Fedora :: WebCamStudio- No Loopback Device
Jul 21, 2010
I have extracted the WebCamStudio java application into a folder in my Fedora 13 x86_64 installation. I can run WebCamStudio with the command java -jar "WebcamStudio.jar".
I can successfully select sources and view preview etc. However, the bottom status line permanently states "no output". There is no vloopback device to select in Cheese, camstream, Skype, AMsn etc. Does anyone know how I can get the loopback device to work?
I have added my username to the group "video"
I only have /dev/video0 - should there be another module for the loopback device?
Linux 2.6.33.6-147.fc13.x86_64
WebcamStudio 0.55a
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Nov 22, 2010
The concepts of pseudodevice and loopback device ?
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May 26, 2010
I have the following scenario: I have a file that I want to edit from certain point a certain amount of bytes.
I tried using losetup but failed:
Code:
If I loop the file entirely it works, but that's not helping me. (I'm actually keeping the C option for last since shell programming is less restrictive.
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Jan 13, 2010
I have two ethernet card on my computer, I want to make a TCP or UDP communication between these two cards, so I disable loopback: #ifconfig lo down. but with out loopback I can't even ping an eth from another one. how should I do? I want traffic to really pass eth cards.
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Jun 23, 2011
I am trying to expand my Ubuntu partition into my Windows 7 C: drive, but the win7 partioner will not let me shrink it because of immovable files. Is there anyway for me to but an loopback device in the windows partion, and have Ubuntu boot with that as the root device?
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Sep 24, 2010
This seems like a relatively simple question, but the answer seems to elude everyone: What is the MAXIMUM SIZE of a Linux loopback device (not counting any specific filesystem limitations)? Is it the maximum size of a linux block device?
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Aug 10, 2010
I was wondering if it is possible to create a growing image for a loopback device. Like a file that you create that will grow with the data that is placed on it instead of a file that has to be the size of the entire file system?
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Apr 19, 2010
We�re experimenting with deploying SUSE 10 SP3 systems and adding them to a Windows domain and DNS. Oddly, when we register in DNS, it gets registered under two address: the real IP address, and the address 127.0.0.2. Also, an ip addr command shows that the loopback device lo has two addresses: 127.0.0.1 and 127.0.0.2.
The above behavior is just on SP3. On SUSE 10 SP2, the lo device has only the 127.0.0.1 address, and the system is able to register correctly in DNS.
Do you know what the 127.0.0.2 address signifies, or how to get rid of it?
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Jan 26, 2011
I'm kind of new to programming in Linux & c/c++. I'm currently writing a FileManager using Ubuntu Linux(10.10) for Learning Purposes. I've got started on this project by creating a loopback device to be used as my virtual hard disk. After creating the loop back hard disk and mounting it has the following configuration.
Code: $> sudo fdisk -l /dev/loop0
Disk /dev/loop0: 10 MB, 10977280 bytes
255 heads, 63 sectors/track, 1 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/loop0 doesn't contain a valid partition table Now what I want to do is develop a c++ program to read & write files to this loop back device,which I'm using to simulate an actual hard disk,at the blocks & sectors level. So far I've come up with the following code. But I'm still unable to read files from the hard disk one block at a time.
Code: #include <iostream>
#include <stdio.h>
using namespace std;
int main() {
char block[512]; int length=0;
cout<<"Implementation of the File Handler Read Method..."<<endl;
FILE *f = fopen("/dev/loop0", "r");
if(f == NULL) {
cout<<"Error In Opening the HardDisk File Retuning Error..."<<endl; return -1; }
//Read One Block of Data to Buffer length = fread(block, 1, sizeof(block), f);
/* Do something with the data */ cout<<"Length : "<<length<<endl;
return 0; }
When I run this Program All what I get is the message for NULL. "Error In Opening the HardDisk File Retuning Error...". So I could open the loopback device as a file an access it at the sectors & block level.
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Oct 12, 2010
Why does the loopback interface has such a high mtu? I get it that it needs to work out even large packets, which is logical but why this specific number? I can set the MTU even higher with the ip link command, so it's not a limitation of the variable used.
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Apr 24, 2010
I am new to fedora. In fact I have not even installed it yet. I have been using a different distribution for some time now. But it has just had an update, and with that I lost the ability to have analog loopback. I need it because I need to record sound from my speakers, and my mic at the same time, and my soundcard does not seem to allow them to be mixed (or at least I could never figure out how). I have been using the analog loopback to add the mic to the speaker sound, then splitting the speaker sound to also feed back into the line in. I then recorded from the line in to get both the speaker sounds, and the mic. But now I guess alsa has taken the analog loopback out, so I need to find another way.
