[SOLVED] VLC Time lapse from the cli.

mjolnir · 08-16-2013, 01:48 PM

I've been playing around using VLC media player 2.0.8 Twoflower (revision 2.0.8a-0-g68cf50b) on Ubuntu 13.04 to extract video frames from my webcam feed to make small time lapse videos. I use this command in a terminal to do the extraction:

Code:

vlc --video-filter=scene --vout=dummy --aout=dummy --intf=dummy --scene-format=jpeg --scene-ratio=100 --scene-prefix=$(date +"%b-%d-%y")_ --scene-path=/home/carl/Pictures/Temp v4l2:// vlc://quit --run-time=60

Following result:

Code:

carl@Wizard:~/Pictures/Temp$ vlc --video-filter=scene --vout=dummy --aout=dummy --intf=dummy --scene-format=jpeg --scene-ratio=100 --scene-prefix=$(date +"%b-%d-%y")_ --scene-path=/home/carl/Pictures/Temp v4l2:// vlc://quit --run-time=60 
VLC media player 2.0.8 Twoflower (revision 2.0.8a-0-g68cf50b)
[0x93ef7c0] dummy interface: using the dummy interface module...
[0xb5000958] idummy demux: command `quit'
carl@Wizard:~/Pictures/Temp$ ls
Aug-16-13_00001.jpeg  Aug-16-13_00601.jpeg  Aug-16-13_01201.jpeg
Aug-16-13_00101.jpeg  Aug-16-13_00701.jpeg  Aug-16-13_01301.jpeg
Aug-16-13_00201.jpeg  Aug-16-13_00801.jpeg  Aug-16-13_01401.jpeg
Aug-16-13_00301.jpeg  Aug-16-13_00901.jpeg  Aug-16-13_01501.jpeg
Aug-16-13_00401.jpeg  Aug-16-13_01001.jpeg  Aug-16-13_01601.jpeg
Aug-16-13_00501.jpeg  Aug-16-13_01101.jpeg  Aug-16-13_01701.jpeg

I've tried various iterations but I haven't been able to add %H, %M, and %S to the file name. Anybody have any ideas? Thanks.

mjolnir · 08-17-2013, 08:05 AM

Not quite sure what I was doing wrong yesterday, probably stared at a computer screen for to long, but I simply added %T to the string and got the result I wanted:

Code:

carl@Wizard:~/Pictures/Temp$ vlc --video-filter=scene --vout=dummy --aout=dummy --intf=dummy --scene-format=jpeg --scene-ratio=100 --scene-prefix=$(date +"%b-%d-%y-%T")_ --scene-path=/home/carl/Pictures/Temp v4l2:// vlc://quit --run-time=120 
VLC media player 2.0.8 Twoflower (revision 2.0.8a-0-g68cf50b)
[0x891f758] dummy interface: using the dummy interface module...
[0xb5000958] idummy demux: command `quit'
carl@Wizard:~/Pictures/Temp$ ls
Aug-17-13-08:55:46_00001.jpeg  Aug-17-13-08:55:46_01001.jpeg
Aug-17-13-08:55:46_00101.jpeg  Aug-17-13-08:55:46_01101.jpeg
Aug-17-13-08:55:46_00201.jpeg  Aug-17-13-08:55:46_01201.jpeg
Aug-17-13-08:55:46_00301.jpeg  Aug-17-13-08:55:46_01301.jpeg
Aug-17-13-08:55:46_00401.jpeg  Aug-17-13-08:55:46_01401.jpeg
Aug-17-13-08:55:46_00501.jpeg  Aug-17-13-08:55:46_01501.jpeg
Aug-17-13-08:55:46_00601.jpeg  Aug-17-13-08:55:46_01601.jpeg
Aug-17-13-08:55:46_00701.jpeg  Aug-17-13-08:55:46_01701.jpeg
Aug-17-13-08:55:46_00801.jpeg  Aug-17-13-08:55:46_01801.jpeg
Aug-17-13-08:55:46_00901.jpeg
carl@Wizard:~/Pictures/Temp$ vlc --video-filter=scene --vout=dummy --aout=dummy --intf=dummy --scene-format=jpeg --scene-ratio=100 --scene-prefix=$(date +"%b-%d-%y-%T")_ --scene-path=/home/carl/Pictures/Temp v4l2:// vlc://quit --run-time=120 
VLC media player 2.0.8 Twoflower (revision 2.0.8a-0-g68cf50b)
[0x924c7a8] dummy interface: using the dummy interface module...
^Ccarl@Wizard:~/Pictures/Temp$ ls
Aug-17-13-08:55:46_00001.jpeg  Aug-17-13-08:55:46_01301.jpeg
Aug-17-13-08:55:46_00101.jpeg  Aug-17-13-08:55:46_01401.jpeg
Aug-17-13-08:55:46_00201.jpeg  Aug-17-13-08:55:46_01501.jpeg
Aug-17-13-08:55:46_00301.jpeg  Aug-17-13-08:55:46_01601.jpeg
Aug-17-13-08:55:46_00401.jpeg  Aug-17-13-08:55:46_01701.jpeg
Aug-17-13-08:55:46_00501.jpeg  Aug-17-13-08:55:46_01801.jpeg
Aug-17-13-08:55:46_00601.jpeg  Aug-17-13-08:58:40_00001.jpeg
Aug-17-13-08:55:46_00701.jpeg  Aug-17-13-08:58:40_00101.jpeg
Aug-17-13-08:55:46_00801.jpeg  Aug-17-13-08:58:40_00201.jpeg
Aug-17-13-08:55:46_00901.jpeg  Aug-17-13-08:58:40_00301.jpeg
Aug-17-13-08:55:46_01001.jpeg  Aug-17-13-08:58:40_00401.jpeg
Aug-17-13-08:55:46_01101.jpeg  Aug-17-13-08:58:40_00501.jpeg
Aug-17-13-08:55:46_01201.jpeg
carl@Wizard:~/Pictures/Temp$

Followed by:

Code:

ls -1tr > frames.txt

and then:

Code:

mencoder -nosound -ovc lavc -lavcopts \
vcodec=mpeg4:mbd=2:trell:autoaspect:vqscale=3 \
-vf scale=1920:1080 -mf type=jpeg:fps=20 \
mf://@frames.txt -o time-lapse.avi

Most of this came straight from the web. I would attribute and give links but I got lost in the weeds. :-)