I have both Mac and Windows. Will use whatever works
You can dload glyphs (jpg, png, gif, or bmp) format images of ukulele chords from the internet (I'd prefer to search for images in either SVG or EPS format which are VECTORS and not BITMAPS and can be re-sized without losing detail) if you dont want to make your own,
If you want to make your own, you will need to understand how to use programs like Adobe Illustrator, Corel Draw, Visio, ConcepDraw, AutoCad, InkScape or Dia to CREATE the images from scratch, then you can EXPORT them to a format that can be used by your video software.
FYI - you do NOT need to learn ALL of these, just PICK ONE and then master it, and keep using it. All of them can EXPORT your creations to commonly used formats.
Once you have images of the chord diagrams that you want to use, then you can re-size them, and then you have to OVERLAY them on top of the video (like on the side or in the corner),
or do an insert-cut where the still image runs for 15 seconds or so while your voice-over continues in the background.
This is VERY easy to do with Movie Maker on Windows, iMovie on Mac, OpenShot or Kdenlive on Linux, but you have to understand the basic procedure.
If you want to spend money for Adobe Premiere or Apple's Final Cut that's your option, but be prepared to spend some money and considerable time to learn the basics for either one.
There are TONS of tutorial videos for ALL of the above software on YouTube.
Just search for it (
on YOUTUBE and NOT on BING, Google or DuckDuckGo), i.e.,
"how to overlay graphics in my video"
or something to that effect, and be prepared to invest the time to watch like half a dozen videos until something clicks in your mind and you have that 'a-ha moment'.
To step thru the instructions in text, not knowing your general computer skill level, nor your familiarity with video editing software concepts as well, could possibly take a few 1,000-word posts to the forum, and is not something to be taken lightly.
If you really want to learn how to do it, go to YouTube and invest the time.
This is what I do for anything that does not have a quick-fix. Video editing and/or video production is NEVER a 'quick fix' so you might need to adjust your expectations.
For example, In broadcast-tv video production, for every SECOND of video that is on the air, there is at least 2-4 HOURs of production work, involving planning, storyboarding, camera work, travel, media organizing, editing, post-processing, and then distribution.
2-4 HOURs per SECOND being the MINIMUM, and is often MUCH MORE.
Remember your favorite 1 minute Superbowl ad?
That was likely a minimum of 120 hours work, for a WHOLE CREW of people...
On the OTHER hand...
Ok, so how does Aldrine produce those ukulele tutorial videos for UU+????
I'd guess a minimum crew of 3-4 people (including Aldrine), and one 5-min video likely takes at least 1 week or 40-man-hours, from
'idea' to
'upload to UU+'....maybe less now if they already have all the chord diagrams, and screen masking templates done, and the video editing person has a
really fast computer to render it all together quickly instead of in half a day.
YMMV but due diligence is your best asset.