MP3 + JPEG --> MP4 - what's wrong with this pipeline?

[Michael Niemand]

gst-launch --gst-debug-level=2
filesrc location=audio.mp3 ! mp4mux name=mux
filesrc location=image.jpg ! jpegdec ! caps="image/jpg,framerate=30" !
x264enc ! caps="video/x-raw-yuv,width=640,height=480,framerate=30" ! mux. !
filesink location=output.mp4

the files audio.mp3 and image.jpg both reside in the folder where I try to
execute this. The error message is "link without source element"
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