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• FFMPEG animation with multiple images

  7 octobre 2015, par user1402732

  I am using ffmpeg command line tool for creating video by mixing images & audio files. Everything is working as expected. Problem started when I need to add some animation to the images when creating videos. i.e. adding zoom in effect to multiple images, it has filters but none of seems to be working with multiple inputs but only for single input.

  Works fine :

  ffmpeg -loop 1 -i Winter.jpg -vf "zoompan=z='min(zoom+0.0015,1.5)':d=125" \
  
  -c:v libx264  -t 5 -s "800x450" zoomin1.mp4

  But this does not :

  ffmpeg -loop 1 -framerate 1 -i bg2.jpg -framerate 1/3 -i img%03d.jpg -i audio.mp3 \
  
  -filter_complex overlay=(W-w)/2:(H-h)/2:shortest=1,format=yuv420p,zoompan=z='zoom+0.095':d=3 \
  
  -c:v libx264 -r 30 -c:a aac -strict experimental -b:a 192k -movflags +faststart \
  
  -shortest testvideo.mp4

  It’s with multiple image and background image & audio.

  It zooms but transition is not smooth and also there’s a gap between images. It should go smoothly one after another.

• In ffmpeg how to keep text same location while filtering like zooming ?

  12 juillet 2019, par No_0n3

  In ffmpeg how do I keep the text in the same location while filtering ? e.g. zooming

  FFmpeg for linux

  ffmpeg 
  
  -t 5 
  
  -i x.jpg -filter_complex "[0:v]drawtext=fontfile='ariblk.ttf':text='test text':fontsize=24:x=0.23333333333333*main_w: y=0.1325*main_h:fontcolor=#000000: alpha=1,zoompan=z='if(lte(zoom,1.0),1.5,max(1.001,zoom-0.0015))':d=125,fade=t=out:st=4:d=1[v0]; [v0]concat=n=1:v=1:a=0,format=yuv420p[v]" 
  
  -map "[v]" 
  
  -s "800x450" 
  
  -t 40 ./video.mp4

  The text is zoomed in as well but I want it to keep the same size.

• Is there any memory problem that "Too many active WebGL contents." keeps coming out in my web console

  18 novembre 2022, par jerry

  

  


  Now I'm using RTSP stream with jsmpeg, ffmpeg, node-rtsp-stream in React.js

  


  I set multiple streaming in react component about 1 to maximum 25

  


  and when I change route to many , It apeard my console

  


  I'm a little afraid of if it caused by memory leak problem

  


  I cannot figure out it is okay or critical problem

  


  Could you tell me how to solve this problem or is it fine

  


  &#xA;// out of component&#xA;const streams: Streams = {};&#xA;&#xA;...&#xA;&#xA;  const { preset } = props;&#xA;&#xA;  const elementsRef = useRef<any>(new Array(preset?.partition).fill(0).map((v) => createRef()));&#xA;&#xA;&#xA;  // Mount&#xA;  useEffect(() => {&#xA;    const { JSMpeg } = window;&#xA;&#xA;    const sortedStream = _.sortBy(preset?.stream, ["position"]);&#xA;    console.log(sortedStream);&#xA;&#xA;&#xA;    sortedStream.forEach((v, i: number) => {&#xA;&#xA;      const player = new JSMpeg.Player(v.camera_monitoring.ws, {&#xA;        canvas: elementsRef?.current[v.position]?.current, // Canvas should be a canvas DOM element&#xA;      });&#xA;      console.dir(elementsRef?.current[v.position]?.current);&#xA;&#xA;      streams[v.id] = player;&#xA;    });&#xA;  }, []);&#xA;&#xA;  // UnMount&#xA;  useEffect(() => {&#xA;    return () => {&#xA;      Object.keys(streams).forEach((v) => {&#xA;        console.log("unmount key:", v);&#xA;        if (streams[v] !== null) {&#xA;          streams[v].destroy();&#xA;          streams[v] = null;&#xA;        }&#xA;      });&#xA;    };&#xA;  }, []);&#xA;&#xA;&#xA;&#xA;... &#xA;</any>

  


  https://github.com/phoboslab/jsmpeg

  


  above library `jsmpeg.min.js` is set by global ( in public directory and set in my html )

  


  actually my code are so many antipattern in contrast react style, To make an excuse, It is my limits of one's ability