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• How to add outro background music to another audio file with FFMpeg ?

  8 novembre 2019, par Sebastian

  I have two files : story.wav (180 seconds) and background-music.wav (90 seconds). I need a FFMpeg command that merges the two files and fades in background-music.wav (with esin) 30 seconds before the end of story.wav.

  I have this in separate commands :

  ffmpeg -i background-music.wav -filter_complex afade=t=in:curve=esin:ss=0:d=30 fadein.wav
  
  ffmpeg -i fadein.wav -af "adelay=150000|150000" delayed.wav
  
  ffmpeg -i delayed.wav -i story.wav -filter_complex amix=inputs=2:duration=longest final.wav

  This is ugly - and it has the problem, that the volume of the first part is only 50% (the volume should be kept).

  There must be an elegant way to achieve this in one command - but how ?

  Bonus question : how can I convert the result to mp3 (with parameters like bit rate set) in the same command ?

  Thanks for any help !
  Sebastian

• How do I install FFmpeg for my bot to play music ?

  28 juin 2023, par Shiqi Wang

  I followed a Youtube Tortual on how to make a music bot, and every piece of code made sense, there is just one problem. I thought I installed FFmpeg which is the thingy which makes the bot play audio I believe, the way I installed it was running the following command : pip install ffmpeg

  


  So I waited it to finish up, and attempted to play music, and here is the error message

  


  Traceback (most recent call last):
  File "C:\Users\Shiqi\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\discord\ext\commands\bot.py", line 902, in invoke
    await ctx.command.invoke(ctx)
  File "C:\Users\Shiqi\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\discord\ext\commands\core.py", line 864, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "C:\Users\Shiqi\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\discord\ext\commands\core.py", line 94, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: DownloadError: ERROR: ffprobe/avprobe and ffmpeg/avconv not found. Please install one.


  


• About youtube-dl

  30 octobre 2017, par 王延康

  As you all know, youtube-dl can download videos from youtube.com. Usually we use the directive e.g. youtube-dl -f 266+140 www.youtube.com/xxxxxx. Then youtube-dl will download the 266(only video) and 140(only audio) individually and then merge them with a wink.

  However, recently when I download a 4K HD video, the quality of the analyised audio only have 128kps. But I have the same audio at 320kps. I’ve tried only download the video without audio and use the ffmpeg to merge them. But the speed was so slow far less than the normal download ways.(266+140) So here comes the question, how can I use the youtube-dl and the ffmpeg to merge my video and 320kps audio quickly just like youtube-dl did ?