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• ffmpeg crop with negative offset

  12 août 2020, par Ajouve

  I have a nodejs application which is cropping videos using ffmpeg

  


  From time to time I have an error because I am trying to crop out of the video, see attached image where the black is the video and in red the crop zone. My final video has to be a square.

  


  

  


  If I am replacing the negative offset with 0 the final result will not be a square.

  


  I just need to add a black background on the non-existing part

  


  This is my actual code

  


  const cropVideo = (buffer, width, height, x, y) => {

    const inputFile = tmp.fileSync();
    const outputFile = tmp.fileSync();

    fs.writeFileSync(inputFile.name, buffer);

    return new Promise((resolve, reject) => {
        ffmpeg(inputFile.name)
            .videoFilters(`crop=${width}:${height}:${x}:${y}`)
            .format('mp4')
            .on('error', reject)
            .on('end', () => resolve(fs.readFileSync(outputFile.name)))
            .save(outputFile.name);
    })
}


  


• How To Concatenate Two MP4 Videos With Different Aspect Ratios and Resolutions

  11 novembre 2017, par PortableDiag

  I am using ffmpeg to concatenate multiple MP4 videos, two at a time. The problem I am having is that the videos are often different resolutions and aspect ratios. One might come from a 480p webcam with a 1:1 aspect ratio and the other a brand new iPhone with 4k video and rectangular aspect ratio. Currently I must choose and set the aspect ratio manually and this results in one of the two videos becoming distorted, depending on the selected aspect ratio.

  How can I merge two videos so that the overall viewing field has a square aspect ratio but videos with a rectangular aspect ratio will be scaled to fit inside.

  I am using this command to merge the videos :

  ffmpeg -threads 1 -i '/518.mp4' -i '/516.mp4' -y -filter_complex "[0:v]scale=1080x1920,setpts=PTS-STARTPTS,setdar=0/1[v0];[1:v]scale=1080x1920,setpts=PTS-STARTPTS,setdar=0/1[v1];[v0][0:a][v1][1:a]concat=n=2:v=1:a=1" '/partial1.mp4'

  This is the result : https://www.dropbox.com/s/x1un7z1ljwr6tty/merged_newsort.mp4?dl=0

  Is it possible to apply a border to the rectangular video to give them a square aspect ratio ?

  How can I keep prevent distortion from occurring during the merge process ?

  Thanks in advance.

• Create screen shot from video dynamically without ffmpeg [on hold]

  3 décembre 2014, par hitesh

  I need to take screenshot from the video after uploading, I already tried ffmpeg but it seems wjile enabling ffmpeg in my Cent OS 6.5 server. (check here )

  So I am looking for other ways to do this, I will be using simple html file tag for getting the video file, then I will be uploading it in server.

  what are other ways than ffmpeg to create screen shot from video dynamically in php or JS.