find data at these addresses:

nasa ice (unqcd stuff)

ftp://sidads.colorado.edu/pub/DATASETS/nsidc0081_nrt_nasateam_seaice/north/
descriptions:
https://nsidc.org/data/NSIDC-0081/versions/1

bootstrap

ftp://sidads.colorado.edu/pub/DATASETS/nsidc0079_gsfc_bootstrap_seaice_v3/final-gsfc/north/daily/
descriptions:
https://nsidc.org/data/nsidc-0079/versions/3
update 4/22/19: It appears bootstrap data has moved to here.  Check colorado site as it may get updated
https://n5eil01u.ecs.nsidc.org/PM/NSIDC-0079.003/

for making movie from many files:
easiest method:

ffmpeg -f image2 -pattern_type glob -i '*.png' test.mp4
-This uses the glob function of the bash shell.  It appears that the codec is 
chosen properly with the file extension.  Framerate is quite high though.  Use
the -r option in front of the input to set the framerate of the images. For example:
    ffmpeg -r 1 -f image2 -pattern_type glob -i '*.png' test.mp4
this will set the frame rate at 1 picture frame per second.  So this would usually
mean one day per second which is quite slow.  A frame rate of 8 per second has
good results.  Putting a -r option on the output file will set the framerate to something more normal.
This might be good for some players.  For example:
    ffmpeg -r 8 -f image2 -pattern_type glob -i '*.png' -r 30 test2.mp4
It turns out that players such as quicktime and windows default player don't like videos made
with this method.  Another switch is needed, -pix_fmt.  Use yuv420p as that seems to work.
    ffmpeg -r 8 -f image2 -pattern_type glob -i '*.png' -r 30 -pix_fmt yuv420p test2.mp4



Many more options can be set.  Check ffmpeg manual or many websites
like this one:
http://hamelot.io/visualization/using-ffmpeg-to-convert-a-set-of-images-into-a-video/