Does the encoder's framerate work when framerate < 5?

Hi everyone,

     When I use the newest RDK (ver 01.05.00.08), I try to set the encoder's framerate dynamically.

I set

    params.targetFps = (1000 * framerate);
    System_linkControl(encId[i], ENC_LINK_CMD_SET_CODEC_FPS, &params, sizeof(params), TRUE);

I calculated the total frame number of 10 sec's bistream.

When the framerate >= 5, I found the bitstream's total frame number was correct.

However, when the framerate < 5, the bitstream's total frame number was wrong. (It was almost equal to

the total number of framerate = 30.)

So, what's the problem?  Did I do something wrong?  Could anyone give some advises?

Thanks,

James