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• FFmpeg zoom not smooth-centered (but zigzag)

  10 juin 2016, par SebSob

  I try to perform a basic zoompan with FFmpeg. I have an input image (.png 1280x720) and i create an 8 seconds video (.mp4 320x180) from it, with a zoom. This is my command :

  ffmpeg -loop 1 -i in_img.png -c:v libx264 -pix_fmt yuv420p -strict experimental -framerate 25 -vf zoompan=z=’min(zoom+0.011835363,2.1835363)’:d=375:x=400:y=247 -s 320x180 -t 00:00:08.882 out_vid.mp4

  Everything works...but the zoom is not looking okay. It is going zig-zag.

  Does anyone know how to make it zoom smooth, like centered ? (And not first left then right)

  Thanks

  EDIT

  ---

  I’ve come a small step closer to a solution by slightly modifying the ’x’ and ’y’ in the -vf filter (rest of the command is the same as above) :

  -vf
  zoompan=z=’min(zoom+0.022,3.25)’:d=375:x=’if(gte(zoom,3.25),x,x+8.24)’:y=’if(gte(zoom,3.25),y,y+4.72)’:s=1280x720

  I incement x and y every frame (for x +8.24, for y +4.72, i know those values because i know how many frames it takes get to the end-zoom state) so that it will move to its end zoom state coordinate (1011,582), see image :

  
  This is the video of the result, as you can see it does not do the zig-zag effect, but now it looks like its going first to the center and then to the zoomed result. Or is that only an illusion ??
  Any idea’s ?

• Android ffmpeg usage - I want reduce the output apk file size - Iam Using only for image to webp conversion

  3 juin 2022, par Fazl Faisal

  FFMPEG - Android Only using for jpg to webp conversion. But the apk file size is very big.
I want know where rules want to change for reducing the APK file size. Please Help

  


      List<string> commandList = new LinkedList&lt;>();&#xA;    commandList.add("-i");&#xA;    commandList.add(imageFilePath);&#xA;    commandList.add("-vcodec");&#xA;    commandList.add("webp");&#xA;    commandList.add("-loop");&#xA;    commandList.add("0");&#xA;    commandList.add("-pix_fmt");&#xA;    commandList.add("yuv420p");&#xA;    commandList.add(outputPath);&#xA;&#xA;    String[] cropCommand  = commandList.toArray(new String[commandList.size()]);&#xA;&#xA;    FFmpegSession session = FFmpegKit.execute(cropCommand);&#xA;&#xA;    if (ReturnCode.isSuccess(session.getReturnCode())) {&#xA;&#xA;        fp.ToastDebug("Success");&#xA;&#xA;    } else if (ReturnCode.isCancel(session.getReturnCode())) {&#xA;&#xA;        fp.ToastDebug("CANCEL");&#xA;&#xA;    } else {&#xA;&#xA;        fp.AlertDebug("ffmpeg: "&#x2B; String.format("Command failed with state %s and rc %s.%s", session.getState(), session.getReturnCode(), session.getFailStackTrace()));&#xA;        fp.Log("ffmpeg: "&#x2B; String.format("Command failed with state %s and rc %s.%s", session.getState(), session.getReturnCode(), session.getFailStackTrace()));&#xA;&#xA;    }&#xA;</string>

  


• FFmpeg crop portrait video 1:1 from the top based on dynamic value

  8 avril 2022, par hugger

  I am replacing my video editing component with FFmpeg. So far it has been smooth until getting to this point where I need to crop my vertical (portrait) video to 1080x1080 with a dynamic value.

  


  Essentially, I built a custom component to do the cropping, where I can pan a square box over the video. the Y value for the pan is where I wish to cut the top part of the video.

  


  Here is the code I have tried, which works but is not cropping to my desired specs note : offsetDiff is the space I wish to remove from the top (pan px value) :

  


    cropSelected() {
    const diff =
      this.props.videoHeight / (this.state.aspectRatio * deviceWidth);
    const offsetDiff = this.state.offsetTopTranslate * diff;

    var path =
      this.props.type === 'photo'
        ? RNFS.DocumentDirectoryPath + '/after.png'
        : RNFS.DocumentDirectoryPath + '/after.mp4';

    var filterPath =
      this.props.type === 'photo'
        ? RNFS.DocumentDirectoryPath + '/afterFilter.png'
        : RNFS.DocumentDirectoryPath + '/afterFilter.mp4';

    FFmpegKit.execute(
      `-y -i ${path} -vf "crop=iw:1080:0:${offsetDiff}, scale=1080:1080" -qscale 0 ${filterPath}`,
    ).then(async session => {
      const returnCode = await session.getReturnCode();
      if (ReturnCode.isSuccess(returnCode)) {
        // SUCCESS
        this.setState({
          mediaSource:
            this.props.type === 'video'
              ? `file://${filterPath}?${new Date().getTime()}`
              : filterPath,
          isOpen: !this.state.isOpen,
          ffMPEGinProgress: null,
          aspectRatio: 1080 / 1080,
        });
      } else if (ReturnCode.isCancel(returnCode)) {
        // CANCEL
      } else {
        // ERROR
        alert('error');
      }
    });
  }


  


  Basically here I am trying to tell FFmpeg to keep the width (1080), make the height 1080, ignore X value, crop dynamic amount from the top.

  


  Here is what my cropper component looks like to get an idea.

  


  

  


  I appreciate any help I can get here folks, cheers !