Das Werkstatt

I always keep forgetting where to find FFmpeg's sample video collection.
So here's the link:
http://samples.ffmpeg.org/

For some FFV1-tests, I've specifically used "matrixbench_mpeg.mpg":
http://samples.ffmpeg.org/benchmark/tes ... _mpeg2.mpg

[PROBLEM] After tweaking around on my Debian server, the CollectiveAccess Providence (v1.4) installation suddenly didn't work, and presented only this error message: Error 250: Invalid SQL statement Unknown table engine 'InnoDB' (in Db->mysql->execute()) Request halted. [SOLUTION] Make sure your /t...

[PROBLEM] Fresh installation of CollectiveAccess Providence v1.4 on Debian 7 (Wheezy): Uploading a regular-sized video file, as DublinCore "Moving Image" returns the following error message in the web UI: Cannot save using empty request. Are you using a bookmark? [SOLUTION] Increase PHP's...

[PROBLEM] I have set up a VM-client (RHEL 6.6) on a Debian 7 host. The Debian host had a working network bridge (eth0<>br0) configured, which was assigned as primary network adapter for the RHEL VM-client. This used to always work without problems, but right now the VM-client didn't receive anythin...

In the Debian Wiki article about iptables it is described how to configure iptables rules persistently. So, in order to apply the above mentioned routing/iptables setup in a clean, standardized way, do the following: 1) Enable IPv4 forwarding in "/etc/sysctl.conf" as mentioned above. 2) Ad...

I'm usually connecting the setup ISO image for KVM clients directly on the commandline of the "virt-install" command. However, I now stopped and restarted the VM-client before installing the OS. Restarting the client didn't mount the ISO anymore. Hm. Thanks to the instructions on Mounting ...

[PROBLEM] I tried to connect to a Debian KVM host, using the "Virtual Machine Manager" GUI (virt-manager) on Ubuntu 12.04, but got the following error message: Unable to connect to libvirt: End of file while reading data: ... nc: unix connect failed: No such file or directory: Input/outpu...

[PROBLEM] I've just freshly re-installed a Debian 7 (Wheezy) server as KVM host. When I tried to connect using the "Virtual Machine Manager" GUI - which worked flawlessly on previous setups - I got the following error message: Cannot recv data: Value too large for defined data type Verify...

[PROBLEM]
I'm using KVM virtual machine, and when I ran "virsh list" to list the VM-clients, the list was empty.
"ps aux | grep virt" showed that there was a client running, so I was suspicious...

[SOLUTION]
Run "virsh list" as root/sudo.

[PROBLEM] In my setup, I have 1 physical network with 2 shared IP subnets, and I'd like to assign addresses to both of them by DHCP. The DHCP config for the first subnet is running fine for years, and the 2nd subnet was added later on. Subnets: 192.168.200.x/24 192.168.201.x/24 Since it's clear tha...

I'm running a setup with 3 physically separated ethernet networks, but 5 IP ranges. In order to keep the network documented and avoid confusion, the goal is to hand out almost all addresses by a DHCP/DNS combination. Here's one example network with 2 subnets on 1 physical wire. There are DNS zones c...

[PROBLEM] Imagine the following Gluster setup: 2 Servers (aka "node" or "peer"). Let's call them "A" and "B". A and B are setup independently, but completely identical (=same "volume name"). A is the production pool, B is the asynchronously sync'd b...

Here's how you can list all xattr of a gluster brick: $ getfattr --absolute-names -d -m - /path/of/brick/data The output might look something like this (gluster v3.4.2 / Debian Wheezy): # file: /path/of/brick/data security.selinux="unconfined_u:object_r:file_t:s0" trusted.gfid=0sAAAAAAAAAA...

In a certain mass-capture scenario, I've been using dvgrab with the "-rewind" option , which made it more comfortable to capture tapes that were or were not rewind as they come in. We also wanted to rewind the tape after capture . For this, I'm currently using the tool "dvcont" (...

[PROBLEM] I'm using "molly-guard" to prevent accidential restarts/shutdowns on the wrong machine. Works perfectly, but I've just encountered the case where molly-guard is installed, but I could still do a "sudo halt" without it asking me for a hostname. Hm... :? [SOLUTION] This ...