av1enc: Sink caps don't get restricted based on downstream `profile`
For gst-launch-1.0 videotestsrc num-buffers=50 ! video/x-raw, format=Y444 ! av1enc ! video/x-av1, profile=0 ! webmmux ! filesink location=output.webm
the pipeline runs fine and the format for output.webm
is Y444 while profile=0
should be limited to I420
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