General :: V4l2 - Empty Screen With Capture Device
Jun 23, 2010
I have video capture device "MSI vox USB 2.0", every thing seem to be fine, but none of tv applications show the device, they just show my webcam "/dev/video0"
It's driver is "em28xx" from "v4l2"
I test it with "mythtv, tvtime, xawtv, kdetv, me-tv, v4l2-tool, vlc, mplayer" none of them work detect the device, expect mplayer open a green window with time out message.
The device work fine under windows I test it with vlc-win
lsusb show:
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dmesg | grep em28xx show:
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So i did:
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then:
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Sep 3, 2010
I am trying desperately to create a virtual video device (v4l2), meaning something like /dev/video0 that when accessing it (say, with xawtv or whatever) I get a certain video file played.
I am trying to do this with vloopback. After doing modprobe vloopback, the vloopback input device declared is /dev/video0 and the output device is /dev/video1.
I am trying to do this:
Code:
mencoder vid.avi -nosound -vf scale=320:240 -ovc raw -of rawvideo -o /dev/video0
and then to view the movie with this:
Code:
xawtv -c /dev/video1
[Code].....
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May 9, 2011
I want to make a demo of a 3d app I'm writing, but I don't know of any good screencasting software like it that runs on Linux.
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Mar 19, 2010
Suggest me a good screen capture utility software for fedora?
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Jun 1, 2011
I need to capture from my webcam. It has a mic too.I can specify video input device as /dev/video0.I specified input audio device as /dev/dsp2 ( OSS device, corresponding to USB Webcam), Now VLC throws an error, "VLC is unable to open the MRL 'alsa:///dev/dsp2'. Check the log for details".Thinking it wants an alsa device, I specify device as /dev/snd/pcmC2D0c. (got it from kinfocenter and dolphin). Now again an error, "VLC is unable to open the MRL 'alsa:///dev/snd/pcmC2D0c'. Check the log for details.".I try with any device, the same error. I have added myself to audio device so that I can read/write to the mentioned devices.I see no way of switching VLC to use OSS. And I see no information (documentation on net) on it's expected device listing for audio.
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Jan 6, 2009
Got a Ubuntu system. Have a device on my LAN that can send Syslog messages.
I would like to:
1. Capture these specific syslog messages.
2. Keep them separate from any other syslog activity on the Ubuntu system.
3. View these syslog messages later.
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Feb 5, 2010
Hey I'm looking for something to grab a section of the screen ... like to allow me to drag a rectangle around a portion of the screen and when I release, capture only that -- in to the clipboard would be fine or at that point to a image file format which I could save on the file system.
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Feb 11, 2010
I have been trying to get tvtime or any tv package to work with my Pinnacle PCTV HD usb but I have not had success. I have correctly installed every driver imaginable. So, here is what it what it comes down to: When I open tvtime it says "cannot open capture device /dev/video0" and the screen is blue. But my usb PCTV HD stick is NOT /dev/video0 so the question is how can I get tvtime to look for the usb tv tuner rather than video0?
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Jan 22, 2011
I'm trying to view the output of a dv firewire capture device (advc-100) fullscreen through vlc. I've read of people being able to do this but a detailed explanation of how eludes me.
I'm running Ubuntu 10.10 and VLC 1.1.4
The error message I'm given after trying to open through 'media>open capture device>play' is;
Quote:
Your input can't be opened: VLC is unable to open the MRL 'v4l2:///dev/ffc1/'. Check the log for details.
(and I can't find the log)
I'm not even sure if I've got the device name right so I ran lspci from the command line which gave the following output (and I still can't work out what it is);
Quote:
[ 0.008410] ... event mask: 000000000003ffff
[ 0.014418] ACPI: Core revision 20100428
[ 0.020016] ftrace: converting mcount calls to 0f 1f 44 00 00
[ 0.020023] ftrace: allocating 21756 entries in 43 pages
[Code].....
