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• Combining multiple pcm files with different starting times

  18 juillet 2021, par BelMat

  How do I combine multiples pcm files, with different starting times and compress it into wav with ffpmeg.js.

  


  I know I can :

  


  Transform pcm to wav

  


  ffmpeg -f s16le -ac 2 -ar 44.1k -i file.pcm file.wav


  


  Merge files with different starting times :

  


  ffmpeg -i 1.mp4 -i 2.mp4 -i 3.mp4 -i 4.mp3
  -filter_complex "[2]adelay=10000|10000[s2];[3:a][1:a][s2]amix=3[a]"
  -map 0:v -map "[a]" -c:v copy result.mp4


  


  but how would I combine all of this inside JS, plus getting the files with FS (Node) and the starting time from the file name ?

  


  This is a small snippet where I tried to do all of this :

  


  function MakeAudioFile(){
    const audios = fs.readdirSync('./sound/').filter(file => file.endsWith(".pcm"));
    let result = ffmpeg({
        MEMFS: [],
        arguments: ["-f", "s16le", "-ac", "2", "--ar", "44.1k"],
    });
    audios.forEach(file =>{
        result.arguments.push('-i')
        result.arguments.push(file)
        result.MEMFS.push(fs.readFileSync(`./sound/${file}.pcm`))
    })
}


  


  But didn't get the expected result and had no idea on how to also add the starting time

  


• How to add long text ffmpeg video

  13 février 2023, par Joe Cola

  I tried adding text in the middle of the video, but the results weren't what I wanted. namely long text out of line, how to make long text automatically into a new line below ?

  


  ffmpeg -i input.mp4 -vf "drawtext=fontfile=/path/to/font.ttf:text='I tried adding text in the middle of the video, but the results are not as desired,':fontcolor=white: fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2" -codec:a copy output.mp4

  


  i used that command, and the output like this

  


  output video

  


  Please help

  


  please help my problem

  


• ffmpeg combining live video from 3 cameras

  18 juillet 2022, par annr

  I have 3 USB cameras streaming video at a specific resolution. I am trying to merge the videos together as an hstack and display using ffplay.

  


  This is the command I am using :

  


  ffmpeg -f dshow -pix_fmt uyvy422 -video_size 1280x2160 -i video="CAM_0" -f dshow -pix_fmt uyvy422 -video_size 1280x2160 -i video="CAM_1" -f dshow -pix_fmt uyvy422 -video_size 1280x2160 -i video="CAM_2" -filter_complex hstack=3 -f nut - | ffplay -


  


  The USB Camera system will only start video stream only when 3 cameras are enabled (or started by ffmpeg). However when I am using the above command, ffmpeg starts CAM_0 and waits for data. As a result CAM_1 and CAM_2 are not started and video stream does not start.

  


  Is there any way where I can start all 3 inputs simultaneously using ffmpeg and then merge them together using hstack ?

  


  Thanks !