splitmuxsink

[westsong]

hi.
    i'm using splitmuxink in my pipeline, with this branch
    ahcsrc ! video/x-raw, format=(string)NV21, width=(int)1280, height=(int)720, framerate=(fraction)10/1  ! queue ! amcvidenc-omxrkvideoencoderavc bitrate=8000000 i-frame-interval=1  !  h264parse ! mpegtsmux ! filesink location=/mnt/sdcard/output-%02d.mp4 
    the pipeline works well, but when i replace the mpegtsmux and filesink with splitmuxsink it doesn't work, the new branch like this
    ahcsrc ! video/x-raw, format=(string)NV21, width=(int)1280, height=(int)720, framerate=(fraction)10/1  ! queue ! amcvidenc-omxrkvideoencoderavc bitrate=8000000 i-frame-interval=1  !  h264parse ! splitmuxsink muxer=mpegtsmux sink=filesink location=/mnt/sdcard/output-%02d.mp4 max-size-time=10000000000 max-size-bytes=1000000
    no mp4 files are generated, why this can't work ?

Thanks