Hardware :: Webcam 'dummy' Device Can Only Be Read By Mplayer
Aug 13, 2009
I'm playing a little bit with OpenCV but the webcam that i have on my desktop isn't app-friendly... so i could not get it working with OpenCV, it's a 0ac8:301b Z-Star Microelectronics Corp. ZC0301 WebCam and it worked out of the box with Cheese and after a little bit of tweak i get it working with camorama also.But some apps, like Skype and OpenCV demos doesn't work, believe me, i tried everything to get it working, i tried even upgrading to a very new kernel.
So i had the idea to create a "virtual" video device and using some app that can read the wcam i could print the wcam's output on such device, which should be compatible and app-friendly, so i would use that device always.
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Mar 19, 2009
Long story short - on my laptop, touch pad is recognised as PS/2 mouse. Everything works (moving, clicking, dragging, vertical scroll). But I often accidental click the pad while typing.Synaptic driver recognises it as ALPS glide point it seems (synclient -m 1 gives me back only x,y difference for the gestures, but X,Y coordinates are always 0,0) - so then I get everything right including disabling mouse on keyboard input - but scrolling doesn't work So I came up with 2 possible ideas - which I don't know how to do/test:1. Perhaps there is a way to disable mouse input while typing without synaptics drivers?2. Create a dummy input device (mouse), and tie synaptics driver to it. Add another input device in xorg.conf to point to the real touch pad as PS/2. And make the synaptics disable "real mouse" by enabling GuestMouseOff option.
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May 6, 2010
I have updated my Ubuntu to Lucid 10.04 from 9.10.
Although my sound disappeared in 9.10 only, I thought maybe upgrading might help, but there is no change.
I guess everything is installed fine.
But still aplay -l command shows "NO sound cards.. "
Moreover the sound preferences shows no hardware, no input and a dummy stereo output.
I have banged my head a lot trying various things written in forums and all but no success.
One more thing : When I test "osstest" , I get sound in both the earphones , but altogether there is no sound. I am very much confused.
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Mar 27, 2010
I finally got audio working on my ubuntu 9.10 desktop... now I am having sound issues watching movies from a network share.The sound device continually randomly changes to "dummy output device" and then there is no sound output. The sound icon dissapears on the toolbar. To get it back and audio to start working I have to $sudo alsa force-reloadIt seems to happen everytime there is a network delay, the movie will stop for a second and then when it plays the sound is gone
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Feb 5, 2010
I got a webcam and it works fine with cheese, skype and many other programs. But with jmf or mplayer it doesn't work.
With mplayer I used this command mplayer tv:// -tv driver=v4l:width=640:height=480:device=/dev/video0
Both jmf and mplayer just give static looking like this [url]
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Oct 15, 2010
My system is playing CD's fine but I just tried a DVD (non-BluRay) and I get that error! I have googled about and though I already had the ubuntu-restricted-packages I didn't have all the gstreamer0.10plugins-bad installed (as seems to be the recommended fix). I now have them and MoviePlayer still gives the same error. I also want BluRay's to be playable and I was investigating that when I thought I would check whether normal DVD's were still working (I'm not sure whether I've tried a DVD since I upgraded to MM). The DVD mounts ok and appears on my desktop with the title.
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Jul 12, 2010
I have installed slackware 13.1 on my friends laptop. Its an msi laptop . dual core 2ghz, 1gb ram nividia 9000 series.etc. everything is fine but after installing mplayer codecs from slackbuild and also xvidcore, i am not able to play avi files in mplayer. It is giving me a fatal error saying. error initializing -vo device. i tried to change the video driver. it was by default xv then i tried X11(xvid) then open gl and open gl with max textures . when i made it to open gl with max textures the video out came but it is lagging with the audio.
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May 23, 2010
I have a Zotac IONITX-F-E motherboard (Intel Atom Dual Core 1.6 GHz + Nvidia ION) -based box with Ubuntu 10.04 64-bit installed. My goal is to play back 1080p video.
