Which command replaces the project clip using the duration of the browser clip?

The command that replaces the project clip using the duration of the browser clip is the command to simply "Replace." When you use this command, Final Cut Pro takes the selected clip from the browser and swaps it with the existing clip in the timeline, matching the exact duration of the new clip. This means that if the new clip is shorter or longer, Final Cut Pro adjusts the timeline to fit the new clip's length.

The other commands, while related to replacing clips, focus on specific behaviors regarding the starting point or end point of the clip. "Replace All" would replace all occurrences of the clip, rather than focusing on a singular timeline instance. "Replace from Start" would replace the clip starting from the beginning, potentially ignoring the original duration, while "Replace from End" would take the new clip from its end point, which might also not match the original clip's duration.

Understanding the distinction is crucial, as proper clip replacement can significantly affect your project's timing and flow.