Appends a timed metadata group to the receiver.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
The timed metadata group to be appended.
true if the append was successful; otherwise,
false. If the append fails the
error property will contain more information about the failure.
The timing of the metadata items in the output asset will correspond to the
time of the
AVTimed, regardless of the values of the
duration properties of the individual metadata items.
Before calling this method, you must ensure that the input that underlies the receiver is attached to an
AVAsset instance by a prior call to
add(_:) and that
start has been invoked on the asset writer.