ffmpeg split avi into frames with known frame rate

I posted this as comments under this related thread. However, they seem to have gone unnoticed =( I've used ``` ffmpeg -i myfile.avi -f image2 image-%05d.bmp ``` to split `myfile.avi` into frames stored as `.bmp` files. It seemed to work except not quite. When recording my video, I recorded at a rate of `1000fps` and the video turned out to be `2min29sec` long. If my math is correct, that should amount to a total of 149,000 frames for the entire video. However, when I ran ``` ffmpeg -i myfile.avi -f image2 image-%05d.bmp ``` I only obtained 4472 files. How can I get the original 149k frames? I also tried to convert the frame rate of my original AVI to 1000fps by doing ``` ffmpeg -i myfile.avi -r 1000 otherfile.avi ``` but this didn't seem to fix my concern.