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• typeError when using ffmpeg with buffer in NodeJS ["argument must be of type string or an instance of Buffer"]

  16 mars 2021, par coolps811

  I am trying to covert buffer data into the correct mp4 video format. However I am getting an error : "UnhandledPromiseRejectionWarning : TypeError [ERR_INVALID_ARG_TYPE] : The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of FfmpegCommand". How can I fix this ?

  


  router.post("/download", (req, res, next) => {
  axios({
    method: "get",
    url: req.body.url,
    responseType: "arraybuffer",
  }).then(function (response) {
    const data = new Uint8Array(Buffer.from(response.data));

    const proc = new ffmpeg(data)
      .videoCodec("libx264")
      .outputOptions(["-movflags isml+frag_keyframe"])
      .toFormat("mp4")
      //.seekInput(offset) this is a problem with piping
      .on("error", function (err, stdout, stderr) {
        console.log("an error happened: " + err.message);
        console.log("ffmpeg stdout: " + stdout);
        console.log("ffmpeg stderr: " + stderr);
      })
      .on("end", function () {
        console.log("Processing finished !");
      })
      .on("progress", function (progress) {
        console.log("Processing: " + progress.percent + "% done");
      });

    fs.writeFile("Assets/test.mp4", proc, callback);
  });

  const callback = (err) => {
    if (err) throw err;
    console.log("It's saved!");
  };
});


  


• OpenCV Installation error in ubunt, stuck on compilation [duplicate]

  11 novembre 2014, par Deepak Eevil Personified

  This question already has an answer here :

  • What is an undefined reference/unresolved external symbol error and how do I fix it ?
    
    14 answers
    

  When I try to install opencv in ubuntu 9.1 Karmic Koala,I know it is a older version. I encounter with the following error while compiling(Using Make)

  I have installed all the new versions of FFMPEG and other utilities, Still I am unable to install opencv

  [ 19%] Built target pch_Generate_opencv_perf_core
  
  
  
  Linking CXX executable ../../bin/opencv_perf_core
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_free'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_init'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_is_initialized'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_close'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_convert'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `swr_alloc'
  
  
  
  ../../lib/libopencv_highgui.so.2.4.9: undefined reference to `cvCreateCameraCapture_V4L(int)'
  
  
  
  collect2: ld returned 1 exit status
  
  
  
  make[2]: *** [bin/opencv_perf_core] Error 1
  
  
  
  make[1]: *** [modules/core/CMakeFiles/opencv_perf_core.dir/all] Error 2
  
  
  
  make: *** [all] Error 2

  If some body can help with this, it will be greatfull

  Thanks in advance

• Can not use the jsmpeg in react "Unexpected use of 'self'"

  5 mai 2020, par Muhammad Anas Khan

  code that i want to convert in React

  



   &#xA;    &#xA;    <code class="echappe-js">&lt;script type=&quot;text/javascript&quot; src='http://stackoverflow.com/feeds/tag/jsmpeg.min.js'&gt;&lt;/script&gt;&#xA;&#xA;    &lt;script type=&quot;text/javascript&quot;&gt;&amp;#xA;      var canvas = document.getElementById(&quot;videoCanvas&quot;);&amp;#xA;      console.log(document.location.hostname);&amp;#xA;     var url = &quot;ws://localhost:9999/&quot;;&amp;#xA;    &lt;/script&gt;&#xA;    &#xA;&#xA;

  



  Can not change it to react format.When i try to convert it is giving jsmpeg error 
i.e

  



  code that i tried but get an error

  



  import React from &#x27;react&#x27;;&#xA;import ReactDOM from &#x27;react-dom&#x27;;&#xA;import "./jsmpeg.min.js"&#xA;const App =()=>{&#xA;    return(&#xA;        <h1>Hello</h1>&#xA;    )&#xA;}&#xA;&#xA;&#xA;ReactDOM.render(<app></app>,document.getElementById(&#x27;root&#x27;));&#xA;

  



  Error

  



  /src/jsmpeg.min.js
Line 606:9 : Unexpected use of 'self' no-restricted-globals
 Line 2771:13 : Expected an assignment or function call and instead saw an expression no-unused-expressions

  



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