export yuv-image sequences?

hi,
i'm looking for a way to save an incoming camera signal as an image sequence to a hardrive.
this sounds simple and works fine when using pngs/bitmaps/whatever but i would like to use a yuv-encoded format since this is what the camera is outputting and as well it's only two thirds (4:2:2) or half (4:2:0) the file size. the only way i found up to now is by using jitter binary format - which works well but is not an option since i have to access these images in touchdesigner...
afaik tiff supports yuv-colourspace but whenever i export one out of max the data gets automatically converted to rgba. also, i would actually prefer a less complex and more lightweight format (uncompressed or runlength encoding is perfectly fine).
any ideas anyone?
k