I have mplayer installed (which I compiled from source with --enable-vdpau). I try to run mplayer with this command:
Code:
mplayer -vo vdpau -vc ffh264vdpau path/to/myfile.mkv
I get the following message in my terminal:
Code:
Error opening/initializing the selected video_out (-vo) device.
I have libvdpau-dev and libvdpau1 installed.
[Code]....
Before doing all this, I was able to get the nvidia 195.36.24 driver installed, but I am still having some trouble, which may or may not be related.
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Jan 13, 2010
I get that error when trying to open an .flv or .avi file. Anyway to fix it? Here is the output of gui.conf
[Code]...
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Aug 7, 2010
Mencoder has not a support for my webcam.
However "
Quote:
" works flawlessly well.
So option dumpfile in man page is there to help us!
But well the command
Quote:
results in a 0kylobytes files.
How to force mplayer to dump file -tv flow data to file?
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Jan 10, 2010
So my Microsoft Lifecam NX-3000 used to work with 9.04, but I can't seem to get anything from it now (Xubuntu 9.10). It still shows up fine when i enter lsusb, but it won't show up as a video device anywhere else. I have faith that this bug is a simple fix for someone who knows what they're doing, but unfortunately I don't. If it's relevant this is on my aging Toshiba Satellite.
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Oct 15, 2010
I'm having here annoying "problem" with my webcamera. Everytime I want to use it as a microphone it needs to be switched manually in sound settings menu. It's not a big deal but I would really rather let it be switched automatically like plug and play or something like that.
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Oct 5, 2009
i studied the program chardev.c from 'The kernel module programming guide'. The text tells me that by doing a :
1. 'cat' the character device is opened.
2. hi > /dev/hello the character device is written into.
now i wanted to know how to 'read' from the character device !
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Apr 23, 2010
I tried to get 3d hardware support in my FC12 install. I grabbed the latest appropriate drivers from the nvidia website for my Geforce 6800 XT graphics card. I changed the inittab file to boot to command line, ran the .run file as root and ran into a couple errors doing so.
I then proceeded to use yum (which i do like but this is a bad scenario for me thus far) to update my drivers to the suggested kmod-nvidia drivers that exist out there. Once all of the installation was completed I rebooted and got the following error displayed at the top of my screen after the fedora loading bubble disappeared. The system just seems to hand at this point....
"usb 2-1: device descriptor read/64, error -62"
I did a hard boot on the machine and tried again, this time i pressed the esc key to watch the interactive startup screen and noticed that after "enabling local filesysem quotas: [ OK ]" i get a
***Warning -- SELinux targeted policy relabel is required.
*** Relabeling could take a very long time, depending on file
*** system size and speed of hard drives.
This will continue with asterisks across the screen until eventually it stops and then I am stuck as to what to do from here on out. What could possibly be causing all of this mayhem?I have tried to use the fedora core 12 install cd to launch it into "rescue mode" and from the bash command line proceed with modifying my grub.conf to not use the "newly installed kernel (2.6.32.11-99.fc12.i686)" that was installed with yum during my kmod-nvidia driver installation.
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Apr 13, 2011
I need programmer a timer of 10 ms for read/write a USB device
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Dec 18, 2010
I am trying to add/delete files from my HTC Evo through ubuntu via enabling file sharing on the device. Ubuntu detects the drive, and mounts it up so that I can browse/read files off the device. However, I am not able to do any writing to the device because it is mounted as "read-only". The only wierd thing is that it worked last week, and I have not changed any settings on my system. Where should I start? Is the auto-mount for USB drives located in "/etc/fstab"? because here is the contents of that file, and I dont see anything for usb mounts:
Code:
# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
[Code]....
