Instead extra frames from the source file will be used to lengthen the first edit enough to make it overlap the second edit for the length of the transition. The transition takes effect exactly at the beginning of the second edit and lasts for the specific length of time you set into the second edit.
What this means is that if you set a duration of 2 seconds for a flash transition, it will not start at the last 1 second of the first edit and continue 1 second into the second edit. Instead the transition will start exactly at the beginning of the second edit and last for 2 seconds into that second edit.
This is why it is necessary that the first edit needs to have extra data after the end boundary to provide enough fill for the transition length into the second edit.
Instead extra frames from the source file will be used to lengthen the first edit enough to make it overlap the second edit for the length of the transition. The transition takes effect exactly at the beginning of the second edit and lasts for the specific length of time you set into the second edit.
What this means is that if you set a duration of 2 seconds for a flash transition, it will not start at the last 1 second of the first edit and continue 1 second into the second edit. Instead the transition will start exactly at the beginning of the second edit and last for 2 seconds into that second edit.
This is why it is necessary that the first edit needs to have extra data after the end boundary to provide enough fill for the transition length into the second edit.