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• Deal with resolution changed while decoding ?

  30 juillet 2024, par TTGroup

  I'm using FFMPEG with C++ to read frames and decode them from RTSP Stream on IP Camera.

  


  Anything is ok, but while decoding, I try to change stream resolution config on IP Camera (ex : change from 1280x720 to 1920x1080).

  


  The result is av_read_frame() in while loop still read successful next frames (with new resolution) without error. So I can not detect that change to reinit buffer or reconnect stream to update other stream's information.

  


  av_read_frame() will read an AVPacket, If I can read resolution info in the AVPacket, then I can detect that change and reinit buffer. But I can't see any resolution info in AVPacket struct.

  


  How do I detect a resolution change while reading and decoding the stream ?

  


  ---

  


  I'm using many codecs as H264 and H265/H265+. This case happened with all 3 codecs above.

  


  In many cases, I also store the AVPacket for later playback, so there's no need for decode. I need to detect the resolution change immediately to be able to properly build header information to store on the HDD.

  


• how to convert video into multiple fames using FFMPEG ?

  6 août 2021, par Justin Lee

  New programmer here ! I'm trying to convert a video into multiple jpegs (24fps) using FFmpeg.wasm and store it into an array. Honestly, I'm not sure what I'm doing but here's what I've done so far. *I'm writing this in React.

  


  await ffmpeg.run(
  "-i", //? Input file
  `test.mp4`, //? name of = Input file
  "-vf", //? set filter
  "fps=24", //? set frame per sec
  "test-%04d.png" //? Output file
);

//* Read the result
const data = ffmpeg.FS("readFile", `test-0001.png`);


  


  I need to store them in an array so I can do something with it after.
How should I go about it ? Cheers !

  


  Update Manage to find a workaround.*
Not too sure why I can't save it in jpeg though.

  


  await ffmpeg.run(
      "-i", //? Input file
      `test.mp4`, //? name of = Input file
      "-vf", //? set filter
      "fps=24", //? set frame per sec
      "test-%05d.png" //? Output file
    );

    //* List entire directory
    const listDir = ffmpeg.FS("readdir", "/");

    //* Retain target files
    const fileData = (data) => {
      const arr = data.filter((fileName) => /^test-.*.png$/.test(fileName));
      return arr;
    };
    const targetFiles = fileData(listDir);


  


• Anomalie #4764 (Fermé) : Menu actions rapides des plugins non dist : comment intégrer les SVG san...

  24 juin 2021

  Merci @Marcimat. Testé avec succès.
  Cela résout le problème et permet d’avoir la cohabitation des icônes png et svg sur les plugins qui ont des bornes de compatibilité large.

  Je passe en résolu. Les autres remarques peuvent faire l’objet de ticket dédié.