Re: [LAD] El-Cheapo software-only equivalent
Hi, last night i finally managed to try jackd+alsa_in and yes, it works! I used an intermittent beep as a test signal. One thing i've noticed, is that the master stream is about 450-500 frames early in respect to the slave streams, while the gap among the 3 slave streams is within 35-40 frames. I'll try to tune things up a bit, and see if it get better. theoretically your tool could achieve better sound quality than alsa_in, because it doesnt need to be realtime. (it could also do perfect phase alignment) ...hmm, it would require some serious math skills that i don't have :-( And moreover, i don't think it would make much sense to seek for sound quality in this context. It is enough to be able to get something barely decent, using only some junk computer parts that were laying around in your attic (...the first version was able to record 4 channels on a Pentium 166 with 24MB of ram :-D ) so the basic question is, if you are still motivated to continue working on it yeah, actually, i had already stopped working on the core functionality of my program because it was just good enough for my purpose. Now that i know of the existence of alsa_in, i don't think i'm going to release a new project to confuse people even more. Instead, now i was wondering if it could be useful to move the alsa_in functionality to a lower level, like an alsa plugin. But from what you said, i guess the alsa_in algorithm prefers the always-on behaviour of jack (it starts capturing immediately as you start the daemon), instead of the start-stop behaviour of a typical pure-alsa recording application. So, i think the answer is no, and alsa_in is simply the perfect tool i've never heard of before! Aaargh :-D (...well, i started putting together my program in dec-2008, so maybe it just wasn't there at the time...) thanks very much to all of you. i'll see if i can create some documentation to make that alsa_in/alsa_out tools less ignored, instead of releasing a new software. Obviously, with all the proper disclaimers stating that it's not a substitute for a real multitrack ;-) bye alberto ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
Re: [LAD] El-Cheapo software-only equivalent
On 21/07/10 09:43, Arnold Krille wrote: So please, if you create homepage for the app, state the problem and the fact that your (nice!) app is not a solution but only a patch to the problem... :-D eheh, yes yes i will... i can even provide a sample recording that clearly shows the problems of this approach: basically, wiring all the inputs to the same white noise signal and recording it, shows some random phase shifts in the mixdown, and the hi freqs just sound bad. But, when i record from independent mics, actually crappy mics (cheap electret cartridges), in a room with lots of reverb, and lots of other problems, that problem seems less evident. Anyway, now i'll try to use that alsa_in tool that Adrian mentioned before; if it has the same functionality, i'll use that instead. It's strange, there doesn't seem to be very much information about it... thanks for pointing out. Thank you all for the replies Alberto ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
[LAD] El-Cheapo software-only equivalent
Hi all, i'm new to this list. I'd like to ask some advice about a small multitrack recorder program i wrote, and have been using for some time. Basically, what it does is to: - simultaneously capture sound from several consumer-grade soundcards. - use libsamplerate to stretch the audio streams, re-syncing them to the one chosen as master. The stretch ratio is continuously re-calculated to make the overall frame count of the stretched stream match the overall frame count of the master. - write the corrected streams plus the master stream to parallel .wav files using libsndfile. The purpose is the same as the quite famous El-Cheapo Howto ( http://quicktoots.linuxaudio.org/toots/el-cheapo ), just with no soldering involved :-) Of course, i know the solution is far from perfect, but i use it to record some friends of mine who play in a blues/punk band, and the result is not that bad. Now, the question is: do you think this piece of code can be of any interest for someone out there? Do you think i should i publish it on an open source repository ? Or maybe there's already some other software i'm not aware of, that does the same thing? thanks for your patience, please excuse my bad english. bye alberto ___ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
