Fedora JAM 34: GUVCVIEW audio issue when recording videos

[Keith Smith]

This is a strange problem. I record a video with audio using guvcview 
and when I play it back there is no audio (video is fine).  However, if 
I playback a video I created with guvcview under Fedora 33 the audio is 
fine.

guvcview with every combination of audio codec and audio device (both 
from my web cam and from my MOTU audio interface.)

gucview audio level bars (overlaid on video display) indicate audio is 
being received during recording

Playback: VLC and Dolphin.  If I play an older Fedora 33 video vlc shows 
up in carla correctly, if I then try to play a new Fedora 34 video it 
disappears.

Log messages: I'm getting lots of these:

GUVCVIEW: error setting spin value

usb 1-2: Failed to query (SET_CUR) UVC control 10 on unit 3: -32 (exp. 2).

qrc:/qml/ApplicationsListPage.qml:126: TypeError: Cannot read property 
'application' of null

-Keith

[Keith Smith]

I have just verified that guvcview is not working on my Fedora 34 Gnome
workstation either.

I suspect this is a pipewire issue, but so far I have found nothing
recorded anywhere.

This sounds similar:
https://wiki.archlinux.org/title/PulseAudio#guvcview
 

however, although my audio sources are suspended, they show up as
running when guvcview is recording.  I tried to make changes to alsa-
monitor.config to disable suspend, but that did not seem to work.

I'll continue to investigate and/or submit a ticket somewhere if I can
debug this further.

-Keith





On Wed, 2021-06-02 at 15:05 -0700, Keith Smith wrote:
>  This is a strange problem. I record a video with audio using
> guvcview
>  and when I play it back there is no audio (video is fine).  However,
>  if I playback a video I created with guvcview under Fedora 33 the
>  audio is fine.
>  guvcview with every combination of audio codec and audio device (both
>  from my web cam and from my MOTU audio interface.)
>  gucview audio level bars (overlaid on video display) indicate audio
>  is being received during recording
>  Playback: VLC and Dolphin.  If I play an older Fedora 33 video vlc
>  shows up in carla correctly, if I then try to play a new Fedora 34
>  video it disappears.  
>  Log messages: I'm getting lots of these:
>  
>  GUVCVIEW: error setting spin value
>  
>  usb 1-2: Failed to query (SET_CUR) UVC control 10 on unit 3: -32
>  (exp. 2).
>  
>  qrc:/qml/ApplicationsListPage.qml:126: TypeError: Cannot read
>  property 'application' of null
>  
>  
>  
>  -Keith
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