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• ffmpeg : 1 image + 1 audio = 1 video (how can it encode faster ?)

  11 août 2013, par user1062949

  I want ffmpeg to take a png image and a mp3 audio file as input and generate a video file of the same duration as the audio file. I'm using the following command :

   ffmpeg -loop 1 -shortest -y -i image.png -i audio.mp3 -acodec copy \
  
   -vcodec libx264 video.mov

  However, given a 40min mp3 file (160kbps) as input, it is taking more than 2 hours to encode the whole video on a MacBook Pro i5 2.5GHz.

  I tried to use the -preset ultrafast option, but it is not really improving the encoding speed significantly.

  Is there any way to encode it faster using ffmpeg ?

  I was following the instructions provided in this post : ffmpeg : 1 image + 1 audio file = 1 video

  Any help will be appreciated, thank you.

• c# NReco.VideoConverter Ubuntu 16.04

  19 septembre 2018, par Neyt Chi

  I’m trying to use the functionality of the NReso library. VideoConverter. The program is launched from Ubuntu OS 16.04 in the MonoDevelopment environment. The operating system is 64 charging. I installed the application FFMpeg and it works fine.
  And I have a problem that does not make a lot of sense. I’m trying to use code NReso.VideoConveter from the site official site https://www.nrecosite.com/video_converter_net.aspx :

  try
  
  {
  
       string [] paths = {"1.mp4",
  
       "1.mp4",
  
       "1.mp4"};
  
       ConcatSettings concatSettings = new ConcatSettings ();
  
       concatSettings.ConcatAudioStream = false;
  
       concatSettings.ConcatVideoStream = true;
  
       FFMpegConverter ffMpegConvert = new FFMpegConverter ();
  
       Console.WriteLine ("Converting ... \ r \ n");
  
       ffMpegConvert.ConcatMedia (paths, "3.mp4", Format.mp4, concatSettings);
  
       Console.WriteLine ("Complete!");
  
  }
  
  catch (Exception e)
  
  {
  
  Console.WriteLine (e.Message);
  
  }

  The code produces an error of type

  "ApplicationName = ’/ home / neytchi / Projects / testVE / testVE /
  bin / Debug / ffmpeg.exe’, CommandLine = ’- y -loglevel info -i
  "1.mp4" -i "1.mp4" -i "1. mp4 "-f mp4 -filter_complex" concat = n = 3 :
  v = 1 [v] "-map" [v] "" 3.mp4 "’, CurrentDirectory =’ / home / neytchi
  / Projects / testVE / testVE / bin / Debug ’, Native error = Access
  denied" or so "Unhandled Exception : Systems
  .ComponentModel.Win32Exception"

  I can not understand the cause of problem, but I’m assuming that the library starts the process as 32-bit, when everything else is 64-bit.
  Any ideas ? Perhaps someone met with a similar on Ubuntu.

• Stream Stops Working Using FFMPEG Inside a Node Child_Process Spawn

  14 septembre 2020, par Brad Spencer

  I'm using a video stream on a raspberry pi with raspivid and ffmpeg in a node app. Using them in the terminal (without using node) will stream for hours, but when I use them in a node child_process (I spawn 2, one for each) it works great for a little over 3 minutes and then the stream stops. The child_processes are still running and I'm not seeing any errors.

  


  The gist of my code :

  


  let camera = spawn('raspivid', args)
let ffmpeg = spawn('ffmpeg', args)  

camera.stdout.on('data', (data) => {
  ffmpeg.stdin.write(data)
})


  


  Any ideas why it is stopping after 3 minutes ? Thanks !