Modification to swf player

We have a custom built flash player - it has been design to play our propriety encrypted swf, files as well as encrypted, streaming flv and mp4 files. In other words it doesn not play regular swf files, only our own encrypted file formats. We have an encoder that encrypts our swf files. We need some modification done to the player. 1. Currently the player does not play variable bitrate mp4 files - we need this changed so it will play variable bit rate mp4 files. You will be required to sign an Non disclosure agreement before we can send any sample code as this player is our propriety software. We have the player source code.