Set the capabilities on the appsrc element. This function takes
a copy of the caps structure. After calling this method, the source will
only produce caps that match @caps. @caps must be fixed and the caps on the
buffers must match the caps or left NULL.
Set the capabilities on the appsrc element. This function takes a copy of the caps structure. After calling this method, the source will only produce caps that match @caps. @caps must be fixed and the caps on the buffers must match the caps or left NULL.