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• ffmpeg moving text but only within Y limits

  28 décembre 2022, par Yoav Mor

  I need to add text to a video that will scroll from bottom to top ; I managed to do it with something similar to this :

  


  ffmpeg -i vid.mp4 -vf "drawtext=fontfile=tahoma.ttf:fontsize=20:fontcolor=green:x=(w-text_w)/2+20:y=if(lt(t\,2)\,480\,(h-400-(40*t))):textfile=scroll.txt:bordercolor=white:borderw=1" -c:v libx264 -y -preset ultrafast scrolling.mp4

  


  The original video is 960x540, so the text starts at position y=480 and, after 2 seconds, starts moving up.
That bit works fine, and the text "vanishes" at the top of the frame as it scrolls up.
What I need to achieve is for the text to scroll only within certain Y limits, imagine a virtual box around the text, so it scrolls up only from a certain Y position in the bottom (but not the very bottom) and disappears into a line on the top that isn't the top part of the frame.
Can that be achieved with ffmpeg ?

  


  EDIT : Maybe the trick here should be to put the text on top of a transparent video that's smaller in height, and then within the same command somehow merge this new video that has the text with the original video. Not sure how achieve that though.

  


• 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