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• Is it possible to separate voices coming to a single channel at runtime (karaoke principle) ?

  10 décembre 2022, par PineapplePie

  I wonder if it is possible to filter separately two voices at runtime ? Let's say, you're listening to a song and there is a singer (voice A) and you're singing as well (voice B), like in karaoke. My only guess - is to filter out any noise by NoiseSuppressor API and then measure the sound intensity, and assume that the voice A will have 40db and voice B - 50db (which is definitely not the way to go bc songs are mostly not linear like that). Maybe there is a way with using pitches/frequency ? If yes, is there any tool which could help me ? Or algo ? I searched for this in the FFMPEG documentation and read some articles, but it seems like it's extremely hard - because I will have the only channel (an android device) that receives both sounds - your singing and singer's singing.

  


  So maybe somebody could guide me on the right path where to look or what I could use/read ?

  


• How to adjust showwaves position to the bottom of a video in ffmpeg ?

  14 avril 2021, par Dooyum Ityav

  I am trying to adjust the position of waveform in a video using ffmpeg, the position by default is in th center, but i will like to shift it to the bottom. I know i need to use overlay filter, but how to call it is my problem. I tried this but doesn't work.

  


  ffmpeg -i security3.mp3 -filter_complex "[0:a]showwaves=s=1280x202:mode=line[sw]; [sw]overlay=0:H-h,drawtext=fontcolor=white:x=10:y=10:text='\"Song Title\" by Artist'[out]" -map "[out]" -map 0:a -c:v libx264 -preset fast -crf 18 -c:a copy output.mp4


  


  I am getting this error :

  


  Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_overlay_1


  


  Can someone help me here please ?

  


• How to detect when a mp3 stops playing in ffmpeg

  23 mai 2021, par Jacob Shankman

  back yet again to ask this : I have a ost command for my discord bot. All it does is join the vc that the user is in, and plays a random choice of mp3's that I have as a list. It works fine. Except for when the song is over, it just stays there. Im wondering how to detect when ffmpeg has finished playing the mp3 so
I can execute a function to tell the bot to disconnect once it has finished. Here is the code for the command :

  


  @client.command()
async def speak(message):
    voice_s = await message.author.voice.channel.connect()
    voice_s.play(discord.FFmpegPCMAudio(random.choice(speak_list)))