Why editing in Video Slave?
With the release of Video Slave 4 we switched from a playlist-based approach to a timeline-based approach. The main reason for this decision was that playlists don't lend themselves well for editing. A growing number of users requested simple editing features as they needed to be able to add short inserts or tie reels of a multi reel film easily for a screening. All of that is easily possible with timelines.
Setting the region start TC
Let's start by dragging a movie file into the timeline. If this is the first movie file in the timeline, Video Slave will set the timeline frame rate to the frame rate of that movie. Once set, all movies dragged to the same timeline must have the same frame rate. Video Slave won't allow dropping videos with other frame rates.
After dropping the video onto the timeline, you can drag it around by clicking it at the bottom half and holding the mouse button down to get it to the right timecode position but it's probably easier to just double click the region and enter the start timecode numerically in the properties panel. If the movie has start timecode information embedded in the file (this is typically only possible in the .mov and .mxf container), you can hold down the Option key while dragging it down to the timeline and Video Slave will try to snap it to the original timecode when you release the mouse button. You can also use the "Place at TC" button after dragging the movie to the timeline to achieve the same result.
Please note that both methods will only work if the start timecode is within range of the timeline you're dragging the movie to. If your movie has an embedded timecode of 00:00:00:00 and your timeline has a start timecode of 01:00:00:00 for example, both Alt-drag and "Place at TC" will not work.
In this example, the first frame of the movie starts is at 01:00:00:00, so that's what is entered for the "In Point". Make sure that "Move" is set for the mode at the top.
To cut a region, just click inside the top half of the region. You will see a blue line appear - the edit cursor. If you now hit "b" on the keyboard, Video Slave will cut the region at the cursor position. To move the edit cursor left or right, use the "," and "." keys. You can use the Option key to move the edit cursor in increments of 1 second and the modifier Control to move the cursor in increments of 5 seconds. Video regions will always be linked with their corresponding embedded audio regions automatically (and vice versa) so you will never accidentally only cut or move one region causing out of sync playback.
When the mouse cursor is close to the region boundaries, it will change to indicate that you can trim the regions easily by dragging the left or right border.
You can also double click the region and use the "Trim" mode in the properties view to trim the start and end of the region either numerically or using the trim buttons.