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• Input/output error while using ffmpeg with pulse

  2 septembre 2017, par user116522

  i want to record my audio output. Yesterday, i used the following command

  ffmpeg -f pulse -ac 2 -i 1 -c:a libfdk_aac -b:a 192k test4.m4a

  and it was working. But now, i receive the output :

   ffmpeg version N-83415-g012dd8c Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.8 (SUSE Linux)
  
    configuration: --enable-gpl --enable-libx264 --enable-libx265 --enable-nonfree --enable-libfdk-aac --enable-libpulse
  
    libavutil      55. 46.100 / 55. 46.100
  
    libavcodec     57. 75.100 / 57. 75.100
  
    libavformat    57. 66.101 / 57. 66.101
  
    libavdevice    57.  2.100 / 57.  2.100
  
    libavfilter     6. 73.100 /  6. 73.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  1: Input/output error

  The command

  pactl list sources

  says :

  Source #0
  
          State: SUSPENDED
  
          Name: alsa_output.pci-0000_01_00.1.hdmi-stereo.monitor
  
          Description: Monitor of HDA NVidia Digital Stereo (HDMI)
  
          Driver: module-alsa-card.c
  
          Sample Specification: s16le 2ch 44100Hz
  
          Channel Map: front-left,front-right
  
          Owner Module: 6
  
          Mute: no
  
          Volume: front-left: 65536 / 100% / 0,00 dB,   front-right: 65536 / 100% / 0,00 dB
  
                  balance 0,00
  
          Base Volume: 65536 / 100% / 0,00 dB
  
          Monitor of Sink: alsa_output.pci-0000_01_00.1.hdmi-stereo
  
          Latency: 0 usec, configured 0 usec
  
          Flags: DECIBEL_VOLUME LATENCY 
  
          Properties:
  
                  device.description = "Monitor of HDA NVidia Digital Stereo (HDMI)"
  
                  device.class = "monitor"
  
                  alsa.card = "1"
  
                  alsa.card_name = "HDA NVidia"
  
                  alsa.long_card_name = "HDA NVidia at 0xf7080000 irq 17"
  
                  alsa.driver_name = "snd_hda_intel"
  
                  device.bus_path = "pci-0000:01:00.1"
  
                  sysfs.path = "/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1"
  
                  device.bus = "pci"
  
                  device.vendor.id = "10de"
  
                  device.vendor.name = "NVIDIA Corporation"
  
                  device.product.id = "0fb9"
  
                  device.string = "1"
  
                  module-udev-detect.discovered = "1"
  
                  device.icon_name = "audio-card-pci"
  
          Formats:
  
                  pcm

• Discord.py Music Bot problem with FFmpeg on heroku

  16 mai 2020, par Phantom_7331

  I'm coding my first music bot for discord and successfully tested it on the localhost. After that, I moved it on Heroku and installed FFmpeg buildpack for it. But for some reason, it doesn't work.
Here is proof that I installed FFmpeg buildpack on Heroku : Screen

  



  Here is my code (that works well on localhost) :

  



  youtube_dl.utils.bug_reports_message = lambda: ''

ytdl_format_options = {
'format': 'bestaudio/best',
'outtmpl': '%(extractor)s-%(id)s-%(title)s.%(ext)s',
'restrictfilenames': True,
'noplaylist': True,
'nocheckcertificate': True,
'ignoreerrors': False,
'logtostderr': False,
'quiet': True,
'no_warnings': True,
'default_search': 'auto',
'source_address': '0.0.0.0'
}

ffmpeg_options = {
    'options': '-vn'
}

ytdl = youtube_dl.YoutubeDL(ytdl_format_options)

class YTDLSource(discord.PCMVolumeTransformer):
def __init__(self, source, *, data, volume=0.5):
    super().__init__(source, volume)

    self.data = data

    self.title = data.get('title')
    self.url = data.get('url')

@classmethod
async def from_url(cls, url, *, loop=None, stream=False):
    loop = loop or asyncio.get_event_loop()
    data = await loop.run_in_executor(None, lambda: ytdl.extract_info(url, download=not stream))

    if 'entries' in data:
        data = data['entries'][0]

    filename = data['url'] if stream else ytdl.prepare_filename(data)
    return cls(discord.FFmpegPCMAudio(filename, **ffmpeg_options), data=data)

@client.command()
async def join(ctx):
channel = ctx.message.author.voice.channel
if ctx.voice_client is not None:
    return await ctx.voice_client.move_to(channel)
await channel.connect()

@client.command()
async def play(ctx, *, URL):
    async with ctx.typing():
        player = await YTDLSource.from_url(url)
        ctx.voice_client.play(player, after=lambda e: print('Player error: %s' % e) if e else None)
    await ctx.send('Now playing: {}'.format(player.title))


  


• Muting audio when video is not being played in complex filtergraph

  18 février 2020, par Vitalis Hommel

  My goal is to silence audio till when the appropriate video is playing.

  This is what I tried

  ffmpeg -i a.mp4 -itsoffset 00:00:4.061 -i b.mp4 -itsoffset 00:00:8.016 -i c.mp4 -itsoffset 00:00:12.016 -i d.mp4 -filter_complex "[0:a][2:a][3:a]amerge=inputs=3,volume=0[a0];[1:a]adelay=4061[a1];[a0][a1]amerge=inputs=2[audio]..." -map "[audio]" ... -r 60 -vcodec h264 zusammen.mp4

  It starts playing together at the start to be overlayed at 4061. How do I hear the audio in sync with video while what is not being played is muted ?