So I am trying out distributions, and I decided to try fedora. I am just running the live cd right now, and I found that if I installed paprefs (pulse audio preferences) there was an option to loop the audio to the speakers. However it does not loopback the sound. I tried the same think in linux mint, and it worked, but but after about a min of this, the sound got distorted to the point where I could not even understatnd what I said in the mic. This happened all of a sudden, not a gradual thing, but one second it was fine, the next it was very bad.
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Nov 6, 2009
I wonder why fedora livecd images cannot be booted by grub2 loopback method, which works with ubuntu and debian.i have tried something like this:
menuentry "fedora 11 i386" {
loopback loop /boot/iso/Fedora-11-i686-Live.iso
linux (loop)/isolinux/vmlinuz0 root=CDLABEL=Fedora-11-i686-LiveCD rootfstype=auto ro
[code]...
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Jun 22, 2010
I have a problem with my F13 and wired connections on my Acer TravelMate 2410. When I connect the inet cable it doesn't show it as connected. When I type ifconfig, it shows everything as it should. When I tried to bring up eth0 with ifup eth0, it said that the device is not managed by NetworkManager. I tried to restart nm with service network restart, but it gave this error:
Shutting down loopback interface: Error org.freedesktop.NetworkManagerSettings.InvalidConn ection: ifcfg file ;/etc/sysconfig/network-scripts/ifcfg-lo' unknown
The same error came up for eth0 and Wired_connection_1 (the connection I configured from NM )
When I typed nmcli dev list it gave me:
GENERAL.DEVICE: wlan0
GENERAL.TYPE: 802-11-wireless
GENERAL.DRIVER: ath5k
GENERAL.HWADDR: 00:14:A4:4D:B8:FC
GENERAL.STATE: disconnected
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: unknown
WIFI-PROPERTIES.WEP: yes
WIFI-PROPERTIES.WPA: yes
WIFI-PROPERTIES.WPA2: yes
WIFI-PROPERTIES.TKIP: yes
WIFI-PROPERTIES.CCMP: yes
GENERAL.DEVICE: eth0
GENERAL.TYPE: 802-3-ethernet
GENERAL.DRIVER: 8139too
GENERAL.HWADDR: 00:0a:E4:EB:32:E2
GENERAL.STATE: unavailable
CAPABILITIES.CARRIER-DETECT: yes
CAPABILITIES.SPEED: 10 Mb/s
WIRED-PROPERTIES.CARRIER: off
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Dec 7, 2010
I'm using webcamstudio in firefox on a site called stickam and i set the camera to webcamstudio but it either shows nothing or a frozen gray picture i even tried starting it b4 i start firefox but nothing. my webcam is logitech C250. how to get this working? or give me steps on how to broadcast it on a flash based site?
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Aug 5, 2010
I need to download this [url] and i cant figure out how to install it.
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Jun 30, 2010
i'm actually running linux mint 9 x64, but i decided to come here because the linux mint forums are down.
pretty much, i got fed up with pulseaudio causing the sound in flash videos/animations to be delayed, and after looking for weeks and finding no solution, i decided to dump pulseaudio and go with esound.
everything's gone fine until i decided to try webcamstudio. as soon as i run webcam studio, all audio ceases to work. this means that any videos videos playing in firefox suddenly become silent, and all system sounds are muted. the only way to cure it is to close webcamstudio and then close firefox. then all the sounds come back.
just as a warning, i'd prefer not to reinstall pulseaudio! if my flash videos don't work properly, then i had might as well throw linux out the window.
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Apr 11, 2011
I am probably, over looking a simple option or such, but I can't get WebcamStudio to show my desktop instead of this default preview. I have selected Desktop in source and in output is set to Show Splash Screen preview... But how do I get my desktop instead of the Splash screen preview, and I would like to use this for ustream or justin.tv. Rigth now, ustream sees the option for WebcamStudio, and see the preview, but I can't figure out how to change the preview to the input of my desktop.
This is kinda the Splash Screen Preview
Used these following setups:
url
url
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Feb 28, 2010
For an (art)installation I want a camera (webcam) to stream it's data to another computer with icecast2 server installed (including theora) in the same space. Problem is I need something without a gui.
