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• Normalizing audio of several wav snippets with ffmpeg

  17 mai 2023, par dick_kickem

  I searched the site and I figured that maybe ffmpeg-normalize could be part of my solution but I'm really not sure.

  


  In my free time me and my friends create quizzes for people to solve. One of these is a music quiz, where you hear audio snippets and have to guess the artist and song title. A few years back I did most of them using Audacity, which means recording snippets from existing videos, inserting fade in and fade out to every snippet, putting announcements like "Number x" before the x-th song and also making sure that all songs are fairly of equal loudeness (-6.0 dB).

  


  The result in Audacity looked like this.

  


  

  


  Lazy as I am, I learned about ffmpeg and wrote a script, which does all these steps for me. The script is mostly written in bash. I use some audio files where I extract the audio in wav-format, add a fade in and fade out and then I try to set the volume to -6.0 dB as with Audacity. The part where this happens looks like this :

  


  ...[some code before]...

# write the audio details of temmp.wav into the "info" file
ffmpeg -i temp.wav -filter:a volumedetect -f null - 2> info

#check out the max volume of temp.wav
max_vol=$(grep "max_volume" info | cut -d ' ' -f5)

# determine the difference between the max volume and -6
vol_diff=$(expr "-6-($max_vol)" | bc -l)

# change temp.wav loudness by the determined difference
ffmpeg -y -i temp.wav -filter:a "volume=$vol_diff$db" $count.wav

...[some code after]...


  


  I do this with all snippets, leaving me with usually ten snippets in the format 1.wav, 2.wav and so on. Lastly, I concatenate them all with announcements in the form nr1.wav, 1.wav, nr2.wav, 2.wav and so on. Overall this works really great for me. Yet, the loudness is not quite as equal as in Audacity. Here is a screenshot of a generated music quiz using the described script (not the same music snippets as the example before) :

  


  

  


  You can see some peaks pointing out. It's not bad and in fact, it works for me in most cases, but it's not like what I used to have with Audacity. Does anyone have any idea how to fix that to make it more equal ?

  


  Thank you in advance and kind regards

  


• convert java code to android code [closed]

  16 avril 2013, par adityag

  I want to mix two audio files in android. First a song from library and second a sound recorded from mic.

  To begin with, I tried doing it on desktop using JS Resources Audio concat Program

  Using this code, I can mix/merge/overlap 2 sound wav files on desktop when i use float mix mode (-f).

  Now I was trying to do this in android environment. But found that javax.sound.sampled.* ; used in this code is not supported by android.

  Can anyone guide me how to deal with this situation ?

  PS : other approach i tried is trying to use some ffmpg. But frankly, I couldn't understand how to make it work to suit my requirement.

• voice_client.play doesn't continue loop (Discord)

  19 mars 2023, par Razurio

  songs = asyncio.Queue(maxsize=0)
currently_playing = False


@client.command()
async def play(ctx, url):
    global songs
    global currently_playing
    if currently_playing:
        with yt_dlp.YoutubeDL({"format": "bestaudio", "outtmpl": "Queue_Download/%(title)s.%(ext)s"}) as ydl:
            info = ydl.extract_info(url, download=True)
            filename = ydl.prepare_filename(info)
            await songs.put({"file": filename, "info": video_info(url)})
            # print("test 1")
    else:
        with yt_dlp.YoutubeDL({"format": "bestaudio", "outtmpl": "Queue_Download/%(title)s.%(ext)s"}) as ydl:
            info = ydl.extract_info(url, download=True)
            filename = ydl.prepare_filename(info)
            await songs.put({"file": filename, "info": video_info(url)})
            # print("test 2")
        asyncio.create_task(queue(ctx))



async def queue(ctx):
    global songs
    global currently_playing
    currently_playing = True
    while True:
        if songs.empty():
            currently_playing = False
            await ctx.reply("Queue is now empty")
            await ctx.voice_client.disconnect()  # disconnect from voice channel when queue is empty
            break
        else:    
            song = await songs.get()
            filename = song["file"]
            voice_channel = ctx.author.voice.channel
            if not ctx.voice_client:  # check if bot is not already connected to a voice channel
                await voice_channel.connect()

            await ctx.reply('playing')
            await ctx.voice_client.play(discord.FFmpegPCMAudio(filename))

@client.command()
async def stop(ctx):
    global songs
    await ctx.voice_client.disconnect()
    await empty_queue(songs)
    await ctx.reply('Stopped')

async def empty_queue(songs):
    while not songs.empty():
        songs.get_nowait()


  


  I have problems with the "await ctx.voice_client.play(discord.FFmpegPCMAudio(filename))" which doesn't continue after finishing.

  


  I know you can use a after= parameter in voice_client.play() but I didn't manage to get it to work to recursivly call queue()