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• How can you run an exe as with no window, in the background and being the most efficient use of resources ? [closed]

  18 mars 2013, par Covenant Spokane

  I don't understand the way the windows totally functions so forgive the novice question.

  I want to setup a server running a video processing peogram called FFMpeg. The server will be used at an time to run that command line program in as many instances that the server can handle. I don't want the server to have 100 command windows open while its processing. Can an exe be run as a process or service or something so that it runs without a window and is as efficient as possible.

• Error loading FFmpeg : ReferenceError : SharedArrayBuffer is not defined - Angular 18.2.3

  9 septembre 2024, par Memariya Chirag

  Question :

  


  I am working on an Angular project (version 18.2.3) where I use ffmpeg.wasm to trim videos and extract frames. However, when trying to load FFmpeg, I am encountering the following error in the console :

  


  Error loading FFmpeg: ReferenceError: SharedArrayBuffer is not definedenter image description here


  


  Below is the code that initializes FFmpeg and attempts to load it: 


  


  export class VideoEditorComponent implements OnInit {&#xA;  ffmpeg = createFFmpeg({ log: true });&#xA;  isPlaying = false;&#xA;  frameDataArray: Uint8Array[] = [];&#xA;  frameIndex = 0;&#xA;&#xA;  async trimAndExtractFrames(): Promise<void> {&#xA;    try {&#xA;      // Load FFmpeg&#xA;      await this.ffmpeg.load();&#xA;      console.log("FFmpeg loaded successfully");&#xA;    } catch (error) {&#xA;      console.error("Error loading FFmpeg:", error);&#xA;    }&#xA;  }&#xA;}&#xA;</void>

  


  I have tried to troubleshoot the issue but am unsure how to proceed.

  


  The error seems related to SharedArrayBuffer, which I understand is required for performance improvements in multi-threading for web applications.

  


  I have checked my ffmpeg.wasm setup, and it works fine in a plain JavaScript application.

  


  Ensured that my Angular application is correctly serving the WebAssembly files.

  


  Looked into setting up the appropriate HTTP headers for Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy, but I am unsure if I have done it correctly.

  


  My questions :

  


  

  • How do I resolve the SharedArrayBuffer is not defined error in Angular ?

  


  • Is there a specific setup required for using SharedArrayBuffer in Angular with WebAssembly applications like FFmpeg ?

  


  • How can I ensure that the necessary HTTP headers are configured correctly in my Angular project to support this ?

  


  


  Additional information :

  


  

  • Angular version : 18.2.3

  


  • ffmpeg.wasm version : Latest (installed via npm)

  


  • Browser : Chrome 100+

  


  


• Serving a single JPEG using ffserver

  4 mai 2016, par Magnus

  I have a setup where a local application writes a sequence of JPEG images into a FIFO (Unix named pipe on Linux). On the other end I have ffmpeg picking up the sequence and passing it into an instance of ffserver :

  % ffmpeg -i fifo.mjpeg http://127.0.0.1:8090/feed.ffm

  The configuration for ffserver looks like this :

  HTTPPort 8090
  
  HTTPBindAddress 0.0.0.0
  
  MaxHTTPConnections 20
  
  MaxClients 10
  
  MaxBandwidth 1000
  
  
  
  <feed>
  
    File /tmp/feed.ffm
  
    FileMaxSize 200k
  
  
  
    ACL allow 127.0.0.1
  
  </feed>
  
  
  
  <stream>
  
    Format mpjpeg
  
    Feed feed.ffm
  
  
  
    VideoSize 960x600
  
    VideoFrameRate 2
  
    VideoIntraOnly
  
    Strict -1
  
  
  
    NoAudio
  
    NoDefaults
  
  </stream>

  This works fine, I can point my web browser to http://127.0.0.1:8090/stream.mpjpeg and see the video.

  Now I want to add a way to download a single JPEG (I think of it as snapshot of the video). I added the following to the ffserver configuration :

  <stream>
  
    Format singlejpeg
  
    Feed feed.ffm
  
  
  
    VideoSize 960x600
  
    VideoFrameRate 2
  
    VideoIntraOnly
  
    Strict -1
  
  
  
    NoAudio
  
    NoDefaults
  
  </stream>

  That only sort of works. Sure, if I point my browser to http://127.0.0.1:8090/image.jpg I do so a still picture from the video, but the browser never stops loading !

  Indeed, if I run wget http://127.0.0.1:8090/image.jpg I see that the MIME type is good (image/jpeg), but there seems to be no end to the image.

  Am I missing something in my configuration that makes ffserver sending more than a single image ?

  I should add I’ve tried this setup on both 2.8.6 (Debian Jessie, package comes from jessie-backports) and 3.0 (Arch Linux), with the same result in both cases.