The webcam is /dev/video0, and I would like to stream the video with vloopback (is working already with 2 pipes) to /dev/video3. If I'm right then I should be able to stream /dev/video4 to icecast.
How can I make the webcam video go into pipe /dev/video3? From [URL] I understand I have to do:
Code:
resize /dev/video0 /dev/video3 320x240 320x240
But then I get:
Code:
Usage: resize [-u] [-c] [-s [rows cols]]
[Code]....
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Jan 6, 2011
When trying to compile the webcamstudio modulae (ws4gl.org) it doesn't give an error, but when I want to modprobe it....
Code:
This is from dmesg:
Code:
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May 6, 2011
I'm running Ubuntu 11.04 and I'm trying to install Webcamstudio through the Software Center but I get this "There isn't a software package called webcamstudio in your current software sources". How do I add this to my software sources?
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Jun 3, 2010
I am using Ubuntu 10.04 and would like to use WebCamStudio with Skype 2.1 beta for ubuntu 32 bit. I though skype displays WebCamStudio as one of the webcams its not able to stream output of WebCamStudio to other person...
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Apr 7, 2011
I am working on an embedded system, which is an USB MSC device that supports some vendor specific scsi commands. I am using FC10 laptop as USB host for testing, and it runs some small apps based on sg3. All has been well for ~ a week. The FC10 laptop is able to communicate with the device and retrieve data. Suddenly, starting from today, the laptop is not able to properly detect the device. When plugged-in, the MSC device is detected as input device (I thought). This is observed from "dmesg" output and changes in "/dev/input/".The device under development is running at full speed. When I connect to winXP, no problem. A windows file explorer pops up, showing the content of the drive.Also, the FC10 has no problem with other USB flash drive (high speed).
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Sep 19, 2009
I am currently using fedora 11 kernel 2.6.29 version, i wanted to write device driver for usb to detect my own device. My project is radio with computer. My fm radio get connected to usb port so i need to write h/w interfacing program.
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Dec 24, 2010
I m facing a problem regarding with postfix, when the user try to send a mail to anyone on the system it loopback to itself i
This is my main.cf file:
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Apr 13, 2011
I am trying to mount a raw/dd image of solaris hdd in Linux with the following command:
Code:
Does Linux have tool for checking ufs filesystem integrity?
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Aug 14, 2009
I installed ZTE MF 626 modem in my F10 with kernel 2.6.27.12-170, i run usb_modeswitch and so far things happened normally. Watching through /var/log/messages it says that F10 detects two port device for this modem: ttyUSB1 and ttyUSB2, and in the sequence it disable port ttyUSB1 BUT Network Manager still set this port.I mean, when i connect via wvdial appointing to ttyUSB2 i get connection, but Network Manager fails to do it appointing to ttyUSB1. How to change device port in Network Manager?
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Jun 28, 2010
Running Fedora 13, I cannot add my HP J4680 through the HP Device Manager. I get an error message saying that the print queue cannot be started and it asks me to restart CUPS. I tried restarting CUPS and adding the device. It did not work. The printer is on my home network wirelessly. I can add it through the CUPS web interface and print, but then I cannot access the scanner. I tried adding the device after it was already added through CUPS, but that did not work. I would like to use the scanner; I don't really care about the fax.
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Feb 15, 2011
I have a server application that uses loopback addresses to open servers on linux machine.
For IPv4 with one line of configuration I can open many servers according to the mask I use for example with 10.10.10.0/24 I can open 254 servers.
How can I do the same for IPv6 ? I am able to add loopback interfaces but only for one host. Is it possible to add for a subnet ?
If not what is the max number of addresses that I can add ?
I also saw that it add the address only to loopback lo and I can add it to lo:3 for example.
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Aug 5, 2010
I've got some old drives using pre-LUKS loopback encryption, and I'm having problems mounting them on OpenSUSE 11.3. What I expected to work, based on past experiences with other distributions, is something along the lines of:
mount -t ext3 /dev/sdc11 tmp -o loop=/dev/loop1,encryption=AES256. When I try this I'm asked for the password, but then get the message "ioctl: LOOP_SET_STATUS: Invalid argument". Anyone have a clue what could be going wrong, or how I can best access these drives from OpenSUSE?
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Apr 20, 2010
I own an Ubuntu Server 9.04 on a remote dedicated server. Since a few days (?) the loopback interface is not 'up' on reboot : I only have eth0 (which works fine).Here is my /etc/networking/interfaces (did not change since server initialization):
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
[code]....
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