No audio from Video capture device EasierCAP. Continuous signal.
Hi all.
I've been trying for several days to get the audio from the EasierCAP device to reach the output. There is audio at the RCA audio port - checked with headphones and an oscilloscope. Pavucontrol shows a continuous audio level, even if the video is stopped.
When the video is started, some variations are visible, added to the constant level.
I couldn't find an explanation for the round symbol just before the MS210X title, but it doesn't seem to be sensitive.
I tried VLC, mplayer, and other players, each with several combinations of parameters. All show video, with correct colors. None have audio.
arecord -l
reports:
...
card 2: C525 [MS210x], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0
...
Note that the C525 is not correct - it belongs to my webcam.
$ ffmpeg -sources |grep video
Auto-detected sources for video4linux2,v4l2:
/dev/video2 [AV TO USB2.0] (none)
/dev/video1 [AV TO USB2.0] (none)
...
Changing the sensitivity of the device changes the constant level, up to a certain point (where I suspect either saturation or some kind of AGC kicks in). The signal on the RCA plug does not show any constant signal. Could there be any internal feedback causing oscillations?
Any suggestion how to proceed (or who to blame ;)?