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• FFMPEG / Melt audio crossfade with cutting last 10 seconds (loop)

  27 mai 2019, par user2455079

  Need to create audio loop with same file to create audio loop for needed time.
  The problem is that at the end of music track starts silence, so need to remove last 10 seconds from file and make crossfade for 3 seconds.

  basically i can cut last 10 seconds ffmpeg -i music.mp3 -t (time-10) -c copy out.mp3 and than run crossfade :

  ffmpeg -i out.mp3 -i out.mp3 -i out.mp3 -vn
  
         -filter_complex "[0][1]acrossfade=d=3:c1=tri:c2=tri[a01];
  
                          [a01][2]acrossfade=d=3:c1=tri:c2=tri"
  
         out.mp3

  Is there any way to do this using single command ?

• Discord.py ffprobe/avprobe and ffmpeg/avconv not found error

  20 juillet 2021, par Exd Craft

  Im hosting this discord bot using android device and the bot is used to play music using youtube_dl module, and when i launch the play music command, i got and error where ffprobe/avprobe and ffmpeg/avconv not found. I know how to solve this problem in pc but im still dont know how to fix this on android. For the test here, im using a music from soundcloud since its more faster to download the music.

  


  Here's the error message on the terminal

  


  Logged in as Test Bot#6599\
[soundcloud] user-785177525/yoasobi-yoru-ni-kakeru-x-l-a-b-remix: Downloading info JSON\
[soundcloud] None: Downloading webpage\
[soundcloud] None: Downloading webpage\
[soundcloud] user-785177525/yoasobi-yoru-ni-kakeru-x-l-a-b-remix: Downloading info JSON\
[soundcloud] 895894084: Downloading JSON metadata\
[soundcloud] 895894084: Downloading JSON metadata\
[soundcloud] 895894084: Downloading JSON metadata\
[download] Destination: YOASOBI - Yoru ni Kakeru [x l a b. Remix]-895894084.mp3\
[download] 100% of 3.60MiB in 00:03\
ERROR: ffprobe/avprobe and ffmpeg/avconv not found. Please install one.


  


  Here's the sample code for the play music command

  


  


  


       @client.command()
     async def playsc(ctx, url : str, *, message):
         song_there = os.path.isfile("song.mp3")
         try:
             if song_there:
                 os.remove("song.mp3")
         except PermissionError:
             em8 = discord.Embed(title = "Music Is Currently Playing", description = 'Please wait for the current playing music to end or use %leave <:_Paimon6:827074349450133524>.\nMusic provided by {ctx.author.mention} <:_Paimon6:827074349450133524>',color = ctx.author.color)
             await ctx.send(embed = em8)
             return

         voiceChannel = discord.utils.get(ctx.guild.voice_channels, name=message)
         await voiceChannel.connect()
         voice = discord.utils.get(client.voice_clients, guild=ctx.guild)
         em6 = discord.Embed(title = "Downloading Soundcloud Music", description = f'{url}\n\nPlease wait for paimon to setup the music you provide.\nMusic provided by {ctx.author.mention} <:_Paimon6:827074349450133524>',color = ctx.author.color)
         await ctx.send(embed = em6, delete_after = 2)
         await ctx.message.delete()

         ydl_opts = {
             'format': 'bestaudio/best',
             'postprocessors': [{
                 'key': 'FFmpegExtractAudio',
                 'preferredcodec': 'mp3',
                 'preferredquality': '192',
             }],
         }
         with youtube_dl.YoutubeDL(ydl_opts) as ydl:
             ydl.download([url])
         for file in os.listdir("./"):
             if file.endswith(".mp3"):
                 os.rename(file, "song.mp3")
         voice.play(discord.FFmpegPCMAudio("song.mp3"))
        
         em1 = discord.Embed(title = "Now Listening Soundcloud Music", description = f'{url}\n\nPlease use %leave first to change music.\nMusic provided by {ctx.author.mention} <:_Paimon6:827074349450133524>',color = ctx.author.color)
         await ctx.send(embed = em1)

  


  


  



• What are those bars in audio visualizer exactly ? Need to make visualizer with help of ffmpeg

  3 novembre 2019, par Soroosh

  I’m trying to understand what are those bars in audio visualizers exactly.

  

  I tried to decode a mp3 file using ffmpeg like this :

  ffmpeg -i music.mp3 -t 1 -f s8 -acodec pcm_s8 -ar 1 out_1sec_sr1.raw

  The output of this command is raw data of first second of the music.mp3 in 1hz samplerate.
  But the output file contains just 2 bytes !!! one for the left channel and one for the right channel. I’m pretty sure that it is not possible to visualize a second of a music using only two bytes. I guess each bar in below picture is at least one byte.
  Am I missing something in ffmpeg command ? Is pcm_s8 codec appropriate for getting such data to visualize audio at all ?

  I’m using this library in my android project to use ffmpeg :
  https://github.com/brarcher/ffmpeg-android-java

  I do not have any problem in drawing those bars and reading raw data file from storage using inputStream.