Piping...

disruptive · 02-11-2008, 03:06 PM

Hi

I want to convert some image files to animation. But I am having trouble piping the stream of files into the conversion command. Now all my files are named 0.png, 1.png 2.png etc etc. However I cannot simply use a *.png command, as this pulls in files in non numerical order. Now I can pull in files in numerical order with

ls | sort -n

However I want to use the commands on

http://www.pymolwiki.org/index.php/Making_Movies
such as

mencoder -mc 0 -noskip -skiplimit 0 -ovc lavc -lavcopts \
vcodec=mpeg4:vhq:trell:mbd=2:vmax_b_frames=1:v4mv:vb_strategy=0:vlelim=0:vcelim=0:cmp=6:subcmp=6

re cmp=6

redia=3:dia=3:vme=4:vqscale=1 \
mf://*.png -mf type=png:fps=18 -o output.avi

I have no idea how to pipe the output from the ls into the right format such that I can create the image files correctly. How can this be done.

Thanks

BrianK · 02-11-2008, 03:49 PM

Quote:

Originally Posted by disruptive

...
I have no idea how to pipe the output from the ls into the right format such that I can create the image files correctly. How can this be done.

hmm... I can't seem to get that command to run on my machine, but, in theory, you would do what you're trying to do by:

mencoder -mc 0 -noskip -skiplimit 0 -ovc lavc -lavcopts \
vcodec=mpeg4:vhq:trell:mbd=2:vmax_b_frames=1:v4mv:vb_strategy=0:vlelim=0:vcelim=0:cmp=6:subcmp=6:pre cmp=6:predia=3:dia=3:vme=4:vqscale=1 \
mf://`ls | sort -n` -mf type=png:fps=18 -o output.avi

... but I can't test it as, again, I can't run the example at all on my machine.

disruptive · 02-12-2008, 03:55 AM

Aha!

I had already thought of that! However it does not work. The command can be installed under ubuntu. The only way I can now think to do it is to reorder the graphics file like 000000, 000001, 000002 such that I can get them in the right order. Otherwise with the command as it is (without the ls), it just means the frames are out of order. Do you know of a cheap fix, where I can change the filenames such they are ordered explicitly in terms of frame order, 0,1,2,3 etc.

Thanks again.

BrianK · 02-12-2008, 01:09 PM

hrm. Well, if you want to rename them all as a pre-process, that's simple enough:

Code:

#!/bin/tcsh -f

foreach f ($argv)
    mv -v $f `printf "%05d.%s" $f:r $f:e`
end

run it from within the directory full of files, i.e.:

cd /dir/with/files
/path/to/script *