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• Mencoder - Audio is longer than Video Stream

  30 juillet 2014, par Jasper

  I am trying use some images and audio to create video using mencoder.
  But my audio file could be much longer.

  Example:
  
  5 images. 
  
  fps: 1
  
  desired video length: 5 seconds
  
  audio file length is: 20 seconds.
  
  
  
  mencoder mf://*.jpg -mf fps:1.0 -oac mp3lame -audiofile myaudio.mp3 -ovc lavc vcodec=mpeg4 -o myvideo.mpeg

  This produces a video that is :
  20 seconds long (as long as audio file length).
  The image slide show ends at 5 seconds, after that there is only audio playing (from 6th to 20th second).

  How can i make mencoder to generate video of only duration where video stream exists. In this case end the video at 5 seconds.

  ffmpeg has a -shortest option for exactly this kind of use case. But i cannot find equivalent of that in mencoder.

• Node.JS Live Streaming Audio with FFMPEG

  20 avril 2021, par nicnacnic

  I'm trying to create an Express server to live stream audio captured from another application (Discord in this case). I'm able to get a server up and running, but there are a couple issues that need to be solved. Here's my server code so far.

  


  const app = express();
app.get("/", function(req, res) {
    res.sendFile(__dirname + "/index.html");
});
app.get("/audio", function(req, res) {
    const stream = ffmpeg(audio).inputOptions(["-f", "s16le", "-ar", "48k", "-ac", "2"]).format('wav');
    res.writeHead(200, { "Content-Type": "audio/wav" });
    stream.pipe(res);
});
app.listen(8080)


  


  

  1. Silent sections of audio need to be added. When there's no activity on the input, there's no data written to the audio variable. This causes weird behavior, for example I can speak and the audio comes through a second later. Then, if I wait 10 seconds then speak again, the audio comes through 4-5 seconds later. I believe this is a problem with the way I'm using ffmpeg to transcode, but I have no idea how to fix it.

  


  2. Refreshing the client crashes the program. Every time I refresh the client I get an ffmpeg error. Error: Output stream closed. This error doesn't happen if I close it, only on reload.

  


  3. The audio is not synced between clients. Every time I open a new connection, the audio starts playing from the beginning instead of being synced with each other and playing the audio live.

  


  


  This is how it's supposed to work : it captures audio from my app in PCM, converts the audio to WAV with ffmpeg, and then streams the audio live to the clients. The audio needs to be synced with all the clients as best as possible to reduce delay. And I'm using fluent-ffmpeg instead of just regular ffmpeg for the transcoding.
Thanks !

  


• Evolution #3961 (Fermé) : ne choisir qu’un seul document quand on fait "changer" un fichier

  19 juin 2017, par b b

  Super, merci, on ferme :)