The VideoLAN Forums

I have a Dell Inspiron 830 with Avermedia OEM capture card M779 PCIe Audio/Video Capture. OS = Vista home premium.

My purpose is to stream TV over my LAN with far more flexibility than MMC. The problem occurs also with simple screen output, so I'll use this in the sample command line.

The Command line is: The video displays fine but I have no audio. Tried adev="none", same result.
The vdev can be reduced to nothing (""), even further simplifying the command line.

The message panel says (excerpt):

dshow debug: found existing route for output 0 (type 12) to input 0 (type 1)
dshow debug: crossbar at depth 0, found route for output 0 (type 12) to input 0 (type 1)
dshow debug: filters connected successfully !
dshow debug: MEDIATYPE_Video
dshow debug: selected video pin accepts format: YUY2
dshow error: no capture device was detected
dshow error: can't open audio
dshow debug: crossbar at depth 0, routed video output 0 to video input 0
dshow debug: crossbar at depth 0, routed audio output 1 to audio input 5
dshow debug: Playing...

I tried the latest VLC nightly build (v9.0), the problem remains identical.
Also tried all possible dshow-* options, same result.

Other programs don't show this problem. In VirtualDub the sound is OK. I also constructed a filter graph using graphedit, and this also is OK. The graph is straightforward.

I'm completely in the dark about possible causes.
Anyone any ideas...?

Hello,

It seems that you got hit from the same problem like the user SpikeX reported some days ago here in the forum - I'am working currently on this.

Can make a screenshot of your DirectShow Graph? - which pins you connected and so?
I think your problem is that you can't choose your videodevice as audio device? right?
(there are /were several bugs in the DirectShow module for such cases...)

if you are interested to test - a beta - I can provide it to you.

André
--
Atmo
VLC-Windows-Developer

Hi Atmo,

Thx for your reply. My problem looks indeed very similar to that of SpikeX.

I made 2 screenshots of Graphedit graphs.
They are on: http://www.4shared.com/dir/6488002/ff96 ... aring.html

The graph at the right it the one that works. Contrary to its name, the 'Audio/Video capture 1' filter seems to process video only. The audio is handled by its own capture module. Then the question is: for what purpose are the audio pins on the a/v capture filter? Would this arrangement prevent VLC (or directshow) from creating the correct graph?

The other screenshot shows what happens when I try to connect in the 'expected way' (crossbar to a/v capture). As you can see, the connection cannot be made.

As another test I ran VLC and filled in a bogus name (like zzz) as vdev and nothing as adev. There was the audio (with no video)! Strangely, the message list kept saying it didn't find any audio device.

If you have a test version of VLC I'll be happy to try it. If I can do anything else to help solve the problem, just ask,

Paul

you have a pm from me - with details for downloading. Did you read?

The cause of the problem is finally identified (in cooperation with Atmo). Thanks a lot Atmo!

It's a Vista specific problem, a side effect of a new 'feature': Vista senses if an audio cable (e.g. a microphone) is connected or not to any sound input. If not, Vista hides the sound input device.

VLC was not prepared to get an empty list and behaved incorrectly as a consequence.

The confusing behavior is not limited to vlc: I tried Audacity too. If you try select the audio source (preferences / audio i/o / recording device) before you plug in the cable, Audacity shows an empty list!! So you must connect your mike or other audio source before selecting the source.

The VLC developers are working on it.

Paul

HI-

I see it has been about a year later from the last post on this thread. I have the same problem, TV capture card -- No audio.

Has the VLC developers developed a fix for this issue?

I am running Vista Home Preminum an VLC 0.9.8a.

Thanks,
Dick

Has the VLC developers developed a fix for this issue?

Not yet.

Is VLC development team planning on a fix?

Atmo was/is working on this.

any "good news" about this? :-/

I haven't heard any news about this.

Oh man, two years have gone by and this issue isn't fixed?
I'm running the latest (1.1.15 the luggage) and this problem still exists...
Got a new USB capture card, wanted to use VLC for it but instead I have to use the provided (ugly) program. no fun.

Atmo: Do you still have a test version?