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• How to convert audio and keep track metadata with all formats

  16 septembre 2018, par Bleuzen

  my inputs are multiple FLAC and OGG files.
  I want to convert them all to mp3. (a script does batch converting, ffmpeg command only has to handle one input file).

  I also want to keep the tags (song artist, track name, album name, ...).
  My current command to do this is :

  ffmpeg -vn -n -i $INFILE -c:a libmp3lame -q:a 1 -ar 44100 -map_metadata 0:s:0 -id3v2_version 3 $OUTFILE.mp3

  Now the problem is : it works when the input file is an OGG file. But it doesn’t work if input is a FLAC file.

  I also found a command for FLAC input files :

  ffmpeg -vn -n -i $INFILE -c:a libmp3lame -q:a 1 -ar 44100 $OUTFILE.mp3

  (which is the same but without the map_metadata option. So FLAC tags are copied without that options. But without them it doesn’t work for OGG input files. And with the options it doesn’t work for FLAC input files.

  How can I handle both input formats and keep tags of both without needing a different command ?

• Firefox audio tag doubles length of OGG Vorbis

  22 mai 2014, par tomysshadow

  So, here I have a demo file from my website

  http://members.shaw.ca/darolynk/breakup/html5game/snd_music.ogg

  I am running off of Firefox Beta 30.0 and this issue does not persist in Google Chrome. In Firefox, when I play the file back, the length is displayed at around twice of its actual length as 32:13 when it is only 12:52 in length. Even worse, the audio stutters, playing one second of noise, one second of silence. This issue is not persistent in Chrome nor Opera. It is not a streaming issue (the song is streamed by the time it is played back in fact).

  I am wondering if this is an issue with the codec or with Firefox’s intrepretation of the codec, but more importantly, I want to know how to fix it. Some information about the file : the file is in OGG Vorbis format, 44100 Hz, 32 kbps Mono (yes, I am running out of storage space). It was encoded with SUPER, which in turn uses FFMpeg and MEncoder as necessary.

  This does not apply to all files of this format, making the issue even stranger. Are OGG Vorbis files over a certain length not allowed or interpreted differently by Firefox ? This must be the case for someone else and not just me...

  Any help is appreciated, thanks in advance !

• Stream specifier '' in filtergraph description [0][1]concat=a=1:n=1:v=1[s0] matches no streams

  9 août 2020, par Tanmoy Bhowmick

  i am trying to concatenate two audio files in django with ffmpeg but getting this error Stream specifier '' in filtergraph description [0][1]concat=a=1:n=1:v=1[s0] matches no streams.`

  


  here is my function

  


  def audiomarge(request):
    recorded_audio = request.FILES['audio']
    new = tempSong(tempSongFile=recorded_audio)
    new.tempSongFile.name = 'test.wav'
    new.save()
    record_file_path = new.tempSongFile.path
    record_file_path = str(record_file_path)
    recorded_audio = request.POST.get('audio')
    songslug = request.POST.get('songslug')
    current_song = Song.objects.filter(slug=songslug)[0]
    current_song_path = current_song.songFile.url 
    current_song_path = '.'+(str(current_song_path))
    
    input_first = ffmpeg.input(current_song_path)
    input_second = ffmpeg.input(record_file_path)


    ffmpeg.concat(input_first, input_second, v=1, a=1).output('./finished_video.wav').run()
    return HttpResponse('okay')


  


  i have also tried .compile() instead of .run() in this case nothing is happening