what is problem with mp4mux

[metind]

Dear all,

I am trying to get audio and video items from audiotestsrc and videotestsrc
then mux as mp4 to download as mp4 file. I used ;
gst-launch videotestsrc ! ffmpegcolorspace ! videoscale !
video/x-raw-yuv,width=320,height=240 ! ffenc_mpeg4 ! queue2 ! mux.video_0
audiotestsrc ! audioconvert ! lamemp3enc ! queue2 ! mux.audio_0 mp4mux
name=mux ! filesink location=myfile.mp4

but when i try to open the myfile.mp4, player gives error. 



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