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Mar 4, 2011
I need to change a filename but when I boot up I get the message root device is read-only. Is there a way of changing this so that I can change the filename. I have a Mac Pro running Leopard OSX. The graphics card an NVIDIA 7500GT or driver has failed. It was suggested elsewhere that I change the relevant kext files to filename.kext.old, which I did, now when I try to boot start in OSX I get a message in various languages telling me to restart. I have tried booting in safe mode and from original Installation CD. In Safe Mode I get the same multi language splash screen, from CD I still have the graphic card problem, screen freezes and artifacts appear. So I boot up straight into CLI by holding down CMD-S hoping to be able to change filenames back but it says device read-only.
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Mar 15, 2011
I want to keet some data on windows dir. I have tried the below command and giving the below error.
[root@xyz0044 ~]# mount -t cifs //10.48.64.52/jata -o username=domainv.kumar3,password=xxxx /mnt/backup
mount: block device //10.48.64.52/jata is write-protected, mounting read-only
mount: cannot mount block device //10.48.64.52/jata read-only
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Aug 20, 2010
I'm designing an embedded USB device. When I connect the device to the computer, I get the following messages:
usb 1-3: device descriptor read/64, error 2
usb 1-3: device descriptor read/64, error 2
usb 1-3: device descriptor read/64, error 2
usb 1-3: device descriptor read/8, error -71
usb 1-3: device descriptor read/8, error -71
usb 1-3: device descriptor read/8, error -71
Note that other USB devices work fine. I am fairly certain that the problem is with my hardware. I'd like info on what these error messages mean to help my debug. Searching Google I wasn't able to find any explanations about what these errors mean exactly.
I'm running Cent OS 5.4 with kernel 2.6.18-164.el5 on an i686
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Feb 2, 2011
I'm having issues with getting my USB ports to work on my server. USB keyboards, mice, drives, flash drives, card readers, etc. will not work on this server.
dmesg
Linux version 2.6.18-194.32.1.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Wed Jan 5 17:53:09 EST 2011
BIOS-provided physical RAM map:
[code]...
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Jul 30, 2011
My wife is purchasing a netbook with no internal CD/DVD writing device, so we plan to purchase an external CD/DVD USB-2.0 read/write device. Our local PC shop has the following 3 external USB-2.0 DVD read/write devices:
(a) Samsung DVD-Burner SE-S084F/RSBS [not listed on Samsung site - too old ? ]
(b) LG DVD-Burner GE24NU21 USB2.0 [not listed on LG site - too old ? ]
(c) Super-Multi Portable DVD Rewrite (GP10 Lite USB2.0 Slimline) GP10NB20 (mentions Mac OS/X support, which is encouraging)
None of those are listed in the openSUSE HCL. Has anyone successfully used any of these with GNU/Linux (my google surfing on this revealed no GNU/Linux complaint nor any success stories) ? Or is there another such external USB-2.0 read/write DVD burner device that is recommended ?
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Feb 17, 2011
I used dual booting with Windows Xp and Ubuntu 10.04. Because errors, I reinstall Windows and then I could not enter GRUB, and Ubuntu partition disappear. I tried to reinstall ubuntu using live CD but I could not detect last ubuntu partitions. After I installed fresh Ubuntu on new partition, I got error message like this:
Unable to mount floppy0 Mount: block device /dev/fd0 is write protected, mounting read-only Mount: could not determine the file system type, and none was specified
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Jun 24, 2011
Now i have a problem.I want to used a hid usb device under linux 2.6.11.But i can't know how to used ioctl function to send and receive data to a hid device
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Aug 6, 2010
On one of my machines the DVD/DVDRW/CDROM drive appears as /dev/hdc and is not identified as an optical drive by HAL. It is owned by root: disk and thus no users get permission to read/write in the device (not even those in the cdrom group). This stops playing DVDs, ripping CDs, no notifications appear when a disk is inserted, etc. etc. When I set the permissions for all to read/write from the device then users can access but still no notifications are shown.
