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• android - how to play two audio file at same time

  29 janvier 2016, par Sajad Norouzi

  I wanna create an karaoke android app. so far, user can listen to the song and record his voice. now I want to let user some editing like setting volume of his voice or setting Reverb effect. I have some library like ffmpeg and sox on android and don’t have problem for mixing two audio, but for setting volume or Reverb wanna play two audio file simultaneously using mediaplayer, however it’s not possible because android doesn’t let us play two audio file with mediaplayer at same time even with two different object of mediaplayer. so, what is the solution ?

• Edit ffmpeg arguments while playing

  12 mars 2019, par C0d0r

  I am building a client (discord.js) that plays music from youtube. Before the client starts playing the ffmpeg-arguments (filters etc.) can be edited and piped into the stream. I use prism-media (npm) to define the args.

  My Question : How is it possible to edit these arguments while the client is playing ? f.ex. disable in the middle of a song etc...

  The code basically looks like in the Readme example on github : https://github.com/amishshah/prism-media/tree/dev

• Does android support .m4a metadata ?

  23 octobre 2016, par David Barishev

  Im using taglib-sharp-portable to tag audio files in my app. My audio files are .acc, which are inboxed in a .m4a format.
  I have no option but to use this format, since i’m extracting the audio from a Video file (.mp4/.webm), based on using this SO answer. I can’t re encode the music stream, since it will take a lot of time on an cellular device.
  The problem i’m facing is that the music player doesn’t recognize the tags, even though they are tagged correctly. If i pull the file from the device, and view it on my Windows PC, i can see the tags fine.

  Here is the code im using to tag the file :

  public static async Task tagFile(File musicFile, string name, string songID, Context c, SongDownloadNotification nf = null)
  
  { 
  
              var imageFilePath = await DownloadThumbnailImage(songID, c, nf);
  
              string[] songDetails = GetSongDetails(name);
  
  
  
              Log.Verbose(tag, "Exstraced song Details. Artist Name: {0}, Song Name: {1}", songDetails[0], songDetails[1]);
  
  
  
              var fsMusic = new System.IO.FileStream(
  
                  musicFile.CanonicalPath,
  
                  System.IO.FileMode.Open,
  
                  System.IO.FileAccess.ReadWrite,
  
                  System.IO.FileShare.ReadWrite,
  
                  4096,
  
                  true);
  
  
  
              TagLib.File tagFile = TagLib.File.Create(new TagLib.StreamFileAbstraction(musicFile.CanonicalPath, fsMusic, fsMusic));
  
  
  
              tagFile.Tag.Clear();
  
  
  
              tagFile.Tag.Performers = new[] { songDetails[0] };
  
              tagFile.Tag.AlbumArtists = new[] { songDetails[0] };
  
              tagFile.Tag.Title = songDetails[1];
  
              tagFile.Tag.Album = songDetails[1];
  
  
  
              var fsImage = new System.IO.FileStream(
  
                  imageFilePath,
  
                  System.IO.FileMode.Open,
  
                  System.IO.FileAccess.ReadWrite,
  
                  System.IO.FileShare.ReadWrite,
  
                  4096,
  
                  true);
  
  
  
              tagFile.Tag.Pictures = new[] { new TagLib.Picture(new TagLib.StreamFileAbstraction(musicFile.CanonicalPath, fsImage, fsImage)) };
  
  
  
              tagFile.Save();
  
              Log.Debug(tag, "Succesfully added tags to file");
  
  
  
              fsMusic.Close();
  
              fsImage.Close();
  
  
  
              if (!new File(imageFilePath).Delete())
  
                  Log.Warn(tag, "Couldnt delete tmp file");
  
              else
  
                  Log.Verbose(tag, "Deleted thumbnail file succesfully");
  
  } 

  These question came to me :

  • Is my choice of encapsulating the raw .acc file in .m4a file good ? The format im looking into, is audio only, is .m4a overkill for it ?
  • Does android support reading tags of .m4a file ? If so what did i do wrong with my code ?If not, how can i add tags to .acc ( or some other ’parent’ format), that android supports, and i would not need to re encode it ?