Public bug reported:
Hi,
I'm using VLC to grab my webcamera audio/video input. Everything works
perfectly except in some situations ALSA starts raising too many errors,
when the ambiental light goes low. I narrowed down the exact reason for
that,
The webcam itself can be configured using v4l2-ctl utility, to set
brightness, contrast, etc. Among other options, there are two options
for the expositure: exposure_auto and exposure_absolute. The first one
is used to set auto/manual mode and the 2nd is used to set the value of
exposure time manually. Now, when the ambiental light goes low (dark),
the camera increases aperture (when in auto mode) to cope with the lack
of light. At some point, this error appears repeatedly (roughly every 1
second): "ALSA lib pcm.c:7316:(snd_pcm_recover) overrun occurred".
How can I make this error go away and is this a known bug?
# vlc
VLC version: VLC media player 1.3.0-git Rincewind (revision
1.3.0-git-3-g3082f24)
# dpkg -l | grep alsa
ii alsa-base 1.0.23+dfsg-4 ALSA
driver configuration files
ii alsa-tools 1.0.24.1-3 Console
based ALSA utilities for specific hardware
ii alsa-utils 1.0.24.2-4
Utilities for configuring and using ALSA
# dpkg -l | grep linux-sound-base
ii linux-sound-base 1.0.23+dfsg-4 base
package for ALSA and OSS sound systems
# lsmod | grep snd
snd_hda_codec_realtek 272352 1
snd_hda_intel 26182 0
snd_hda_codec 72799 2 snd_hda_codec_realtek,snd_hda_intel
snd_usb_audio 84784 0
snd_usbmidi_lib 23373 1 snd_usb_audio
snd_seq_midi 12848 0
snd_seq_midi_event 13316 1 snd_seq_midi
snd_rawmidi 23060 2 snd_usbmidi_lib,snd_seq_midi
snd_hwdep 13186 2 snd_hda_codec,snd_usb_audio
snd_pcm 63744 3 snd_hda_intel,snd_hda_codec,snd_usb_audio
snd_seq 45093 2 snd_seq_midi,snd_seq_midi_event
snd_timer 22917 2 snd_pcm,snd_seq
snd_seq_device 13176 3 snd_seq_midi,snd_rawmidi,snd_seq
snd 52798 11
snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_usb_audio,snd_usbmidi_lib,snd_rawmidi,snd_hwdep,snd_pcm,snd_seq,snd_timer,snd_seq_device
snd_page_alloc 13003 2 snd_hda_intel,snd_pcm
soundcore 13065 1 snd
usbcore 124095 8
usb_storage,uas,uvcvideo,snd_usb_audio,snd_usbmidi_lib,uhci_hcd,ehci_hcd
# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 046d:0821 Logitech, Inc. HD Webcam C910
If you need any more info, please let me know. Thanks in advance.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
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https://bugs.launchpad.net/bugs/900503
Title:
ALSA lib pcm.c:7316:(snd_pcm_recover) overrun occurred
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