Let me start by saying that for years I've tried to get a "cheap" webcam to work on Linux with very little success, but UVC seems to have changed that. I bought a cheap camera on Aliexpress and it works perfectly - REAL plug-and-play.
BUT that's only true of the video. The audio is unbelievably bad - all I get is a weird squeaky noise. It seems to be picking up just a few random frames and skipping most of the sound. 2 comments: 1 - it's not the hardware because it works fine on a Windows laptop 2 - I do have a work-around - I use the camera for video and a "regular" microphone connected to the sound card. But it would be nice to figure out what's wrong and how to fix the camera's audio. I've tested - and seen (actually heard) the same problem using zoom, cheese, webcamoid, arecord + aplay, audacity. I do see a problem in dmesg, but have no idea what to do about it. Here's the output: [1371995.047030] usb 1-5: new high-speed USB device number 96 using xhci_hcd [1371995.196029] usb 1-5: New USB device found, idVendor=1224, idProduct=2a25, bcdDevice= 1.00 [1371995.196035] usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [1371995.196038] usb 1-5: Product: USB PHY 2.0 [1371995.196041] usb 1-5: Manufacturer: Jieli Technology [1371995.197540] uvcvideo: Found UVC 1.00 device USB PHY 2.0 (1224:2a25) [1371995.199845] input: USB PHY 2.0: USB CAMERA as /devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0/input/input95 [1371995.205917] usb 1-5: failed to read current rate; disabling the check [1371995.208350] usb 1-5: Warning! Unlikely big volume range (=4096), cval->res is probably wrong. [1371995.208351] usb 1-5: [3] FU [Mic Capture Volume] ch = 1, val = 0/4096/1 [1371995.394425] xhci_hcd 0000:00:14.0: WARN: buffer overrun event for slot 55 ep 4 on endpoint [1371995.394428] retire_capture_urb: 1714 callbacks suppressed [1371995.395424] xhci_hcd 0000:00:14.0: WARN: buffer overrun event for slot 55 ep 4 on endpoint [1371995.398423] xhci_hcd 0000:00:14.0: WARN: buffer overrun event for slot 55 ep 4 on endpoint and the "buffer overrun event" is then reported 1700 !!! times after that I've seen many references to retire_capture_urb: XXX callbacks suppressed - for example: https://www.spinics.net/lists/alsa-devel/msg119934.html But I have no idea how to fix this. -- Shlomo Solomon http://the-solomons.net Claws Mail 3.17.5 - KDE Plasma 5.18.5 - Kubuntu 20.04 _______________________________________________ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
