The previous wording suggested that `setVideoEffects()` may **only** be
called before `prepare()`, i.e. the effect cannot be changed during
playback. The intent is instead that `setVideoEffects()` must be called
once before playback in order to configure the effects pipeline, but
the effect can then be changed during playback by further calls to
`setVideoEffects()`.
Issue: androidx/media#1393
PiperOrigin-RevId: 641853629
253fcb1fd1