Dolby codec not muxing properly!

[Learner00100]

Muxing AC4 is not working properly. The output from mp4mux for full length movie, only half duration of runtime is playing properly and for remaining half duration video is stuck and audio is loop from that particular half duration to few seconds. Also for ec3 ,video is playing is for full duration but audio is muted for last 25% of full length movie. But using same sample and muxing using Dolbymp4base muxer it working fine. So kindly rectify the issue of Dolby codec in bento4 and update mp4mux. Thank you.