Recherche avancée

Sur d’autres sites (4783)

• FFMPEG mixing .wav files volume control [closed]

  1er avril 2024, par JoonSeo Yang

  I am working on Java, using the ffmpeg library with command line processing to mix 2 .wav files into one .wav file, but I would like to know how to control the volume of each original file.

  


  My problem : i have 2 audio files (human voice BGM), but BGM is too loud, so i can barely hear human voice, i would like to -> volume down the BGM file, or volume up voice file

  


  Here is my partial code

  


  String ffmpegCommand = file_exe.getAbsolutePath()
    + String.format(
        " -i %s -i %s -filter_complex amix=inputs=2:duration=first:dropout_transition=3 %s",
        file_1.getAbsolutePath(), file_2.getAbsolutePath(), outputFilePath);
Process process = Runtime.getRuntime().exec(ffmpegCommand);


  


  it is quite simple code. I need help on this, and it would be very thankful to which document to read to get such information

  


  PS.sorry for my poor eng.. Im not native :D

  


  I was wandering around documentations, but its quite hard to find what i want

  


• Is there a way to control ffplay audio volume from command line and from key commands on Mac OSX ?

  20 avril 2023, par smartblonde

  We want to use ffplay to monitor live RTMP feeds. We have a script to open an instance of ffplay for each feed. We would like to control the initial volume of the video to be around 30 out of 100. We would also like to be able to raise or lower the volume via key commands during the stream. We are referring to this doc : http://ffmpeg.org/ffplay.html

  



  We've tried the main option -volume 30, to try and start the volume at 30/100. FFplay says unrecognized option when it sees -volume on the command line.

  



  Also, we've tried using 9 and 0 to lower or raise the volume once the player is up and playing the live RTMP feed. These key commands seem to have no effect on the player's volume.

  



  Are there other shell parameters, and other key commands, that are known to work on all builds/OS's for ffplay ? If not, why change these basic functions from release and O/S ato other release ? In any case what works on MacOSX ? Thank you !

  


• Using ffmpeg to merge two audio file and one video file with control volume ?

  23 juin 2021, par mdtuyen

  I want to use ffmpeg to merge 2 audio files with one video file to create one video file, but in audio file I want to control the volume level of each file.

  



  What should I do ?

  



  ffmpeg -i video.mp4 -i input1.mp3 -i input2.mp3
-filter_complex "[1]volume=0.5,pan=2c[a];[2]volume=0.7,pan=2c[b];[a][b]amix=duration=shortest"
-ac 2 -c:a libmp3lame -q:v 0 output.mp4