audio/video out of sync

[Robert Armstrong]

The audio is about half a second behind with this pipeline. I've tried
removing and adding queues in various places but nothing seems to resolve
it.

gst-launch-1.0 -e v4l2src device=/dev/video1 do-timestamp=true ! queue !
video/x-h264,width=1280,height=720,framerate=30/1 ! h264parse ! queue !
mux.video_0 alsasrc device="plughw:2,0" ! audioconvert ! lamemp3enc ! queue
! mux. mp4mux name=mux ! filesink sync=true location=camera.mp4

What else can I do to fix it?
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