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• How to make a Stop Motion or Time-lapse video with webcam?

  - by Seppo Erviälä

  I have a webcam that works as a v4l2 device. What is the most convenient way to capture either a stop-motion or time-lapse video? N.B. stop-motion and time-lapse are related but conceptually different. Time-lapse is where you take a photo of a scene at a set interval and then combine it into a video (that looks like it's going really fast). Stop-motion is where you control the scene and take an image for every change you make, to form an animation (eg Wallace and Grommit). An application for time-lapse needs to be able to take a photo at a set interval.

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• How to take a screenshot every n second?

  - by Seppo Erviälä

  What software can I use to take screenshots with a set interval? I'd like to take screenshots every 2 second or so. Command-line and GUI are both ok. I'd prefer software that can also resize and compress each screenshot. EDIT: What I realized I really wanted to do was take a screenshot and a picture with webcam at the same time. I ended up doing some python: import threading import os def capture(i): i += 1 threading.Timer(2.0, printit, [i]).start() fill = str(i).zfill(5) os.system("scrot scrot-%s.jpg" % fill) os.system("streamer -o streamer-%s.jpeg -s 320x240 -j 100" % fill) capture(0)

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• What does Ubuntu do when I signal undocking to a laptop?

  - by Seppo Erviälä

  It seems that Ubuntu runs some script or command when I signal that I want to undock my laptop by pressing the undock button on the dock. Most visible thing that happens is that resolution on external display is changed. After prepearing for undock my laptop is still connected to power, VGA-output and audio jacks through dock but not to any usb devices or optical drive. I'm running 11.04 on a ThinkPad X61s with X6 UltraBase. What happens when I signal undocking? This is what dmesg says after pressing undock button: [81459.990682] ata1.00: disabled [81459.990727] ata1.00: detaching (SCSI 0:0:0:0) [81459.991722] ACPI: \_SB_.GDCK - undocking [81460.009462] ehci_hcd 0000:00:1a.7: power state changed by ACPI to D0 [81460.020252] ehci_hcd 0000:00:1a.7: BAR 0: set to [mem 0xfe226c00-0xfe226fff] (PCI address [0xfe226c00-0xfe226fff]) [81460.020265] ehci_hcd 0000:00:1a.7: power state changed by ACPI to D0 [81460.020281] ehci_hcd 0000:00:1a.7: restoring config space at offset 0xf (was 0x300, writing 0x30b) [81460.020309] ehci_hcd 0000:00:1a.7: restoring config space at offset 0x1 (was 0x2900000, writing 0x2900102) [81460.020338] ehci_hcd 0000:00:1a.7: PME# disabled [81460.020346] ehci_hcd 0000:00:1a.7: power state changed by ACPI to D0 [81460.020352] ehci_hcd 0000:00:1a.7: power state changed by ACPI to D0 [81460.020363] ehci_hcd 0000:00:1a.7: PCI INT C -> GSI 22 (level, low) -> IRQ 22 [81460.020372] ehci_hcd 0000:00:1a.7: setting latency timer to 64 [81460.020432] ehci_hcd 0000:00:1d.7: power state changed by ACPI to D0 [81460.040071] ehci_hcd 0000:00:1d.7: BAR 0: set to [mem 0xfe227000-0xfe2273ff] (PCI address [0xfe227000-0xfe2273ff]) [81460.040085] ehci_hcd 0000:00:1d.7: power state changed by ACPI to D0 [81460.040104] ehci_hcd 0000:00:1d.7: restoring config space at offset 0xf (was 0x400, writing 0x40b) [81460.040133] ehci_hcd 0000:00:1d.7: restoring config space at offset 0x1 (was 0x2900000, writing 0x2900102) [81460.040170] ehci_hcd 0000:00:1d.7: PME# disabled [81460.040178] ehci_hcd 0000:00:1d.7: power state changed by ACPI to D0 [81460.040184] ehci_hcd 0000:00:1d.7: power state changed by ACPI to D0 [81460.040195] ehci_hcd 0000:00:1d.7: PCI INT D -> GSI 19 (level, low) -> IRQ 19 [81460.040204] ehci_hcd 0000:00:1d.7: setting latency timer to 64 [81460.040503] ehci_hcd 0000:00:1d.7: PCI INT D disabled [81460.040552] ehci_hcd 0000:00:1d.7: PME# enabled [81460.061657] ehci_hcd 0000:00:1d.7: power state changed by ACPI to D3 [81460.200414] usb 1-4: USB disconnect, address 14 [81462.220088] ehci_hcd 0000:00:1a.7: PCI INT C disabled [81462.220169] ehci_hcd 0000:00:1a.7: PME# enabled [81462.240115] ehci_hcd 0000:00:1a.7: power state changed by ACPI to D3

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• What version was installed? x64 or i686? What's the difference exactly?

  - by Seppo

  Okay, so heres my problem. I recently started migrating several services to individual VMs on my box, using VirtualBox 4.1. I created a new VirtualBox VM with guest type "Ubuntu (64 Bit)". I've already done this before and it worked like a charm. I then installed unbutu server (12.04) from the exact same dvd image. All the time I thought that it should have installed x64. I already put a few hours work into the new VM, migrating the webserver and mail system etc. Today I tried installing a x64 piece of software and it suddenly told me that it needed x64 and I had only i686. I checked uname -a and this is what it gave me: Linux hostname 3.2.0-29-generic-pae #46-Ubuntu SMP Fri Jul 27 17:25:43 UTC 2012 i686 i686 i386 GNU/Linux Any guesses what went wrong? All the time I was thinking I had a x64 system. Any way to move to a "real" x64? I have a second VM on this host which is running x64 just fine .. P.S.: grep --color=always -iw lm /proc/cpuinfo returns lm among the flags.

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• Mac OS X change IP configuration automatically by location (by Wifi network)?

  - by Seppo Sade

  Can Mac OS X be setup to automatically configure its Airport interface with a static IP address when connected to a Wifi network with a certain name, and on all other Wifi networks use DHCP? Currently I'm using the "Locations" feature of the "Network" section in System Preferences to manually switch between two IP address setups. I have a "my static IP" setup, and a default "DHCP" setup. However this requires entering System Preferences to change the Location drop-down each time when switching locations. Can this be automated? Preferably this would be done without third-party software.

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• What video format works both on Windows and all Apple products out-of-the-box?

  - by Seppo Silaste

  What format and encoding should I use for video that would play out-of-the-box on both Windows and all Apple products (iPad, iPhone, etc.)? I know that the correct way to render an animation, is to first render it as images, but this is overkill when rendering short animations of a work in progress for the client to comment on. I have one client that views the vids on Windows and another that views them on iPad and iPhone. I'm hoping I could render just one video instead of rendering in two different formats.

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