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• FFMPEG crop a portrait image square with respect to the zoomed dimensions and x/y pan

  3 octobre 2022, par hugger

  I am making a photo crop component for my mobile app.

  


  If an image is selected from the image picker and it is above 4:5 ratio, using FFMPEG I need to crop this image 1:1 using the dynamic X/Y values along with the scale value from pinching (1.00 - 10).

  


  I trying to use these values with the FFMPEG crop/scale filter, but no matter what I try I cant seem to get the crop to work as expected... It is not matching up from the UI pan / zoom.

  


  My FFMPEG command looks like this, along with some other relevant variable code :

  


  let zoom = this._scale.__getValue(); //set dynamically by the user; ranges from 0.1 to 10
let translateY = this._translateX.__getValue(); //amount from left side
let translateX = this._translateY.__getValue(); // amount from top

//trying to first crop the width and height / the zoom for the zoom scaling..?
//then I am using translate X/Y to get my coordinates (not matching up)
//I tried to use translateXY * zoom to get the scaling factor but it still did not work...
//the image needs to be square, chain scale filter to make this happen after the original crop?)
FFmpegKit.execute(
  `-y -i ${this.state.mediaSource} -vf "crop=iw/${zoom}:ih/${zoom}:${translateX}:${translateY}, scale=iw:iw:0:0" -qscale 0 -frames:v 1 ${filterPathPostCrop}`
).then(async (session) => {
  const returnCode = await session.getReturnCode();
  if (ReturnCode.isSuccess(returnCode)) {
    this.setState({
      mediaSource: filterPathPostCrop,
      videoSourcePreview: `${filterPathPostCrop}?${new Date().getTime()}`,
      ffMPEGinProgress: null,
      aspectRatio: 1080 / 1080,
      videoTime: 0,
      isPlayingVideo: false,
      isCropping: false,
      filterOutputIsAlt: !this.state.filterOutputIsAlt,
      wasCropped: true,
    });
  } else if (ReturnCode.isCancel(returnCode)) {
    // CANCEL
  } else {
    // ERROR
    alert('error');
  }
});


  


  I appreciate any guidance I can get with this, I feel like I am close I just cant seem to get this calculation working...

  


• ffmpeg fade in animation and logo overlay in a single step

  24 octobre 2018, par Amin Baig

  I have the following commands to create a fade in effect with a series of images and then place a water mark png using the lut filter on the generated video :

  //Creating the fade in video :

  ffmpeg -t 5 -i 1.jpg -t 5 -i 2.jpg -t 5 -i 3.jpg -t 5 -i 4.jpg -i 5.jpg -filter_complex "[0:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=out:st=4:d=1[v0];[1:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v1];[2:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v2];[3:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v3];[4:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v4];[v0][v1][v2][v3][v4]concat=n=5:v=1:a=0,format=yuva444p[v]" -map "[v]" -s "480x600" -t 40 series_out_fade_v2_5images.mp4

  After the video is created I use the following command to place a water mark logo over it :

  //Water mark

  ffmpeg -y -i series_out_fade_v2_5images.mp4 -i optimaken_logo.png -filter_complex "[1]lut=a=val*0.5[a];[0][a]overlay=0:0" -c:v libx264 -an v4_output.mp4

  my questions are :

  1. How can I achieve both in a single command
     2. How do I scale overlay proportionally so that the height of the water mark is always 65 pixels and the width is scaled
        proportionally
     3. Explicitly tell where to place the logo to the top right corner with a padding of 10 pixels for both x and y

• Heroku ffmpeg buildpack

  20 octobre 2015, par Manuel Quintanilla

  Putting together the video upload section in my rails app and am having some issues with video play on mobile phones. Im using

  paperclip-av-transcoder, s3 and  Heroku

  On my laptop I can visit the page and see the video thumbnails and play the videos only because I have previously installed ffmpeg to my machine.

  Remotely on Heroku I’ve set the appropriate buildpacks for ffmpeg and have run push heroku master to install the buildpacks - Now when I visit the page on my mobile iPhone I don’t get a thumbnail but when I play the video it plays - on the other hand when I visit the page on my Android phone I don’t get a thumbnail and the video dose not play but I can upload mp4s on Android.

  Check out my set up here : Heroku ffmpeg buildpacks for video uploads

  It seems I don’t have the proper buildpack setup or some other heroku setting with ffmpeg.

  Any suggestions ? Thanks in advance !