When the cicp values coming out of GStreamer are unspecified, replace them with the default cicp values for YUV video: 1/13/6. We still may end up with unspecified values inside the params, because GStreamer returns unspecified for primaries/tfs/matrices that aren't supported by cicp. See also https://github.com/AOMediaCodec/libavif/wiki/CICP#unspecified fora similar discussion.