Newest 'ffmpeg' Questions - Stack Overflow

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• How to stream Windows desktop audio as RTSP/HTTP with ffmpeg ?

  3 janvier 2019, par Valya

  I'd love to stream desktop audio so I could listen to it in AIMP Android app. The app understands "http" links and I could successfully stream it with VLC HTTP streaming, however I could not get latency lower than 3 seconds.

  How can I do the same thing with ffmpeg with lowest latency possible?

• Where to store the .mpd file on django to play on a dash player ?

  3 janvier 2019, par enigmaVada

  I am trying to build a video player on django. I am using MPEG-DASH for adaptive streaming of the video file. I have chosen a sample video in the beginning. Then, using ffmpeg commands, I have encoded the video into 240p, 360p, 480p and 720p videos. Also have encoded audio separately.

  Then, using mp4box, I have generated the .mpd file. I have read that mpd files cannot be run from the local file system and need to be hosted on a server. I have a dash player setup as follows:

  
  
    
      
      
      <script src="https://cdn.dashjs.org/latest/dash.all.min.js"></script>
      
    
    
      
  
         
     
    
  
  

  The url in the src field is a random manifest file that i used to test the player out. It works fine.

  Then, on my django project, I have created a media folder which stores the media files uploaded via a form(root included in settings.py). My question is where do i store the video, audio and .mpd file so that i can play them using the html code which resides in the templates folder. I have tried using the media url of .mpd file in the source but I am unable to play the video.

  Here is the generated mpd file for reference:

  <?xml version="1.0"?>
  
  
   
    
   
  
   
    
     
      
      sample_audio_dashinit.mp4
      
        
      
     
    
    
     
      sample_video_240_dashinit.mp4
      
        
      
     
    
    
     
      sample_video_360_dashinit.mp4
      
        
      
     
     
      sample_video_480_dashinit.mp4
      
        
      
     
    
    
     
      sample_video_720_dashinit.mp4
      
        
      
     
    
   
  
  

• ffmpeg Add watermark/text in video on react native

  3 janvier 2019, par R F

  Right now i'm stuck on android part,here is my code

  I don't want to define font styling or box it just i found this code somewhere so i just copy pasted it as i don't have any knowledge of ffmpeg, I just want a simple text of right aligned in 2 lines on top of right of the video like this.

  I am getting the error in this part of code as the video is getting generated but it does not play and it is of always 262B size

   String[] cmd = new String[] {
              "-i", path, "-vf", String.format("drawtext=\"fontfile=/systems/fonts/DroidSans.ttf: text='%s': " + "box=1: boxcolor=black@0.5: boxborder=5: x=(w-text_w)/t: y=(h-text_h)/2\"", text), "-codec:a", "aac", out.getAbsolutePath()
      };
  

  This is the full code

  @ReactMethod
  public void embedTextOnVideo(String text, String path, int fontSize, String fontColor, final Callback successCallback, final Callback errorCallback)
  {
   FFmpeg ffmpeg = FFmpeg.getInstance(_reactContext);
   try
   {
    ffmpeg.loadBinary(new LoadBinaryResponseHandler() {
  
      @Override
      public void onStart() {}
  
      @Override
      public void onFailure() {}
  
      @Override
      public void onSuccess() {}
  
      @Override
      public void onFinish() {}
    });
  } catch (FFmpegNotSupportedException e) {
    // Handle if FFmpeg is not supported by device
  }
  
  File out = getOutputFile(TYPE_VIDEO);
  
  String[] cmd = new String[] {
          "-i", path, "-vf", String.format("drawtext=\"fontfile=/systems/fonts/DroidSans.ttf: text='%s': " + "box=1: boxcolor=black@0.5: boxborder=5: x=(w-text_w)/t: y=(h-text_h)/2\"", text), "-codec:a", "aac", out.getAbsolutePath()
  };
  try {
    ffmpeg.execute(cmd, new ExecuteBinaryResponseHandler() {
  
