Hi Philipp, On Wed, Jul 25, 2018 at 08:56:56AM +0200, hollundertee@xxxxxxx wrote: > Hi, > > I have to apologise, this mail is going to be long, so I'll try to > structure it a bit. > > Overview > I have been live streaming on twitch for the past year, mostly games > and purely as a hobby. The possibilities of PA and OBS for routing and > audio processing are rather limited, I'd like to try and improve my > setup by adding JACK to the mix. > > Current Setup > 2-3 Audio interfaces. My main one is the UA-25 usb interface. There is > another in the GPU connected via HDMI to the monitor and a usually > deactivated one on the motherboard. > I am mostly streaming gameplay, most if not all games rely on ALSA or > PulseAudio, so I have PulseAudio running. In OBS I simply capture the > UA-25 "desktop output". > I also have it capture the UA-25 inputs, of which only one is connected > to the microphone. There is an option within OBS to have that signal on > both channels. > I use the compressor plugin built into OBS with pretty much "default" > voice/voiceover settings. > Afterwards "desktop" and voice get mixed to a stereo signal and > streamed. > I monitor the "desktop" signal as it is immediate and doesn't contain > my voice. To check whether the mix is fine I need to check either the > outgoing or the incoming signal (which is delayed by a few seconds). > Currently I route the incoming signal via PA to the GPU audio > interface. To actually hear it I need to physically switch the > headphones for the in-ears connected to the monitor. > I do not use a cam and intend to keep it that way. > > Current Problems > A) Monitoring is cumbersome because I need to switch between the proper > headphones and the in-ears. While the in-ears aren't bad by themselves, > the sound through GPU -> HDMI -> Monitor is pretty bad. It is barely > enough to judge whether or not the levels are totally off. > I'd much prefer to be able to monitor using my proper headphones at the > push of a button. > B) OBS comes with rather few audio plugins by default > (https://github.com/obsproject/obs-studio/wiki/Filters-Guide) and I'm > not convinced they are more than serviceable. The compressor is hard to > set up, I wish it had at least some visual indication for the threshold. > > Possible solution > While there are a few effects rack for Pulse Audio, like > https://github.com/wwmm/pulseeffects, and Pulse Audio can do routing I > don't understand PA's routing and rather use JACK. Since I haven't > followed Linux Audio land quite as closely the last few years I have a > few questions. > > 1) Can someone tell me whether the OBS jack plugin is good enough or > does something stupid? The code can be found here: > https://github.com/obsproject/obs-studio/tree/master/plugins/linux-jack > 2) Is there a reliable and if possible hassle free way to get ALSA and > PA into JACK? ALSA loopback would probably not work for programs using > PA directly. One way is to use PA and JACK on separate audio interfaces. Pulseaudio can also be run above JACK. https://github.com/jackaudio/jackaudio.github.com/wiki/WalkThrough_User_PulseOnJack I would suggest getting as much functionality handled in the JACK layer as possible. > 3) I think switching around monitoring should be doable with a simple > script calling jack_connect, provided the ports are predictably named. > Even I should be able to do that. Is there another solution? Another solution would be to drive both monitors, and set up some kind of crossfader, if you need one. > 4) Even though it's a small setup I'd need some sort of session > management to bring up at least the jack side of things. jackd, the JACK daemon, runs continuously. Various DAWs and recorders can make JACK connections for signal I/O for individual tracks. Being able to run shell scripts on project load or track setup can be useful, too. > 5) Finally what do you recommend as plugin host and compressor plugin > for voice? There are many possible plugin hosts. Some can do glitch-free switching in and out of effects. I'm partial to Ecasound, which is flexible enough to do I/O with JACK and ALSA devices simultaneously (JACK usually works with a single sound card.) Others will recommend a compressor, there are many LADSPA and LV2 plugins available. > Thank you in advance for your help. I can at least document the setup > somewhere, for the next one who tries to do something like that. I > could do that on my blog (that no one ever reads) or if you know some > good wiki or something I can put it there. Posting an article (or link a blog article) would be on-topic for this list. And here is one wiki: https://wiki.linuxaudio.org/wiki/start cheers, joel > Best Regards, > Philipp > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > https://lists.linuxaudio.org/listinfo/linux-audio-user -- Joel Roth _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
