When I used "avconvert" instead...
convert 001.MOV[1] 001.jpg
Invalid settings specifier for video track:1.
Command line parse failed at command:-1
avconvert -p <preset> -s <source> -o <output> [<optional track specifications>]
For a more complete help reference use: avconvert --help (or -h)
convert: unable to open image `/var/tmp/magick-44220dJ_XWIcNsmRp.pam': No such file or directory @ error/blob.c/OpenBlob/2643.
convert: no images defined `001.jpg' @ error/convert.c/ConvertImageCommand/3145.
Switching to <delegate decode="mpeg:decode" command=""ffmpeg" -v -1 -i "%i" -vframes %S -vcodec pam -an -f rawvideo -y "%u.pam" 2> "%Z""/> worked though....
Not sure what the issue with the default avconv is ... but it seems to have a problem.