How to get from video/x-gst-fourcc-H261 to video/x-h261

[fkoh]

I have a *.mov file encoded in H261

I want to use avdec_h261 which has sink caps "video/x-h261".

What comes out of 
"filesrc location=somefile.mov ! qtdemux "
is "video/x-gst-fourcc-H261"

How do I bridge the gap between 
"video/x-gst-fourcc-H261" (the source caps of filesrc) 
and 
"video/x-h261" (the sink caps of avdec_h261)?

Many thanks for any help.



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