v4l2src: preserve features when fixating caps
The caps features were lost when sorting caps structures in gst_v4l2src_fixate(). This was breaking alternate as GST_CAPS_FEATURE_FORMAT_INTERLACED was removed from the caps.
GitLab will be down for maintenance Monday June 03, from approx 10am UTC for roughly 48 hours. This is for a major gitlab upgrade which requires a DB migration. See the tracker issue for more informations.
The caps features were lost when sorting caps structures in gst_v4l2src_fixate(). This was breaking alternate as GST_CAPS_FEATURE_FORMAT_INTERLACED was removed from the caps.