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Audio capture not working with video/audio cap in VLC 2.1.0
Posted: 27 Mar 2012 09:37
by tand
When using vlc 2.0.0 - 2.1.0 (git repo) with USB video/audio capture devices (em28xx-based), sound is not working.
The same setup works with vlc 1.1.12.
When testing with a video file, the sound works for both 1.1.12 and 2.1.0.
The test configuration is using /dev/video0 for video and hw:2,0 for audio.
The distribution is Xubuntu 11.10.
Is this a known problem or should I create a ticket?
Any workarounds or changes that could be applied?
Re: Audio capture not working with video/audio cap in VLC 2.
Posted: 27 Mar 2012 11:27
by Rémi Denis-Courmont
vlc.git works fine here. There is a known bug in PulseAudio input in 2.0.0/2.0.1, but that should not affect ALSA.
Maybe you need to increase live-caching.
Re: Audio capture not working with video/audio cap in VLC 2.
Posted: 27 Mar 2012 14:36
by tand
Tested with different values for live-caching; 300, 1000, 10000, with no effect.
An observation is that sound works when vlc 2.1.0 is installed on top of 1.1.12, but disappears after reboot.
Some kind of changed setup?
Re: Audio capture not working with video/audio cap in VLC 2.
Posted: 27 Mar 2012 14:52
by Rémi Denis-Courmont
I don't know. I have not looked at the ALSA input due to lack of motivation. The PulseAudio input in VLC 2.0.2+ works better for me.
Re: Audio capture not working with video/audio cap in VLC 2.
Posted: 03 Apr 2012 10:36
by tand
Some tests performed on VLC media player 2.1.0-git Rincewind (revision 2.1.0~~git20120324+r1286).
Pulse audio works standalone:
Code: Select all
vlc pulse://alsa_input.usb-TerraTec_Electronic_GmbH_TerraTec_Grabby-01-Grabby.analog-stereo
Alsa audio also works:
Video capture without sound also works:
Code: Select all
vlc v4l2:///dev/video0:standard=PAL
However, when trying to combine v4l2 and pulse, no sound is heard and the video is stuttering.
Code: Select all
vlc v4l2:///dev/video0:standard=PAL --input-slave=pulse://alsa_input.usb-TerraTec_Electronic_GmbH_TerraTec_Grabby-01-Grabby.analog-stereo
Do I use the wrong arguments for input-slave or is this problem related to ticket #5068 (V4L2 and ALSA capture do not synch)?
Changing live-caching does not seem to help either.
Also tested yesterday on a freshly built checkout from git (needed to revert commit 4c16bb9f49017f115675cbba8c6874db05955573 in order to build). The result was actually worse as I got a blue-tinted video and no sound. Might be some v4l2-header mismatch, though
Re: Audio capture not working with video/audio cap in VLC 2.
Posted: 03 Apr 2012 11:05
by Rémi Denis-Courmont
Looks correct. Works fine here; cannot reproduce. Patch welcome.
Re: Audio capture not working with video/audio cap in VLC 2.
Posted: 03 Apr 2012 11:10
by tand
@Rémi
May I ask, which Linux distribution do you run?
Re: Audio capture not working with video/audio cap in VLC 2.
Posted: 03 Apr 2012 11:32
by Rémi Denis-Courmont
That would be Debian Sid. But I believe the bug depends on the kernel drivers and the actual hardware rather than the distribution.
Re: Audio capture not working with video/audio cap in VLC 2.
Posted: 05 Apr 2012 12:58
by tand
Additional feedback; Hauppage USB-Live 2 works out of the box with Xubuntu 12-04 Beta 2 and VLC 2.0.2 Twoflower (revision 2.0.1+git20120404+r151).
Sound does not work on Terratec Grabby and Dazzle DVC100.
Also tested on VLC media player 2.1.0-git Rincewind (revision 2.1.0~~git20120401+r1309) with the same result.
Re: Audio capture not working with video/audio cap in VLC 2.
Posted: 05 Apr 2012 14:13
by Rémi Denis-Courmont
As I said, I cannot reproduce your problem with my hardware. You are going to need to investigate this yourself, I cannot help you at this stage.
Re: Audio capture not working with video/audio cap in VLC 2.
Posted: 05 Apr 2012 17:03
by tand
I will use the working interface at the moment and commence with further troubleshooting on the other interfaces if needed.