Raw rgb frames to mpeg?

Does anybody know of a simple dll that has like 3 main functions, i.e.

1. Start_recording_mpeg(<encoding>, <开发者_如何学Gofps>, <file>, <etc>)
2. Encode_frame(<raw rgb data>)
3. Finish()

Convert your RGB frames to YUV and then pipe them to ffmpeg as described in this blog entry.