      @Override
      public void onStart() {}
  
      @Override
      public void onProgress(String message) {}
  
      @Override
      public void onFailure(String message) {
        errorCallback.invoke("Error ffmpeg executing with message:\n\t" + message);
      }
  
      @Override
      public void onSuccess(String message) {
        successCallback.invoke("Successfully output file with message:\n\t");
      }
  
      @Override
      public void onFinish() {}
    });
  } catch (FFmpegCommandAlreadyRunningException e) {
    // Handle if FFmpeg is already running
  }
  }
  
  @Nullable
  private Throwable writeDataToFile(byte[] data, File file) {
  try {
    FileOutputStream fos = new FileOutputStream(file);
    fos.write(data);
    fos.close();
  } catch (FileNotFoundException e) {
    return e;
  } catch (IOException e) {
    return e;
  }
  
  return null;
  }
  @Nullable
  private File getOutputFile(int type) {
  File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM;
  
  // Create storage dir if it does not exist
  if (!storageDir.exists()) {
    if (!storageDir.mkdirs()) {
      Log.e(TAG, "Failed to create directory:" + storageDir.getAbsolutePath());
      return null;
    }
  }
  
  // media file name
  String fileName = String.format("%s", new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()));
  
  
  enter code hereif (type == TYPE_VIDEO) {
    fileName = String.format("VID_%s.mp4", fileName);
  } else {
    Log.e(TAG, "Unsupported media type:" + type);
    return null;
  }
  
  return new File(String.format("%s%s%s", storageDir.getPath(), File.separator, fileName));
  }
  

• Use ffmpeg to sequentially add multiple audio tracks and pin a specific track to the end

  3 janvier 2019, par kraftydevil

  I have a single video with no audio tracks and want to add several audio tracks sequentially (each track starts immediately after the other).

  The basic case might look something like this:

  |-----------VIDEO-----------VIDEO-------------VIDEO-----------VIDEO-----------|  
  |---FULL AUDIO TRACK 1---|---FULL AUDIO TRACK 2---|---PARTIAL AUDIO TRACK 3---|
  

  Here is my attempt to achieve this:

  ffmpeg -i video.mov -i audio1.mp3 -i audio2.mp3 -i audio3.mp3 -map 0:0 -map 1:0 -map 2:0 -map 3:0 out.mp4
  

  Of course it doesn't produced the desired result. It only uses the first music clip in out.mp4, and no other audio tracks are started when it ends.

  Question 1
  What am I missing in order to add multiple audio tracks sequentially? I assume it's specifying starting and end points of audio clips but I'm coming up short on locating the syntax.

  ...

  In addition, I'm looking for a way to ensure that the video ends with the full duration of AUDIO TRACK 3, as seen below:

  |-----------VIDEO-----------VIDEO-------------VIDEO-----------VIDEO-----------|  
  |---FULL AUDIO TRACK 1---|---PARTIAL AUDIO TRACK 2---|---FULL AUDIO TRACK 3---|
  

  In this case, AUDIO TRACK 2 gets trimmed so that the full AUDIO TRACK 3 is pinned to the end.

  Question 2
  Can this type of audio pinning be done in FFmpeg, or would I have to trim AUDIO TRACK 2 with another program first?

• ffmpeg watermarking with overlay not working for gif

  2 janvier 2019, par Ariza

  I am using ffmpeg for adding a watermark to my MP4 video.

  With this code :

  ffmpeg -i video.mp4 -i watermark.png -filter_complex "[0][1]overlay=15:H-80" output.mp4

  It does work for adding a png image to video ,

  But when i use it for adding a gif to my video, i do not see any watermark on the output

  Like this :

  ffmpeg -i video.mp4 -i watermark.gif -filter_complex "[0][1]overlay=15:H-80" output.mp4

  Is there anything wrong with my code?

  ---

  I just need to add an animated gif to bottom left of my video! that's all i need, if you have better code please share. i'm newbie.