Re: [Alsa-user] arecord with mutiple aplay
Dear Hui, One idea, not sure it will address your exact issue, but I saw the platform running ALSA might not be powerful enough to cope will all the data. I had the issue with multiple record sessions with different audio cards on Rapberry Pi 3 where one record and simultaneous play worked fine, but when adding new channels shows issues. I since then moved to a new HW (a PC in my case) and been able to cope with 3 simultaneous channels with one play and one record on each. Best, Alexandre Le ven. 2 avr. 2021 à 14:46, Zhou, Hui via Alsa-user < alsa-user@lists.sourceforge.net> a écrit : > Dear community, > > > > I am currently working on streaming one input audio to multiple output > speakers. > > > > Here is the procedures: > > > > mkfifo audio.wav > > arecord -D “input device” audio.wav > > aplay -D ”speaker1” audio.wav > > aplay -D “speaker2” audio.wav > > > > The problem is once I run the “aplay -D “speaker2” audio.wav”, the audio > in two speakers becomes intermittent. > > > > But there is no problem when I only play on speaker1. > > > > Could anyone help me on this? > > > > Thanks! > > > > Best regards, > > Hui > ___ > Alsa-user mailing list > Alsa-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/alsa-user > ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Parallel playback on multiple USB cards
Hi Clemens, Thanks for the hint. On a standard PC all goes well. I have 3 streams playing and 3 recordings at the same time. Regards, Alexandre Le ven. 14 août 2020 à 12:56, Clemens Ladisch via Alsa-user < alsa-user@lists.sourceforge.net> a écrit : > Alexandre Bouillot wrote: > > ... Raspberry Pi > > > > I'm able to address each of the 6 cards independently correctly. > > However, when I'm trying to have a second channel - not to mention the > third - working in parallel with the first, I face problems. > > From what I've heard, the Pi's USB controller has limited bandwidth, and > its > driver is not able to distribute all of it among multiple streams. > > > Regards, > Clemens > > > ___ > Alsa-user mailing list > Alsa-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/alsa-user > ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
[Alsa-user] Parallel playback on multiple USB cards
Hi, I'm trying to set up a system for audio measurements and I'm trying to have a 3 channels solution using one single host (currently a Raspberry Pi, might migrate to x86 later on if needed). I have the one channel system working with two USB audio cards - one for emitting the sound and the other to record the audio output. I'm using shell commands as aplay and arecord. I'm able to address each of the 6 cards independently correctly. However, when I'm trying to have a second channel - not to mention the third - working in parallel with the first, I face problems. I launch aplay instances in asynchronous mode with an & at the end of the command line. As soon as the second instance is running, there is no more sound issued on any boards. As soon as there is only one instance left running, the assigned card is properly emitting the sound. I'm wondering if it is possible to have parallel instances of aplay, each controlling one audio card. Not to spoil anything, the next step will be the same, but with arecord. Thanks for any pointers you can provide. Alexandre ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
