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• How do I add a text for the 1st 30 seconds inside a filter_complex expression for each video part ?

  30 décembre 2022, par PirateApp

  I am generating a video grid using the following filter_complex command

  


  ffmpeg
     -i v_nimble_guardian.mkv -i macko_nimble_guardian.mkv -i ghost_nimble_guardian_1.mp4 -i nano_nimble_guardian.mkv
     -filter_complex "
         nullsrc=size=3840x2160 [base];
         [0:v] trim=start=39.117000,setpts=PTS-STARTPTS, scale=1920x1080 [upperleft];
         [1:v] trim=start=40.483000,setpts=PTS-STARTPTS, scale=1920x1080 [upperright];
         [2:v] trim=start=32.416471,setpts=PTS-STARTPTS, scale=1920x1080 [lowerleft];
         [3:v] trim=start=28.100000,setpts=PTS-STARTPTS, scale=1920x1080 [lowerright];
         [3:a] atrim=start=28.100000,asetpts=PTS-STARTPTS[outa];
         [base][upperleft] overlay=shortest=1 [tmp1];
         [tmp1][upperright] overlay=shortest=1:x=1920 [tmp2];
         [tmp2][lowerleft] overlay=shortest=1:y=1080 [tmp3];
         [tmp3][lowerright] overlay=shortest=1:x=1920:y=1080[v]
     "
     -map "[v]" -map "[outa]" -c:v libx264 -crf 17 -shortest -t 880 output4k.mkv


  


  How do I text to this video grid that will appear with a fade in at 10 seconds, stay for 30 seconds and then fade out ?

  


  

  


  What I tried ?

  


  ffmpeg
     -i v.mkv -i macko_nimble_guardian.mkv -i ghost_nimble_guardian_subtle_arrow_1.mp4 -i nano_nimble_guardian.mkv
     -filter_complex "
         nullsrc=size=1920x1080 [base];
         drawtext=text='Summer Video':enable='between(t,10,30)'[fg];
         [0:v] trim=start=39.117000,setpts=PTS-STARTPTS, scale=960x540 [upperleft];
         [1:v] trim=start=40.483000,setpts=PTS-STARTPTS, scale=960x540 [upperright];
         [2:v] trim=start=32.416471,setpts=PTS-STARTPTS, scale=960x540 [lowerleft];
         [3:v] trim=start=28.100000,setpts=PTS-STARTPTS, scale=960x540 [lowerright];
         [3:a] atrim=start=28.100000,asetpts=PTS-STARTPTS[outa];
         [base][upperleft] overlay=shortest=1 [tmp1];
         [tmp1][upperright] overlay=shortest=1:x=960 [tmp2];
         [tmp2][lowerleft] overlay=shortest=1:y=540 [tmp3];
         [tmp3][lowerright] overlay=shortest=1:x=960:y=540[v]
     "
     -map "[v]" -map "[outa]" -c:v libx264 -shortest -t '30' output2.mkv


  


  It gives me an error

  


  [Parsed_drawtext_1 @ 0x600002bdc420] Using "/System/Library/Fonts/Supplemental/Verdana.ttf"
Filter drawtext:default has an unconnected output


  


• 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...

  


• Revision 16738 : Patch by Chris Pearce to tweak indexing in ffmpeg2theora to make it more ...

  27 novembre 2009, par j — Log

  Patch by Chris Pearce to tweak indexing in ffmpeg2theora to make it more accurate. Fixes : 1. Use ogg_int64_t to calculate and store presentation times of frames, rather than transitioning through double just to cast back to ogg_int64_t. Prevents floating point rounding errors from making frames (...)