Hi all, i want to record AAC+ (960) stream to a file. So best or probably the only container which support understand this format is mp4. i am able to get the file recorded with the following pipeline: $ (aac+ source through appsrc) ! mp4mux ! filesink location a=a.mp4 The file recorded can be very large and when streaming this file over any DLNA server, my player (device) doesn't able to play it because of memory constraint. Having faststart file have issue of taking very long time after recording is finished. So the user experience is bad in this case. To avoid long delay after recording is stopped and to support almost unlimited length of recording, i have used fragment-duration=500 streamable=1 flag for mp4mux. This does the job correctly except i cant seek into the file. qtdemux offcourse don't support the seeking for fragmented file. Is there any way i could achieve seeking in fragment mp4 file? Does only having fargment-duration without streamable will support seek or both are tied up? thanks for your help! regards, Abhimanyu