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• How to change size of watermark image and set Size and Aspect Ratio of Video using fluent-ffmpeg ?

  12 avril 2021, par Kirasiris

  Does anyone knows how to change the size of the watermark image ? ; secondly I tried to use complexFilter() with the size() and aspect() methods but it throws an error of complex-filter can not be used with complexFiltergraph in the same input stream ?

  


  This is my code :

  


  await ffmpeg('tmp/' + file.name)
  .input(waterMarkImage)
  .videoFilter([
    'overlay=10:10',
    'scale=1280:720',
    'aspect=16:9',
    'crop=1280:554:0:90',
  ])
  .output(key)
  .on('progress', function (progress) {
    console.log('Processing: ' + progress.percent + '% done')
  })
  .on('end', function (stdout, stderr) {
    console.log('Finished')
    fs.unlink(dir + file.name, function (err) {
      if (err) throw err
      console.log('File deleted')
    })
  })
  .on('error', function (err) {
    console.log('an error happened: ' + err.message)
    fs.unlink(dir + file.name, function (err) {
      if (err) throw err
      console.log('File deleted')
    })
  })
  .save(dir + key)


  


  Thanks.

  


• FFMpeg : scale down videos with maximum width and height while maintaining aspect ratio

  20 février 2021, par R3D34THR4Y

  In my program the user can input any video file he wants and have it transcoded ready for social media no matter its dimensions and aspect ratio.
The "export profiles" have many variables but the important ones here are maxheight and maxwidth.

  


  The FFMpeg filters must output a video that follows the following rules :

  


  

  • If the video is vertical, permutate the maxheight and maxwidth values (social media considers both 1280x720 and 720x1280 as "720P")

  


  • The video must not have a height superior to maxheight or a width superior to maxwidth.

  


  • The original video and exported video have the same aspect ratio and no distortion occurs.

  


  • No padding or cropping should occur.

  


  • The video should not be scaled if it is already under those maximum dimensions (no upscaling).

  


  • The function must work even with odd input resolutions.

  


  


  I have tried finding a combination of filters that do that but I haven't been able so far, either the video gets distorted or it gets huge black bars if the aspect ratio isn't right, the solution may be simple but I'm a beginner on this library so I'm probably just missing an easy solution.

  


  My current solution :

  


  ffmpeg -i input.mp4 -vf [in] scale=1280:720:flags=lanczos:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1 [res]; [res] format=yuv420p [format] -c:v libx264 -c:a aac -movflags +faststart output.mp4


  


  Thanks for reading

  


• How to change mp4 aspect ratio to 16:9 using ffmpeg ?

  20 février 2023, par user1788736

  I got an mp4 video that I copy 4 minute of it using ffmpeg. After uploading to YouTube I noticed the uploaded video has black bars on both side of video(right and left side) !After searching for a way to remove those black bars I found that I need to use yt:stretch=16:9 !However,using yt:stretch=16.9 tag will not remove the black bars on iPhone and Samsung smart tv YouTube app !

  



  could an expert help me change the aspect ratio of original mp4 video to 16:9 using ffmpeg (without losing video quality) for re uploading to YouTube ? Thanks in advance ?

  



  I got two types of source with following information :

  



  1)Resolution:720x576 ,Frame rate:25 . Codec:H264 - MPEG-4 AVC(part 10)(avc1),
2)Resolution:848x480 , Frame rate:24.804393,Codec:H264 - MPEG-4 AVC(part 10)(avc1)


  



  ffmpeg code used to trim the original video :

  



     ffmpeg -i orginalVideo.mp4 -ss 00:25:55 -t 00:04:02 -acodec copy -vcodec copy videoForYoutube.mp4