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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...

  


• When I run `ffmpeg` in the background, how do I prevent `suspended (tty output)` ?

  4 novembre 2017, par Jim DeLaHunt

  I have a sh script which calls ffmpeg on several files. When I try to run this script in the background, redirecting output to a file, the job starts but then immediately suspends :

  % bin/mp3convert.sh path/a/b &> ~/tmp/log.txt &
  
  [1] 93352
  
  % 
  
  [1]  + suspended (tty output)  bin/mp3convert.sh path/a/b &> 

  If I try making the script continue in the background, it immediately suspends again :

  % jobs
  
  [1]  + suspended (tty output)  bin/mp3convert.sh path/a/b &> 
  
  % bg %1
  
  [1]  + continued  bin/mp3convert.sh path/a/b &> 
  
  % jobs
  
  [1]  + suspended (tty output)  bin/mp3convert.sh path/a/b &> 
  
  %

  I can make the script continue, by making it the foreground, but then my terminal is occupied until the script finishes. That means I don’t get the benefit of running the script in the background.

  % 
  
  [1]  + suspended (tty output)  bin/mp3convert.sh path/a/b &> 
  
  % fg %1
  
  [1]  + continued  bin/mp3convert.sh path/a/b &> 
  
  % # much time passes with no activity on terminal, then script finishes
  
  %

  How can I make the script run cleanly in the background ?

  A simplified version of my script is :

  #!/bin/sh
  
  # mp3convert.sh
  
  for f in "$1"/*.flac; do
  
      ffmpeg -i "$f" -c:v copy path/to/dest/"$(basename -s .flac "$f")".mp3
  
  done

  I am running on Mac OS X 10.11.6, with ffmpeg version 3.4 supplied by MacPorts.

  An apparently related question is why do I get “Suspended (tty output)” in one terminal but not in others ?. The answer there is to set the terminal state with stty -tostop. That didn’t help me ; I already had that state set.

• Revision f204a9a482 : Fixed OUTPUT_YUV_SRC behavior for VP8 By enabling the OUTPUT_YUV_SRC compiler f

  30 mai 2014, par Tim Kopp

  Changed Paths :
   Modify /vp8/encoder/onyx_if.c

  
  
  Fixed OUTPUT_YUV_SRC behavior for VP8

  By enabling the OUTPUT_YUV_SRC compiler flag, the encoder will write the raw
  input to bd.yuv.

  The functionality was mostly implemented, but in its previous state did not
  compile.

  Change-Id : Ia331ad0f4c6e6f9f51e8d42cd33ba8cc146b3dbf