Couldn't determine type of stream

[Arjen Veenhuizen]

In this case, you need to encode both video and audio stream and multiplex
them to make it playable. SOmething along the lines of (untested):

gst-launch-1.0 compositor name=mixer sink_1::alpha=0.5 sink_1::xpos=50 
sink_1::ypos=50 !  queue ! x264enc ! h264parse ! mp4mux name=mux ! queue !
filesink location=out1.mp4 filesrc 
location=1.mp4 ! decodebin name=db ! videoscale ! videoconvert ! queue ! 
mixer. filesrc location=2.mp4 ! decodebin ! videoscale ! videoconvert ! 
queue  ! mixer. db. ! audioconvert ! audioresample ! voaacenc ! aacparse !
mux.

Also, why did you use queue2? i changed it to queue since it should work
just fine in this case.



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