On all my other machines the optical drive is identified as /dev/sr0 and is owned by root:cdrom . All have Slack 13.1 . Previously with Slack 12.2 this machine still had the drive in /dev/hdc but the permissions were right (I think because I added it to /etc/fstab with options for users to access it). I believe the problem is down to HAL not setting this drive to the correct group, but how do I fix it? I hate HAL, it has a mind of its own, just like in the scifi movie
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Apr 11, 2010
I am trying to install gnome mplayer and later mplayer codecs.script run
Code:
root@zorro:/home/siawacsh/Downloads/MPlayer/mplayer/slackbuild/gnome-mplayer# ./gnome-mplayer.SlackBuild
gnome-mplayer-0.9.8/
[code]....
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Mar 23, 2011
I have a webcam that don't work with cheese ("no device found"). cheese works with an other camera, so it's not the problem. Googl says the cam should work ([all variants] Alcor Micro Corp. webcam just works - Ubuntu Forums), if the usb numbers mean anything dmesg gives this:
[code]...
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May 22, 2010
I initially thought the problem had to do with the Lucid Lynx upgrade, a lot of people have been reporting similar issues with drive mapping and things along those line. My issue is that an external drive, formatted in FAT32 appears to be corrupted, and overtime begins to read or mounts as 'read-only.'
What I've read, and deduced, is that this is ultimately and issue with the drive. I've backed it up, reformatted, and been able to write to the drive successfully, but I've been moving a lot of files (backing up) and the system has been reporting input/output errors in transferring some files (through the GUI).
The only thing I can think of, is that the device itself is corrupted or damaged, and that I need to be thinking of other back-up options for the future. Any suggestions on disk-doctoring? I'm hoping to do a clean-install of the OS once I back up my files manually.
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Nov 6, 2010
I'm trying to get a webcam up and running and I'm having a few problems. I'm running OpenSuSe 11.3, gnome and I'm using wxCam to view any webcam output. It's an old webcam, output from lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 03f0:171d Hewlett-Packard Wireless (Bluetooth + WLAN) Interface [Integrated Module]
[Code].....
I thought maybe it needs a driver.
Using YaST
hardware
hardware info
usb
Kernel driver: gspca_pac207 the all knowing google said this driver is found in linux kernels from 2.6.28 release, I have 2.6.34.7
[Code]....
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Feb 14, 2011
I have an audio recorder that doubles as a music player. It can play WAV files. So I put in some WAV files and they are out of order, even if they are named numerically. Read somewhere about a little CLI software called fatsort so I installed. The device is located at /dev/sdc. So naturally I write fatsort /dev/sdc, it says something about permission. So sudo fatsort /dev/sdc. Thing is, it says:
Code: sort_fs: Device or resource busy! If I "eject" it (unmount) then it says something about cannot read boot sector or headers. On Windows there is FAT Sorter. It does not work in WINE. So every time I put something in, I have to get to a Windows computer to sort it. It seems like fatsort is the only program that sorts FAT systems in Ubuntu/Linux.
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Mar 3, 2011
This should be a very elementary question. I have a URL like http://SERVERNAME/file.wmv. When I enter it in "Open Location" in gnome-mpLayer it connects to the server and plays the stream. But when I run
mplayer "URL"
in the terminal I get a crazy endless loop of
Playing URL.
Resolving SERVERNAME for AF_INET6...
Couldn't resolve name for AF_INET6: SERVERNAME
Resolving SERVERNAME for AF_INET...
Connecting to server SERVERNAME[xxx.xx.xxx.xx]: 80...
Cache size set to 320 KBytes
I think my usage of mplayer in the terminal is correct, since I can watch other URL's.It's only this specific one that doesn't work (I am not authorized to write the URL because they want it to be private.So my question is: Does anyone know why I get this loop? Or is it possible to see how mplayer is called by gnome-mplayer and what output messages it generates?I use gnome-mplayer 0.9.9.2 and mplayer 1.0rc4-4.4.5 on Ubuntu 10.10.
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