Das Werkstatt

Bay Area Video Coalition's (BAVC) "QCTools" is an amazing piece of software quality control for analogue video source material. What few know is, that QCTools' analysis algorithms are all implemented directly in FFmpeg's libraries. Therefore, the "FFprobe" commandline tool can b...

btw, same goes for kdenlive: If you try to run x86 (32bit) binaries on a 64bit machine, you also get misleading "file not found" error message. For example: $ ./start-kdenlive returns: Way to run = Normal running kdenlive ./start-kdenlive: line 222: /media/Data/JobsToDo/OSCAL/install/kdenl...

[PROBLEM] I just downloaded the most recent version (15.02.02) of Shotcut video editor on Xubuntu 12.04. Usually you just extract the .tar.bz2 archive and double-click the "Shotcut.desktop" file to start it. In my case, nothing happened. It didn't start, but it also didn't show any error ...

Since 2013, FFmpeg can create the "Peak Envelope Chunk" (levl) in Broadcast Wave Files (BWF) . To see if and which options your FFmpeg version supports, use the following command: $ ffmpeg --help muxer=wav full The NOA Audio Solutions archiving systems uses this envelope chunk without payl...

[PROBLEM] On a 3-node glusterfs v3.4.6 setup on Debian 7 (Wheezy), I got " /var/log/glusterfs/etc-glusterfs-glusterd.vol.log " flooded with the following error/warning about "Connection refused" ever 3 seconds (!): [2015-03-23 12:54:47.965886] I [glusterd-handler.c:2172:__gluste...

HowTo list all Samba accounts and their details A great feature of having a GNU/Linux box as storage shared using Samba is, that not every system account is automatically "available" as Samba login. Of course, this is also another point of confusion and failure. Therefore, here's some inf...

HowTo add persistent, reboot-safe routing table entries on GNU/Linux systems On Debian (v6, v7): 1) Edit the file "/etc/network/interfaces": Edit or add the corresponding entry for the interface you'd like to define a new route for. 2) Add your desired routing table entry at the bottom of...

HowTo remove a VM-client from a libvirt KVM host, using "virsh" 1) Start the "virsh" shell: As root (or using "sudo"), run the following command on the KVM host: $ virsh 2) Shutdown the client: You can get a list of all clients on that KVM host: list --all It'll return...

Gluster offers several parameters per volume to be set/tuned. The version we're currently working with is glusterfs v3.4.6 (Debian 7, RHEL 6.6). A list of available options (at least vor v3.2) can be found in the Gluster.org community wiki: Gluster 3.2: Tuning Volume Options More information is avai...

[PROBLEM] Our GlusterFS share was filled up almost completely, when I suddenly got I/O errors on directory listings, not showing some of the folders on the bricks. Checking /var/log/messages, gave hints that XFS seems to have troubles: Mar 19 04:39:15 vm-gluster-1 kernel: XFS: Internal error XFS_WA...

[PROBLEM] For some (yet unknown) reason, I've created a folder on my gluster share that's behaving strangely... After having the same files on multiple bricks, showing them multiple times when listing over mounted glusterfs, I decided to remove it and copy it again. I've had to remove it on brick-l...

[PROBLEM] I've had our glusterfs server mounted on Debian 7 without problems. After unmounting it, and changing some network configuration settings on the Gluster server (v3.4.6, RHEL 6.5), I suddenly get the following errors in /var/log/glusterfs/ logs: 0-glusterfs-fuse: failed to exec fusermount:...

[PROBLEM] After installing "ssh-askpass-gnome", I was greeted with another error message: Verbindung mit libvirt nicht möglich: Ende der Datei beim Lesen von Daten: sh: nc: command not found: Eingabe-/Ausgabefehler Verify that: - The 'libvirt-bin' package is installed - The 'libvirtd' dae...

[PROBLEM] Tried to connect to a KVM virtual machine client, using a fresh install of "virt-manager" on Ubuntu 12.04. The connection was kvm over SSH, but I got the following error message (sorry. German): Verbindung mit libvirt nicht möglich: Kann keine Daten empfangen: ssh_askpass: exec(...

NOTE: This is not finished! Here are some notes about a working analogue playout setup, using Ubuntu 12.04 LTS (Precise Pangolin) and Shotcut (v13.10.07) for video signal chain signal tests ( DVA-Fidelity ) 1) Blackmagic output settings: Multimedia > Blackmagic Control Panel decklink_studio_4k-sett...