Dear Sir,
  Currently, our company need to encode file into 3GPP format (mpeg4 video, 3gp audio)
And I download the mpeg4 encoder pack from your site.
And there are something I am confused.
When I try to make one 3gpp file with your DShow filters in graphedit.
I found that the film made has strange sounds, I don't know whether if this is reasonable in evaluation version.

The follow sequence is my graph in graphedit.

     
File-->raw video-->mpeg4 enc    -->mp4 multiplexer--> file writer  
------>raw audio-->AMR encoder ------------------------>

Please give me some help how to use your filters in correct way.