How to batch convert entire directory of animated gifs

[ViPeR_930]

Hi,
How do I batch resize animated gifs with imagemagick? I have this script which works for single images but I must specify both the exact image name.

convert {path to image with filename}.gif -coalesce -resize 200x200 \
-layers optimize-frame {output name}.gif

mogrify -path seems to batch process but animations all come out broken with mogrify.

Thanks!

[snibgo]

I'd put it in a loop, so "convert" is called once per gif. When batch-converting a load of images with common elements in the name I always read from one directory and write to a different one.

[fmw42]

Does the same command using convert mangle your animations? I tried a simple animation using mogrify and it worked fine. I did not do the optimize.

What is your IM version and platform? Can you upload your animation to dropbox.com and put the URL here, so others can test your command?

[ViPeR_930]

Than you both for the quick replies.

snibgo, can you tell me how to change my command so it runs in a loop and outputs to a different folder?

fmw42, the convert command I have above works fine for the small batch of animated gifs I tried it with. Mogrify botched everything up. I can test more again tonight. I am using imagemagick 6.7 through SSH on my Centos server.

[fmw42]

IM 6.7 is very old (approx 200 versions old). You would do well if you could upgrade. It could be a bug in such an old version of IM. But if you can provide one of your gif animations as requested above, I can test it in mogrify with 6.9.2.1 Q16 Mac OSX.

#create output directory if it does not exist already

Code: Select all

cd to inputdirectory
list=`ls *.gif`
echo "$list"
for img in $list; do
convert "$img" -coalesce -resize 200x200 \
-layers optimize-frame "path2outputdirectory/$img"
done

[ViPeR_930]

Thanks for the help. I updated to 6.9 and mogrify now works for batch resizing the gifs.

[ViPeR_930]

For a script such as this, where can I insert "nohup" command so it runs after I close the ssh connection? I put nohup at the mogrify line but it stops after completing the first directory.

Code: Select all

cd
list=`find /backup/gifs/upload/*/big -type d`
echo "list=$list"
for directory in $list; do
echo "directory=$directory"
cd $directory
nohup  mogrify -path ../medium -monitor -resize '280' *.gif
cd
done