Dear Alexandre, Thank you for your suggestion!
I found the problem is the FIFO can only be read by one process instead of multiple process, and I have changed to use command "tee" to implement it. Best regards, Hui From: Alexandre Bouillot <alexan...@bouillot.org> Sent: 06 April 2021 11:00 To: Zhou, Hui <hui.z...@kcl.ac.uk> Cc: alsa-user@lists.sourceforge.net Subject: Re: [Alsa-user] arecord with mutiple aplay You don't often get email from alexan...@bouillot.org<mailto:alexan...@bouillot.org>. Learn why this is important<http://aka.ms/LearnAboutSenderIdentification> Feedback<http://aka.ms/SafetyTipsFeedback> 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<mailto: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<mailto:Alsa-user@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/alsa-user<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Falsa-user&data=04%7C01%7Chui.zhou%40kcl.ac.uk%7C1a8b699e3c6e48cbb95008d8f8e2d354%7C8370cf1416f34c16b83c724071654356%7C0%7C0%7C637533000383510486%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=bLQtwCCcsTAgIOCJMcQIs9x8BLu3auds5BiJFiDVfkk%3D&reserved=0>
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