Streaming using ffmpeg and excluding some audio

fjnalta · 2014-01-15 13:05:08

Hello,

i'm trying to stream some games to Twitch.tv with ffmpeg using the script from Archwiki in my .bashrc

streaming() {
INRES="1920x1080"
FPS="20"
CBR="350k"
QUAL="fast"
STREAM_KEY="$1"
URL="rtmp://live.justin.tv/app/$STREAM_KEY" #flashver=FMLE/3.0\20(compatible;\20FMSc/1.0)"

ffmpeg -f x11grab -s "$INRES" -r "$FPS" -i :0.0 \
   -f alsa -ac 2 -i pulse -vcodec libx264 -vb "$CBR" -crf 30 -preset "$QUAL" -s "1280x720" \
   -acodec libmp3lame -ab 96k -ar 44100 -threads 0 -pix_fmt yuv420p \
   -f flv "$URL"
}

At the moment, this is working pretty well, except that it is recording the whole sound i'm hearing. Most of the time I want to record in-game sound (pretty often wine) + music (banshee), but exclude my system and Teamspeak sounds. At the same time i wanna hear everything on my headphones.

As you can see in the script im using pulse on top of ALSA. I've already read some Threads about creating a null-sink and loopback-devices in Pulse, but i cant get the job done and I don't know if this is the best way to do this.

Maybe there is a way to grab the sound directly from the applications?

I would prefer a cmd-line based option instead of lots of tools to get it done. As well as i would like to use only ALSA.

I am not very familiar with the sound servers. Any help is appreciated.

DrZaius · 2014-01-17 06:16:22

fjnalta wrote:

i'm trying to stream some games to Twitch.tv with ffmpeg using the script from Archwiki in my .bashrc

Can you provide a link so I can exorcise it? I've seen this, or a variant of this script, too many times from various users.

fjnalta · 2014-01-27 21:02:23

Hi, sorry for my late reply.

Could you please explain which link you need? The script is seen above. Link: https://bbs.archlinux.org/viewtopic.php … 9#p1371159

I need to grab the sound directly from the application stream with ffmpeg. That should be pretty much it.

DrZaius · 2014-01-27 21:24:41

I saw your first post. You mentioned that that script is on "Archwiki". What is the URL?

Slithery · 2014-01-27 21:32:47

Hint - Search wiki for twitch.

fjnalta · 2014-01-28 20:19:58

anyone got a clue about my problem btw?

Jellicent · 2014-01-31 08:23:27

I'd also be interested in an answer to this. I use only alsa though.

progandy · 2014-01-31 09:08:58

With pulse you should be able to create dummy sinks which you then can record or merge onto the soundcard, this might help: http://www.maartenbaert.be/simplescreen … ame-audio/

with pure alsa, I don't know how to do it.
Edit: Maybe this will give you some idea: https://bbs.archlinux.org/viewtopic.php?pid=1236286

Last edited by progandy (2014-01-31 09:37:00)

Jellicent · 2014-01-31 09:53:53

progandy wrote:

With pulse you should be able to create dummy sinks which you then can record or merge onto the soundcard, this might help: http://www.maartenbaert.be/simplescreen … ame-audio/
with pure alsa, I don't know how to do it.
Edit: Maybe this will give you some idea: https://bbs.archlinux.org/viewtopic.php?pid=1236286

I don't see how that would help, maybe I'm missing something. Could you tell me what exactly in that thread you're referring to?

My situation is the following: It records fine. Everything that I can hear is recorded. But I'd like to only record the game sounds for example.

Last edited by Jellicent (2014-01-31 09:56:03)

Arch Linux

#1 2014-01-15 13:05:08

Streaming using ffmpeg and excluding some audio

#2 2014-01-17 06:16:22

Re: Streaming using ffmpeg and excluding some audio

#3 2014-01-27 21:02:23

Re: Streaming using ffmpeg and excluding some audio

#4 2014-01-27 21:24:41

Re: Streaming using ffmpeg and excluding some audio

#5 2014-01-27 21:32:47

Re: Streaming using ffmpeg and excluding some audio

#6 2014-01-28 20:19:58

Re: Streaming using ffmpeg and excluding some audio

#7 2014-01-31 08:23:27

Re: Streaming using ffmpeg and excluding some audio

#8 2014-01-31 09:08:58

Re: Streaming using ffmpeg and excluding some audio

#9 2014-01-31 09:53:53

Re: Streaming using ffmpeg and excluding some audio

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