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• MLT How to Mix several audio tracks to play simultaneously ?

  24 septembre 2017, par user2455079

  I need to make video from list of video files, only some of them has sound and for some videos i need to add external soundtrack and for ALL videos and also I need to add global music that fill fade out to low volume on some videos.

  melt
  
  1.mp4" -mix 7 -mixer luma
  
  "2 mute.mp4" -mix 7 -mixer luma  
  
  "4.mp4" -mix 7 -mixer luma 
  
  -audio-track "music.mp3" out=600 -transition mix in=0 out=600 a_track=0 b_track=1  -filter volume level="0=0;68=0;83=-21;160=-21;170=0;470=0;481=-21;500=-21;510=0"
  
  -audio-track -blank 481 "voiceover.mp3" -transition mix in=481  a_track=0 b_track=1 

  Everything works fine except when adding soundtrack to specified position (last string) it overwrites music.mp3 (previous string) so music is muted.
  Everything needs to be mixed...

  How to add several sound tracks so they will play simultaneously ?

• How to fix corrupt video caused by amix filter - FFMPEG

  22 octobre 2019, par EJL

  I am trying to put text and audio in a video using FFMPEG. It is weird because the output is corrupted and the video timeline stop counting the video time currently playing. And also, some portions of the video are missing and even freezing/hanging.

  I already tried to search for this including updating my computers OS (Centos 7). Also, updating, upgrading ffmpeg build in my unit but still no luck.

  I am generating the video using this command :

  ffmpeg -i input.mp4 \
  
  -i mouse_click.mp3 \
  
  -i typing.mp3 \
  
  -filter_complex "[0:v]drawbox=enable='between(t,84,87)':y=ih-ih/5:color=black@1.0:width=iw:height=72:t=max,drawbox=enable='between(t,97,102)':y=ih-ih/5:color=black@1.0:width=iw:height=72:t=max,drawbox=enable='between(t,100,101)':x=622:y=682:w=93:h=31:color=red,drawtext=enable='between(t,84,86)':fontfile=fonts/RobotoBoldCondensed.ttf:text='Enter "admin-pc"...':fontcolor=white:fontsize=24:x=50:y=h-h/5+20,drawtext=enable='between(t,98,99)':fontfile=fonts/RobotoBoldCondensed.ttf:text='Finding "Use express settings"...':fontcolor=white:fontsize=24:x=50:y=h-h/5+20,drawtext=enable='between(t,100,101)':fontfile=fonts/RobotoBoldCondensed.ttf:text='Text Found':fontcolor=white:fontsize=24:x=50:y=h-h/5+20[video];[1]adelay=102000|102000,volume=15dB[s1];[2]adelay=84000|84000,volume=15dB[s0];[s0][s1] amix=inputs=2:duration=first:dropout_transition=0,dynaudnorm [click_sound]" \
  
  -map "[video]" \
  
  -map "[click_sound]" \
  
  -pix_fmt yuv420p \
  
  -c:a mp3 output.mp4

  I tried to remove the audio script by removing these lines :

  [1]adelay=102000|102000,volume=15dB[s1] ;
  [2]adelay=84000|84000,volume=15dB[s0] ;
  [s0][s1] amix=inputs=2:duration=first:dropout_transition=0,dynaudnorm [click_sound]

  and removing the

  -map "[click_sound]"

  , the video is working fine and is not corrupted. I believe it is becuase of the amix filter or something else but I cannot figure it out.

  The output should be a working video.

  Any response will be appreciated. Thank you.

• Using ffmpeg, I'm trying to mute all 5.1 channels of audio for a period of time within a video

  1er novembre 2019, par cozmonaut

  I’m wanting to mute audio for a portion of a video clip while keeping the video exactly as it is.

  I came across this online.

  ffmpeg -i ~/Downloads/in.mov -vcodec copy -af "volume=enable='between(t,0,3)':volume=0" ~/Downloads/out2.mov

  Although it works, it converts the 5.1 audio to stereo. Isn’t it possible to mute the first 3 seconds of all 5.1 channels of audio, while keeping the 5.1 channels intact within the finished output video file ?

  Here are the specs on my video/audio clip :

  Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
  
  Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 192 kb/s
  
  Stream #0:2[0x102]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s

  Thank you.