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• How to download a part of mp3 from server ?

  20 août 2020, par Sharukh Mohammed

  Use Case

  


  My use case is roughly equal to, adding a 15-second mp3 file to a 1 min video. All transcoding merging part will be done by FFmpeg-android so that's not the concern right now.

  


  The flow is as follows

  


  

  • User can select any 15 seconds (ExoPlayer-streaming) of an mp3 (considering 192Kbps/44.1KHz of 3mins = up to 7MB)

  


  • Then download ONLY the 15 second part and add it to the video's audio stream. (using FFmpeg)

  


  • Use the obtained output

  


  


  Tried solutions

  


  


  • Extracting fragment of audio from a url

    


    RANGE_REQUEST - I have replicated the exact same algorithm/formula in Kotlin using the exact sample file provided. But the output is not accurate (± 1.5 secs * c) where c is proportional to startTime

    


  


  • How to crop a mp3 from x to x+n using ffmpeg ?

    


    FFMPEG_SS - This works flawlessly with remote URLs as input, but there are two downsides,

    


    

    1. as startTime increases, the size of downloaded bytes are closer to the actual size of the mp3.

    


    2. ffmpeg-android does not support network requests module (at least the way we complied)

    


    


  


  


  So above two solutions have not been fruitful and currently, I am downloading the whole file and trimming it locally, which is definitely a bad UX.
I wonder how Instagram's music addition to story feature works because that's close to what I wanted to implement.

  


• Unable to download a file using youtube_dl

  22 octobre 2020, par perkymaster

  I am trying to play music from a bot using ffmpeg and youtube_dl by making using of discord.py but it seems that I am unable to download the file

  


  Here is my code :

  


  voice = get(client.voice_clients, guild=ctx.guild)

ydl_opts={
    'format': 'bestaudio/best',
    'noplaylist': 'True',
    'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec':'mp3',
        'preferredquality':'192',
    }],
}

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    print("Downloading audio now \n")
    ydl.download([url])

for file in os.listdir("./"):
    if file.endswith(".mp3"):
        name=file
        print(f"Renamed File: {file}\n")
        os.rename(file, "song.mp3")

voice.play(discord.FFmpegPCMAudio('song.mp3'), after=lambda e: print(f"{name} has finished playing"))
voice.is_playing()
voice.source=discord.PCMVolumeTransformer(voice.source)
voice.source.volume= 0.7

nname = name.rsplit("-", 2)
await ctx.send(f"Playing {nname}")
print("Playing \n")


  


  Nothing seems to happen, the bot is not playing any music.

  


  I am new to this, can anyone help ?

  


• How to use ffmpeg-python library to download a Twitch VOD with a link retrieved using the streamlink library

  28 octobre 2020, par Daniel Norfolk

  This is the whole code, for easy reference :

  


  import urllib.request
import streamlink
import ffmpeg
stream_url = streamlink.streams("https://www.twitch.tv/videos/783301562")['best'].url
print(stream_url)

try:
    urllib.request.urlretrieve(stream_url, "vod.m3u8")
except Exception as e:
    print(e)

stream = (
    ffmpeg
    .input('vod.m3u8')
    .output('output.mp4')
    .run
)
print(stream)


  


  I am looking at a way of downloading Twitch VODs. I started with the link to a VOD : https://www.twitch.tv/videos/783301562 . I then used the code :

  


  stream_url = streamlink.streams("https://www.twitch.tv/videos/783301562")['best'].url
print(stream_url)


  


  This gave me a new link which, when I go to this link it downloaded a file with a '.m3u8' extension. This link is : https://dqrpb9wgowsf5.cloudfront.net/ab3654a5992fbfa52ccb_briziana_40240109614_1603789265/chunked/index-dvr.m3u8

  


  From here, I first tried to put the link directly into the following code :

  


  stream = (
    ffmpeg
    .input(stream_url)
    .output('output.mp4')
    .run
)
print(stream)


  


  This didn't output any mp4 file but did give the output :

  


  


  >

  


  


  I then added the following code to download the file, I also change the ffmpeg code to use the downloaded file rather then the url :

  


  try:
    urllib.request.urlretrieve(stream_url, "vod.m3u8")
except Exception as e:
    print(e)

stream = (
    ffmpeg
    .input('vod.m3u8')
    .output('output.mp4')
    .run
)
print(stream)


  


  This gave the same result, no mp4 file with the same output as above. Any help would be greatly appreciated !