Results 1 to 7 of 7

Thread: time lapse with vlc

  1. #1
    Join Date
    Jun 2011
    Location
    Australian in New York
    Beans
    31
    Distro
    Ubuntu 11.04 Natty Narwhal

    Question time lapse with vlc

    Hi everyone,
    I am still very new to Linux based systems, so pls be gentle!

    I am trying to make a time lapse video currently with vlc. I have been doing lots of reading on this topic & have made many clumsy attempts, all of which have failed.

    So far I have the webcam working (as I can see myself) and can manually take snapshots in vlc & locate them in my Pictures directory..
    But I am having a lot of difficulty automating the process.

    The command line string I found to use is this
    Code:
    cvlc v4l2:// :v4l2-dev="/dev/video0" -V "image" --image-out-prefix img --image-out-format jpg --image-out-ratio 10 --v4l-fps 30
    So, do I name the webcam, or do I have to figure out the name issued to it by the system?

    Very confused!

  2. #2
    Join Date
    Jun 2011
    Location
    Australian in New York
    Beans
    31
    Distro
    Ubuntu 11.04 Natty Narwhal

    Angry Re: time lapse with vlc

    So I've got the device name part sorted out. I can get the webcam to turn on, but the output to file is not working.
    Here is the code and the output
    Code:
    ccvlc v4l2:// :v4l2-dev="/dev/video0" -V "image" --snapshot-path ~/home/ross/webcam/ 
    
    VLC media player 1.1.9 The Luggage (revision exported) 
    Blocked: call to unsetenv("DBUS_ACTIVATION_ADDRESS") 
    Blocked: call to unsetenv("DBUS_ACTIVATION_BUS_TYPE") 
    [0x9cca9c4] dummy interface: using the dummy interface module... 
    [0x9cff6dc] main video output error: video output creation failed 
    [0x9cce7fc] main decoder error: failed to create video output
    Pls help!!

  3. #3
    Join Date
    Jun 2011
    Location
    Australian in New York
    Beans
    31
    Distro
    Ubuntu 11.04 Natty Narwhal

    Angry Re: time lapse with vlc

    Ok, so Ive learned that there is no video output module called image. So here is the new code, and its output.
    Code:
    vlc v4l2:// :v4l2-dev="/dev/video0" --vout ~/ross/Videos/webcam
    VLC media player 1.1.9 The Luggage (revision exported)
    Blocked: call to unsetenv("DBUS_ACTIVATION_ADDRESS")
    Blocked: call to unsetenv("DBUS_ACTIVATION_BUS_TYPE")
    [0x8e93914] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
    Blocked: call to setlocale(6, "")
    Warning: call to srand(1308058681)
    Warning: call to rand()
    Blocked: call to setlocale(6, "")
    
    (process:4250): Gtk-WARNING **: Locale not supported by C library.
       Using the fallback 'C' locale.
    Blocked: call to setlocale(6, "")
    [0x921f5ac] main video output error: video output creation failed
    [0x920f494] main decoder error: failed to create video output
    So, the webcam is turning on, VLC is opening, but its failing to create video output. Can anyone offer any suggestions as to why?

  4. #4
    Join Date
    Jun 2011
    Location
    Australian in New York
    Beans
    31
    Distro
    Ubuntu 11.04 Natty Narwhal

    Re: time lapse with vlc

    So after playing around with some different commands, Im getting the webcam to switch on as before, vlc is opening & I can see myself in the webcam. However, it is not taking snapshots, as no files are being created in the specified directory , and I cant figure out how to get it to save an image every x frames, to be used for time lapse.
    Here is the code and its output
    Code:
    cvlc v4l2:// :v4l2-dev="/dev/video0" mediadirs s video_dir --snapshot-path ~/ross/Videos/webcam --snapshot-prefix img --snapshot-format jpg
    VLC media player 1.1.9 The Luggage (revision exported)
    Blocked: call to unsetenv("DBUS_ACTIVATION_ADDRESS")
    Blocked: call to unsetenv("DBUS_ACTIVATION_BUS_TYPE")
    [0x89c3784] dummy interface: using the dummy interface module...

  5. #5
    Join Date
    Jun 2011
    Location
    Australian in New York
    Beans
    31
    Distro
    Ubuntu 11.04 Natty Narwhal

    Smile Re: time lapse with vlc

    I got it working, the code I used was:-
    Code:
    cvlc v4l2:// :v4l2-dev="/dev/video0" --video-filter=scene --vout=dummy --aout=dummy --intf=dummy --scene-format=png --scene-ratio=50 --scene-prefix=snap --scene-path=/home/ross/Videos/Webcam/web4 v4l2:// vlc://quit

  6. #6
    Join Date
    Jun 2011
    Location
    Australian in New York
    Beans
    31
    Distro
    Ubuntu 11.04 Natty Narwhal

    Re: time lapse with vlc

    I have found with Lubuntu & VLC 2.0.4 that the required terminal command is
    Code:
    cvlc v4l2:// :v4l2-dev="/dev/video1" --video-filter=scene --vout=dummy --aout=dummy --intf=dummy --scene-format=jpg --scene-ratio=10 --scene-prefix=snap --scene-path=/home/ross/Videos/Webcam v4l2:// vlc://quit

  7. #7
    Join Date
    Feb 2007
    Beans
    23,542
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: time lapse with vlc

    From the Ubuntu Forums Code of Conduct.
    If a post is older than a year or so and hasn't had a new reply in that time, instead of replying to it, create a new thread. In the software world, a lot can change in a very short time, and doing things this way makes it more likely that you will find the best information. You may link to the original discussion in the new thread if you think it may be helpful.
    Thread closed.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •