Trim frames from raw YUV video using FFMPEG

Trim 5 frames starting from 160-th frame and write to png sequence

ffmpeg -pix_fmt yuv420p -s 1920x1088  -r 1 -i input_video.yuv -r 1 -ss 160 -frames 5  output_sequence_%d.png

size of input video is 1920x1088, format YUV420 progressive

UPD:
ffmpeg is renamed to avconv.
Using it for trimming AVI video:

avconv -ss 00:58:00 -t 00:59:30 -i ./video.avi frame_%05d.png