you have the choice between different import strategies
- Replace current project
- Replace current project and concatenate tracks
- Add to new tracks
- Concatenate to existing tracks
- Paste at insertion point
- Create new assets only
- Nest sequence

As the project is already created we will choose Create new assets only . At this stage remember to save your project.

TIP for gopro files in HD, I encountered huge problems of slowness when editing in the composition window (Compositor), to solve them I had to reprocess the files with this script

#!/bin/bash

for file in G*.MP4
do
base="${file%.*}"

ffmpeg -i $file -b 20M -s 1920x1080 -acodec libvo_aacenc $base.recode.mp4 &
done

We then import in the new format and we find the fluidity necessary to be able to edit.

Assembly

In case you have closed all windows other than the main window, open the Resources, Composition and Viewer windows.

Window -> Show Viewer
Window -> Show Resource Window
Windows -> Show Composition Window








We choose the one that interests us (I took Crossfade ) and by drag and drop we move it in the main window between two scenes. The transition icon has appeared, when we right-click on it, the menu below appears:




Now it's time to add a title to the video. In the Video Effects folder of the Resources window, choose Title, drag and drop it to the beginning of the sequence in the main window.


A red band has appeared over the entire duration of the video, this means that the title will appear all the time, this is not really what we want, just select the red area (at the end of the strip) and reduce it with the mouse.
Now by clicking on the button that looks like a racket on the red banner of the Title effect  you access its properties, the property window is also accessible via the right mouse button by targeting the red Title banner, you bring up a menu, then click on Show options .


Now we will create a fade to black at the end of the video. Towards the last seconds of the video, click on the white line that runs through the entire video, a small white square appears, further on click again on the white line and move the square lower and so on. The series of small white squares materialize the points of passage (key frames) of the fade.


We will now add a soundtrack, we load an MP3 file and in the insertion strategy we choose Add to new Tracks , two audio tracks will be added. We mute the original audio tracks by clicking on the button of the two audio tracks, we also click on the Group settings button so that the settings we are going to make on the added audio tracks are not applied to the two original audio tracks (the button must be in the configuration of the previous screenshot). If the added audio tracks are too long compared to the video track, select the excess ( Cut-paste editing mode ) and cut it ( Edit->Cut ). Now to make the sound fade out at the end little by little, we will use the key frames, on the added audio track at the top we click 2 seconds before the end of the video (you can adjust this value) on the white line that follows the audio track, this creates a small white square (key frame), we do the same at the end of the track and we move the white square to the bottom, as we left the Group settings button checked , this also applies to the second added audio track as we can see below.

Let's move on to exporting, we open the rendering window by clicking in the menu of the main window at Files->Rendering . This opens the window below, we choose to export the video in Quicktime format for Linux with an insertion strategy without insertion into the project. Be careful in the main window you must be placed at the beginning of the timeline otherwise you risk having only part of the project exported or nothing at all.

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