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Dec 18, 2010
I've made a lot of progress getting my easycap 2.0 usb capture device to work with ubuntu 10.10. I've got the picture up any everything works great. But about a minute into the stream it just freezes, I need to go into "playback" and either pause then play, or click "next", it then refreshes and works again for another minute or so. I'd believe it if someone says faulty hardware because the easycap is cheap, but I don't think that's the case. Additionally, is there any way to set VLC so that when I open it, it automatically opens with my video capture device (/dev/video0) so that I don't have to go into the options and change it every time?
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Jan 4, 2011
Trying to install the drivers for my blackmagic intensity pro capture device and I cannot get the driver to install I get an error in the ubuntu software center saying:
There seems to be a programming error in aptdaemon, the software that allows you to install/remove software and to perform other package management related tasks. Please report this error at [URL] and retry.
Details:
Traceback (most recent call last):
File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 768, in simulate
return self._simulate_helper(trans, status_path)
File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 851, in _simulate_helper
size = int(deb["Installed-Size"]) * 1024
ValueError: invalid literal for int() with base 10: ''
I have the latest ubuntu fully up-to-date.
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Feb 24, 2011
I'm getting some jitter when capturing via RCA or S-Video from an em28xx device. Input type is PAL, other than that I haven't fiddled with mplayer or vlc's options (vlc only sees the RCA input, mplayer sees both)
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Mar 22, 2011
I have two sound devices, an internal audio device on my motherboard and an external USB devices, which came with my headset. After upgrading to 11.4, the microphone on my headset ceased to work with my softphone. As it turned out, the softphone used the standard input device, which was defined in the Phonon tab in the KDE System Settings. Unfortunately, when I put the USB Device on top of the default input stack, it doesn't stay there. When I apply the changes and leave the Phonon tab or even enable "Show advanced devices " the stack always resets to its initial order. I was unable to find any kind of config file where Phonon saves this settings.
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Sep 25, 2010
In Ubuntu 9.10, I was successfully able to use my Pinnacle Dazzle DVC 100 (a cheap USB analog video capture device). I use it for backing up old video that is stored on tapes, and it isn't working with my current install of Ubuntu 10.04. When I plug the device in, it should be detected and the em28xx module should be loaded. This fails and /var/log/messages has the following:
Code:
Sep 25 16:13:18 kernel: [1196215.111898] usb 2-2: new high speed USB device using ehci_hcd and address 20
Sep 25 16:13:18 kernel: [1196215.266097] usb 2-2: configuration #1 chosen from 1 choice
[code]....
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Feb 28, 2010
i have ubuntu 9 10 i have been searching in the internet but i have not found a solution, my problem is that i cant capture the screen with screen shot key (ptr sc) my keyboard has it under the key home, so in windows i have to use the
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Jan 24, 2010
I'm making an attempt to install drivers for my easycap dc60 USB video capture device. Someone was good enough to make a driver project on sourceforge. Problem is I cannot get it compiled.
Code:
Building
make[1]: Entering directory `/home/jan-bart/Download/easycap_dc60.0.4/src'
make -C /usr/src/linux-headers-`uname -r` M=/home/jan-bart/Download/easycap_dc60.0.4/src modules
make: Entering an unknown directory
make: *** /usr/src/linux-headers-2.6.31.8-0.1-desktop: No such file or directory. Stop.
make: Leaving an unknown directory
[Code]...
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May 17, 2011
I found a following codes along with headers from the link given below,
http://v4l2spec.bytesex.org/spec/capture-example.html
I connected the webcam and compiled the program successfully without any error. When I try to RUN the program I could see some strange things happening but no output. I could see a camera is detecting but I could not see any display on the screen.Here is the compile and execution result of my code.
As you see my output, It just prints a dotted line and stops the execution automatically. While printing the dotted line, I could see my webcam lights switch on for sometime but no display on the screen.
The idea is I need to display and run the webcam on the VLC player.
