| AppAraat[m] | corshmock: congrats! how did you make it work? | 18:03 |
|---|---|---|
| AppAraat[m] | hmc: Kdenlive? | 18:04 |
| AppAraat[m] | unrelated: How can I monitor ALSA for xruns? I found this (https://www.alsa-project.org/main/index.php/XRUN_Debug) but I think it's outdated since I don't have a `xrun_debug` where it should be. | 18:04 |
| OvenWerks | AppAraat[m]: the alsa xruns are mintored by the application using alsa. | 19:33 |
| OvenWerks | *monitored | 19:33 |
| OvenWerks | (or not as the application sees fit) | 19:34 |
| OvenWerks | xruns happen when the application doesn't deal with alsa in a timely manner | 19:35 |
| AppAraat[m] | ah, so the xrun monitoring of JACK was simply because JACK was being an ALSA app in that case. Interesting. | 19:37 |
| OvenWerks | yes | 19:37 |
| AppAraat[m] | thought it had to do with ALSA (sometimes?) not being able to deal with hardware in a timely manner | 19:38 |
| OvenWerks | alsa ends up being an API to allow alsa driven programs to access the hardware in a uniform manner. | 19:39 |
| AppAraat[m] | yeah in terms of (abstraction?) layers I understand it goes something like: hardware <-> ALSA <-> ALSA apps (JACK, Bitwig Studio, PulseAudio etc.) | 19:40 |
| AppAraat[m] | but mostly for pro audio it's something like: hardware <-> ALSA <-> JACK (ALSA app) <-> JACK apps (aka clients, like Bitwig Studio, PulseAudio, Ardour etc.) | 19:41 |
| OvenWerks | It can be, but unless you really want to use external jack applications as synths or effects, most of them can tie directly to alsa and use plugins instead. | 19:43 |
| OvenWerks | Ardour, for example, now recomends using alsa dirrect unless you wish to be able to hear desktop audio at the same time. | 19:43 |
| OvenWerks | (or use a jack only synth or effect) | 19:44 |
| OvenWerks | or tie to a sequncer | 19:44 |
| AppAraat[m] | heh, didn't know about Ardour recommending doing stuff on ALSA directly. Interesting. Although if "desktop audio" is an ALSA app then it can just use dmix, no? | 19:48 |
| AppAraat[m] | in which case it also obsoletes the need for JACK. So pretty much the "only" thing I need it for is having a soft mixer between JACK clients and JACK (for that audio interface that didn't support soft mixing lol) | 19:50 |
| OvenWerks | audio interfaces don't do soft mixing for the most part, they generally have software controlled hw mixing. | 19:51 |
| OvenWerks | The link from any pro-audio application to an audio device should not have a software mixer in between anyway. | 19:52 |
| AppAraat[m] | ah I see, and some audio interfaces can lack even that, right? | 19:53 |
| AppAraat[m] | oh, how so? | 19:53 |
| OvenWerks | Many audio interfaces just have hw controls (knobs) instead. | 19:53 |
| AppAraat[m] | yeah I guess mine does only have that | 19:54 |
| OvenWerks | For profesional audio you want the exact audio that leaves the ADC coming into your application | 19:54 |
| OvenWerks | Any level compensation should be done before th adc to prevent clipping | 19:55 |
| AppAraat[m] | That's in case of recording? Does soft mixing / volume control do anything destructive to the digital audio? Thought that was just volume adjustment. | 19:56 |
| OvenWerks | your application should take care of that and deal with any latency that step adds. | 19:56 |
| OvenWerks | Having a level control on the output is less of a problem for long as you have no outboard audio equipment that feeds audio back in to your application | 20:00 |
| OvenWerks | some people use external analog effects because they like the sound | 20:00 |
| AppAraat[m] | in case of external fx, what does it matter whether output is adjusted as long as its compensated back at the input stage? | 20:47 |
| OvenWerks | you loose headroom | 20:47 |
| OvenWerks | loose headroom = starting with 24 bit audio and ending up with 14 bit audio (as an example) | 20:48 |
| AppAraat[m] | hmm I see | 20:49 |
| OvenWerks | Better to use analog level changes after DAC and before ADC | 20:49 |
| AppAraat[m] | that would make the most sense yeah | 20:50 |
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