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• Issues with merging multiple audio files recorded by RecordRTC

  29 juillet 2019, par user590723

  I have been playing with RecordRTC a little bit. The audio input seem to be correctly sent to the web servers and saved on the drive.

  var recorder = RecordRTC(stream, {
  
  recorderType: MediaStreamRecorder,
  
  type: 'audio',
  
  mimeType: 'audio/wav',
  
  timeSlice: 2000,
  
  ondataavailable: function (blob) {                    
  
  
  
      var fileObject = new File([blob],  fileIndex + '-capture.wav', {
  
          type: 'audio/wav'
  
      });
  
  
  
      var formData = new FormData();
  
  
  
      formData.append('blob', fileObject);                    
  
      formData.append('filename', fileObject.name);
  
  
  
      $.ajax({
  
          url: 'XXX',
  
          data: formData,
  
          cache: false,
  
          contentType: false,
  
          processData: false,
  
          type: 'POST',
  
          success: function (response) {
  
              console.log('saved');
  
          }
  
      });
  
  
  
      fileIndex++;
  
  }

  }) ;

  I tried using ffmpeg to merge all the files into one, however every single time ffmpeg is crashing during parsing the second file :

  "Invalid data found when processing input"

  The command I am running is :

  ffmpeg.exe -f concat -safe 0 -i mylist.txt -c copy output.wav

  I would really appreciate if anyone could shed some light on what I am missing here.

  Thanks,
  M

• http live streaming based on a m3u file

  23 mars 2018, par 3agelx45

  I have an account on a platform of streaming (legal !). This platform provide me with a m3u file, the content looks like follow :

  #EXTM3U
  
  #EXTINF:-1 tvg-id="" tvg-name="|| something ||" tvg-logo="" group-title="",|| CAT1 ||
  
  http://someurl.domain:1234/video1.ts
  
  #EXTINF:-1 tvg-id="" tvg-name="video2" tvg-logo="" group-title="CAT1 part 1",VIDEO1
  
  http://someurl.domain:1234/video2.ts
  
  #EXTINF:-1 tvg-id="" tvg-name="video2" tvg-logo="" group-title="CAT1 part 1",VIDEO2
  
  .
  
  .
  
  .
  
  etc

  This file works fine using vlc from home. but when I travel I use Hotels hotspots and some do block the connection to someurl.domain:1234.

  is it possible to stream the m3u file using a light http server (stream the file from server side and reroute result to http). The idea is run a small iptv server from home on my raspberry which will allow me to bypass the "censorship" faced with some hotspots.

  Thanks !

• ffmpeg v4l2 taking 100% cpu usage

  16 novembre 2022, par didentifier

  I am on Fedora 37, version is irrelevant as I had same issue on Fedora 36.

  


  I am using the following command to send video from my usb video card to v4l2loopback and the CPU usage goes to 100% and I can't do much more on my computer (i5-8600k, nvidia 2060 rtx, 16GB ram).

  


  ffmpeg -nostdin -threads 1 -f video4linux2 -video_size 1920x1080 -input_format mjpeg -i /dev/video1 -f v4l2 -preset fast -c:v copy /dev/video0

  


  previously the command was like that and the rest of the arguments was added to see if it makes any difference, it seems it doesn't change much

  


  ffmpeg -f video4linux2 -video_size 1920x1080 -input_format mjpeg -i /dev/video1 -f v4l2 -c copy /dev/video0

  


  To be honest I don't know much about ffmpeg or video in general, I was using the same command a few months ago on the same hardware with almost 0 impact to my performance, I could play games and watch videos at the same time while now I get 15 FPS in my games while I am using ffmpeg. Did anything change in ffmpeg ? Any improvements to my ffmpeg command ? Shouldn't ffmpeg not encode anything if I am using pixelformat and frame rate supported by my usb video card and if that is true shouldn't be super light ?