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• input stream error _read() is not implemented : ffmpeg-fluent

  23 mai 2018, par Thomsheer Ahamed

  I have buffer object. I want to pass that buffer as readable stream to ffpmeg.

  var ffmpeg = require('fluent-ffmpeg');
  
      var ffmpegPath = require("ffmpeg-binaries").ffmpegPath()
  
      ffmpeg.setFfmpegPath(ffmpegPath);
  
      var command = new ffmpeg();
  
  
  
      command.input(my_buffer)
  
          .videoCodec('libx264')
  
          .size('520x?')
  
          .aspect('4:3')
  
          .inputFPS(8)
  
          .outputFPS(30)
  
          .output('new_video.mp4')
  
          .on('start', onStrat)
  
          .on('progress', onProgress)
  
          .on('end', onEnd)
  
          .on('error', onError)
  
          .run();

  If I pass buffer right away I will get "Error : Invalid input
  at FfmpegCommand.proto.mergeAdd.proto.addInput.proto.input"

  So I converted buffer into stream using

  function bufferToStream(buffer) {
  
      let Duplex = require('stream').Duplex;
  
      let stream = new Duplex();
  
      stream.push(new Buffer(buffer));
  
      stream.push(null);
  
      return stream;
  
  }
  
  var red = bufferToStream(finalResponse.file.buffer);

  and passed this steam to input

  command.input(red)

  Above Command throws "ffmpeg exited with code 1 : Error opening filters !" ;

  If I use my_buffer and save it in locally using fs.writeFile(’path’,my_buffer) and pass this path to input of ffmpeg then it works fine..

  But I dont want to store that file and then delete it after altering video.

  Can some one help me ?

  I Reffered this example

• Stream video content through Web API 2

  12 juin 2020, par FaNIX

  I'm in the process of working out what the best way is going to be to do the following :

  



  I have a bunch of CCTV footage files (MP4 files, ranging from 4MB-50MB in size), which I want to make available through a web portal. My first thought was to stream the file through Web API, so I found the link below :

  



  http://www.strathweb.com/2013/01/asynchronously-streaming-video-with-asp-net-web-api/

  



  After implementing a sample project, I realised that the example was based on Web API 1, and not Web API 2.1, which is what I'm using. After doing some more research, I got the code to compile with WebAPI 2.1. I then realised that if I want to do streaming I cannot use MP4 files, there is a fair amount of technical detail behind this, so here is the thread :

  



  Best approach to real time http streaming to HTML5 video client

  



  It seems for this to work I need to encode my MP4 files to something like WebM, but that is going to take too much time. Icecast (http://icecast.org/), which is a streaming server, but I haven't tried it out yet, again not sure if this is what I need to do.

  



  Now that I think of it, I actually don't need live streaming, I just need to allow the client to play the video file through their browser, perhaps using HTML5 video element ? The thing is, my application needs to work on IOS as well, so I reckon that means I cant even encode my MP4 to FLV and just use flash.

  



  All I really need is to have all my video clips as thumbnails on a web page, and if the client clicks on one, it begins to play ASAP, without having to download the entire file. Think of the "Watch Trailer" feature on imdb.com. Simply just play a video file, thats really what I want. I don't need LIVE streaming, which is what I think WebM is for ? Again, not sure.

  


• lavf/dnn : dump OpenVINO model input/output names to OVMdel struct.

  21 juillet 2022, par Ting Fu

  lavf/dnn : dump OpenVINO model input/output names to OVMdel struct.
  Dump all input/output names to OVModel struct. In case other funcs use
  
  them for reporting errors or locating issues.
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  

  • [DH] libavfilter/dnn/dnn_backend_openvino.c