Dear all, Is h264_mp4toannexb_filter used to deal with .mp4 container? Is it necessary when playing h264 codec .mp4 file? how to call the function h264_mp4toannexb_filter in h264_mp4toannexb_bsf.c I am trying to use libavcodec.lib to write an application which can play h264 coded .mp4 file on WINCE OS. Thanks! Regards, zln