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May 11, 2009
I am trying to develop an application that uses webcameras (in jaunty), so I found this code here, which gives examples: [URL]. I compiled it on my computer (which has a built in webcam on top that I know works, tested it and it worked in luvcview) and then tried to run it. I get an error message that says:
Cannot identify '/dev/video': 2, No such file or directory
I have located the part in the program where this comes from:
static void
open_device (void)
{ struct stat st;
if (-1 == stat (dev_name, &st)) {
/*dev_name is "/dev/video" btw, defined in main*/
fprintf (stderr, "Cannot identify '%s': %d, %s",
dev_name, errno, strerror (errno));
exit (EXIT_FAILURE);
}
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Jun 26, 2009
I'm having problems with the screen capture utility in Fedora 11. Everytime i capture a screenshot, it looks like this:[url]
I've tried turning off Compiz, but that doesn't do anything. I suspect it may have something to do with the kms (I have an Intel 82855/855GM, which has had issues in beta).
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Mar 27, 2010
I wonder if there is the possibility of getting to press any key and the F6 for example, Fedora starts up a screenshot, equal to application "form screen capture image" in the menu acessories .. The problem is that if I want to do this I have to be opening up the application every time .. and I like to do with was fast, just by clicking F6 or printscreen for example ..
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May 7, 2010
On my Mac, when I press F2, I am able to take a screen shot of a selected area. Is it possible to assign a hot key to do the same thing on my Ubuntu 10.04 PC?
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Nov 1, 2010
I need to take a screen capture while an application is running. The application is a touch screen calibration utility and alt-Prnt Scrn does not work when the calibration utility is active. Is there another way for me to capture the screen while the utility is active?
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May 20, 2011
system - screen/mouse/keyboard/hard drive all freeze. if I am in the middle of video or audio, last second of audio loops. I get a terminal screen (attached).
Also, If there is a step by step overall troubleshooting guide,I would appreciate its location. This did not freeze under 10.10, but I have changed wifi card (changed driver) and loaded VirtualBox from oracle (not Ubuntu - VB not running during freeze)) - no other changes.
Running 11.04, classic gnome
Hardware: AMD Athlon II X4 2.8 GHz Processor
MB - MSI 785gtm-E45
What Ubuntu Sees:
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Apr 7, 2011
My screen capture software, shutter and system's default "take screenshot", do not function normal any more. It can only capture the desktop wallpaper, not any other elements on the desktop, nor any other opened windows. It's just like taking an x-ray picture by passing all the other objects/elements/running programs on top of the desktop wallpaper. Any ideas? I am using Fedora 14 64 bit. The screen capture software were working fine, though.
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Jul 30, 2010
Anyone know of a decent screen capture program for RHEL 5.x?
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Dec 9, 2010
Is there any simple example on how to take a screen cap and save it to a file?
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Jul 5, 2010
I need a bash script that auto captures the screen (every 30 sec) and then realize an archive with those screenshots. The script will allow me to quering by user name and date and time framing and if exists a capture archive, it will display a slideshow that presents the captures of specified time.
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May 16, 2011
I'm trying to capture my desktop screen and audio , before I used xvidcap but after upgrading my system I can not use it and also recordmydesktop anymore these APPs hanged when I try to use them.Now I try to use recorditnow via ffmpeg recorder interface , it work properly in recording the desktop but it does not record the sound , so I tried to add below options to its command -f alsa -ac 2 -i hw:0,0 but it just record sound at the beginning and just for 1 second. Also when I try to capture my desktop with ffmpeg directly from command line with below command I face with same problem!!! ffmpeg -f x11grab -s 1024X768 -r 30 -i :0.0 -f alsa -ac 2 -i hw:0,0 ~/out.mpg
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Mar 26, 2010
I have Ubuntu Server Ed. installed (so no Gnome) and was wondering if it's possible to capture screen shot images?
I'm using Subversion, and need to capture screen shots of some merge collisions you see.
Everything is being done via the terminal.
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Mar 25, 2011
I have installed XVidCap Screen Capture. If I record my screen with XVid Cap Screen Capture there is no sound. But if I record with Desktop Recorder there is sound. What is wrong?
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