Actually, It makes sense to buy PANASONIC EM5 SERIES TV sets
Just tested my L32EM5E. For USB Playback your USB drive has to have FAT32 file format. It looks like NTSC is not supported. All you can do with NTSC is just to read file directory.
So far, my L32EM5E reads .MP4, .MKV, .WMV video formats. I was not able to read .AVI format yet. So, I convert it to .MP4
Good luck with your L32EM5D,