MPlayer

I have recently installed MPlayer on my mac. I have had only one problem: the playback of video is VERY "choppy" for a particularly large file. I have the same file in .mp4 and .mov. Both files have the same problem, but play perfectly fine in quicktime. Other, much smaller, files of the same format play just fine.

The video will go a few frames forward and then a couple frames back, etc. The audio is fine, but the video kills they eyes. I don't know how else to explain it. I have done several things to attempt to solve the problem, but nothing seems to work. I have tried --cache --cache-min, --demuxer, and -vo. I don't know what else to try and this doesn't seem to be a problem with other platforms.

Before people go into: "Well, I would just use quicktime...", MPlayer has much better command line integration than quicktime and is a better fit with MY programming needs. I would much prefer it if you don't waste my time with posts about quicktime's "superiority."