i tested by F1C100S but as i remember they are same only F1C200S has more memory-it decodes h264-1280x720 and also if i remember correctly mpeg2-1920x1080 .maybe because of memory F1C200S also supports h264-1920x1080.
good job -but i think v3s is a little heavy for this job and some thing like STM micros is enough also without OS for industrial usage. also by using openwrt maybe its better use spi flash not sdcard.