Help Needed in FFMPEG Tweaking Please.

[nujinini]

Hi Guys!

I was able to make some video capture using ffmpeg the code of which I posted below.

My question is, would it be possible for me to make ffmpeg take shots every 3 seconds or so instead of a continues video? Thanks!

jun@jun:~$ ffmpeg -t 00:00:30  -f video4linux2 -s 128x96 -r ntsc -i /dev/video0 -f alsa -ac 2 -i pulse -qscale 3 sample_output.avi

[atreyu]

i don't know much about ffmpeg, but you could do it with a bash loop, i think. something like this:

#!/bin/bash

# how long to run (in seconds)
max=30

# how frequently to take a picture
int=3

declare -i x=1
until [ $x -gt $max ]; do
  imgfile="test_$(printf "%02d" $x).png"
  ffmpeg -f video4linux2 -i /dev/video0 -vframes 1 $imgfile
  sleep $int
  x+=$int
done

i left out the other ffmpeg options, you can add in what you need, but some of those options won't work w/writing to an image file. i don't have a video device, btw, so i can't test this code. i could only do an x11grab to take a video screen capture of my X11 display, but it won't let me do snaps for some reason.

[nujinini]

Thanks atreyu!

When I try

#! /bin/bash

It just returns me to the prompt and nothing else happens fyi.

[atreyu]

Thanks atreyu!

When I try

#! /bin/bash

It just returns me to the prompt and nothing else happens fyi.

sorry, nujinini, i should have explained a little further. you want to put all that code into a script then execute that script.

so if your editor is nedit, you could do:

nedit ~/ffmpeg-screencap.sh

then cut-and-paste the code I posted into the editor, then save and quit.

then make it executable:

chmod +x ~/ffmpeg-screencap.sh

then run it:

~/ffmpeg-screencap.sh

[mactruck]

try

bash ~/ffmpeg-screencap.sh