserting filter &#39;auto-inserted resampler 0&#39; between the filter &#39;src&#39; and the filter &#39;aformat&#39;
    
[aresample @ 0x2402e60] chl:stereo fmt:s16 r:44100Hz -> chl:stereo fmt:flt r:22050Hz
    
[libx264 @ 0x24288e0] using cpu capabilities: none!
    
[libx264 @ 0x24288e0] profile High, level 4.0
    
[libx264 @ 0x24288e0] 264 - core 128 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - 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=24 lookahead_threads=4 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 &#39;/home/one01qsc/public_html/temp/1455-testing-mobidick.mp4&#39;:
    
  Metadata:
    
    major_brand     : qt
    
    minor_version   : 537199360
    
    compatible_brands: qt
    
    creation_time   : 2012-09-08 16:00:41
    
    encoder         : Lavf54.6.100
    
    Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 1920x1080, q=-1--1, 30k tbn, 29.97 tbc
    
    Metadata:
    
      creation_time   : 2012-09-08 16:00:41
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:1: Audio: aac (@[0][0][0] / 0x0040), 22050 Hz, stereo, flt, 128 kb/s
    
    Metadata:
    
      creation_time   : 2012-09-08 16:00:41
    
      handler_name    : Apple Alias Data Handler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 -> libx264)
    
  Stream #0:1 -> #0:1 (aac -> aac)
    
Press [q] to stop, [?] for help
    
frame=   18 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s

    the value printed for $status is 137 in this case.

    Any help is really appreciated.

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