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• Twitch stream with FFMpeg using multiple audio inputs [on hold]

  23 décembre 2014, par Josh Raymond

  I’m using the following script to try and stream my linux desktop to Twitch.tv, I have the stream working, but I want to throw in 2 audio inputs into the stream (one for the game, and one for my mic)

  Here’s the script

  #! /bin/bash
  
  INRES="1900x600"
  
  OUTRES="800x600"
  
  INAUD="pulse"
  
  FPS="25
  
  STREAM_KEY=$(cat ~/.twitch_key)
  
  STREAM_URL="rtmp://live.twitch.tv/app/$STREAM_KEY"
  
  
  
  ffmpeg \
  
  -f alsa -ac 2 -i "$INAUD" \
  
  -f x11grab -s "$INRES" -r "$FPS" -i :0.0+1280,0 \
  
  -vcodec libx264 -s "$OUTRES" -pix_fmt yuv420p \
  
  -acodec libmp3lame -threads 6 -qscale 5 -b 64KB \
  
  -f flv -ar 44100 "$STREAM_URL"

  I use Pulseaudio and have pavucontrol, if that matters. The game would be on "Build-in Audio Analog Stereo" and the mic is from the recording device "Webcam C110 Analog Mono"

  Thanks in advance.

• Streaming to Twitch with FFMpeg

  18 décembre 2014, par Josh Raymond

  I’m using the following script to try and stream my linux desktop to Twitch.tv, I have the stream working, mostly. Unfortunatly, I’m unable to get it to stream my SECOND monitor instead of just my first..

  Here’s the script

  #! /bin/bash
  
  INRES="1900x600"
  
  OUTRES="800x600"
  
  INAUD="pulse"
  
  FPS="25
  
  STREAM_KEY=$(cat ~/.twitch_key)
  
  STREAM_URL="rtmp://live.twitch.tv/app/$STREAM_KEY"
  
  
  
  ffmpeg \
  
  -f alsa -ac 2 -i "$INAUD" \
  
  -f x11grab -s "$INRES" -r "$FPS" -i :0.0+1280,0 \
  
  -vcodec libx264 -s "$OUTRES" -pix_fmt yuv420p \
  
  -acodec libmp3lame -threads 6 -qscale 5 -b 64KB \
  
  -f flv -ar 44100 "$STREAM_URL"

  Everything works as it should (after a few hiccups I solved on my own before coming here)
  But I was wondering if there was a way to pipe TWO audio inputs into ffmpeg ? One for the system sounds (IE game) and one for my mic ? I use Pulseaudio and have pavucontrol, if that matters.

  Thanks in advance.

• Converting From 4-bit RAW Audio to WAV (or another output format)

  10 février 2017, par Haravikk

  Okay, so I’ve got some .raw files from an old game (Zork Nemesis) and determined that they’re audio files, however I’m having trouble converting them into something meaningful.

  With a bit of trial and error in Audacity I’ve found that I can listen to a still noisy version of the audio using raw file input settings of 8-bit signed PCM in stereo with a sample rate of 22050hz. However, my suspicion is that the files may in fact be encoded in 4-bits with a sample rate of 44100hz, but I’m having trouble finding a tool that can handle this.

  What I’m looking for is either a tool that can handle 4-bit raw formats, or even a tool that can determine (or guess at) the format of a given .raw file, so I know for sure what I’m dealing with (as I’m just going by trial and error so far).

  I’ve tried sox, but I’m most likely doing something wrong as it complains of an unsupported size :

  sox -r 44100 -e signed -b 4 -c 2 in.raw out.wav

  I was also going to try ffmpeg, but I can’t find the appropriate format/codec to set.

  In case it gives any further clues ; I’ve tried various combinations of settings, increasing sample size while decreasing sample rate increases the (white-)noise, and even 8-bit is still noisy, which is why I’m thinking 4-bit. I’ve tried signed and unsigned, which strangely doesn’t seem to make much of a difference