My Skiing Videos

I post skiing videos fairly often, and people keep asking me how I make them, since by most normal understanding of shooting video, they seem like magic.

Skiing fast in Combloux, France on a nice sunny day, filmed by my talented, invisible friend

Is there a drone that follows me? Do I have a friend that can ski backwards very fast while filming, staying out of shot, and not casting a shadow (a vampire?)? Nothing quite so exotic, but it’s still pretty clever.

The Camera

I use an Insta360 One X camera. As you might guess from its name, it shoots 360° video, that is, it captures a complete sphere, looking in all directions at once instead of just a rectangle pointing in one direction. It achieves this by using two cameras and two fisheye lenses, mounted back-to-back, each capturing slightly over a 180° field of view as two square images. These are then mapped into a 2:1 rectangular representation (which conveniently works with common image and video formats like JPEG and MPEG-4) where the poles are the top and bottom edges, which implies a lot of distortion, a bit like a Mercator map projection. This is a full spherical frame image in this format – the distortion is clear (my skis are not the size of surfboards), but the pixels on the left and right sides will match when wrapped around:

A spherical image mapped to a 2:1 rectangle

The combined resolution of these two sensors is 5.7k (i.e. more than 4k), however, you need to bear in mind that all those megapixels have to cover a complete sphere, so you really need it to be this high if you’re going to render out videos that only look in one direction, and thus only use a small portion of the original view.

The “slightly over 180°” field of view is important as it means that when the two video streams are combined, there is a discus-shaped region centred around the camera that is hidden from view, and this is used to make the camera itself (and the selfie stick it’s mounted on) effectively invisible, without having a visible discontinuity (join) between the two image sources.

It’s possible to see the join sometimes, especially when only one lens is exposed to the sun – modern optics are good, but there’s only so much they can do! In this weird perspective, the join is running roughly vertically a bit to the left of me, roughly perpendicular to the lens flare ray from the sun, which stops at the join. The sky is slightly lighter on the left side of the join, probably due to lens flare:

You might have noticed that using spherical images requires a new perspective (ha!) on taking pictures and planning shots; Since you can rotate the view in all directions and zoom in and out, you can produce some very unusual perspectives that are not possible any other way. In the image above, the camera is effectively looking straight up and is zoomed out a long way, so the horizon around it appears as a circle.

One advantage of fisheye lenses is that they have effectively infinite depth of field, so everything is always in focus, and it doesn’t need autofocus. On the other hand, you’re not going to get any subtle bokeh effects!


You can extract still images from the video stream as either rectangular frames, or full 360° images (as I did above). The camera has a higher-resolution stills mode, however, that’s not really possible to use at speed. The stills quality from video streams is remarkably good. I’m particularly pleased with this shot – the spray of snow was caused by the camera hitting the ground at speed, and the camera itself made a gap in the spray, which happened to line up with me!


The camera has “FlowState” stabilisation, which uses accelerometers and gyroscopes to keep track of where the horizon is and keeps it flat and steady, regardless of what angle the camera is held at – when you’re filming in all directions at once, it doesn’t really matter which way the camera is “pointing”, in fact the whole concept of pointing it at something doesn’t really apply. This stabilisation is extremely good, keeping things nice and smooth even during really quite violent movement and vibration, but it’s also partly responsible for the viewpoint feeling disconnected from the subject.


The traditional place to mount an action camera like your average GoPro for skiing is on top of your head, attached to a helmet. That’s fine as it points forwards, but it means you never star in your own movies, and the resulting footage tends to be pretty monotonous. Mounting a 360° camera there is going to be a bit dull too – it means you lose the view of the ground because your helmet will get in the way, but your friends might be nicely captured. To get a nice perspective on yourself, you need to shoot from a bit further away – selfie stick to the rescue!

The camera isn’t that heavy, but when it’s waggling about at the end of a 1.2m carbon fibre telescopic selfie stick in a fast moving situation, it can be hard to control. When skiing you use your hands for holding your poles and partly for balance, and it’s actually painful to hold stick and pole at the same time. To counter this, I designed and 3D-printed a mount that clamps the stick to my ski pole fairly rigidly, and also offsets the angle a bit – otherwise there would be a risk that the “invisible selfie stick” feature would also make my ski pole disappear, but it also gives you a bit of creative control as you can easily move it between front and side viewpoints with a twist of the wrist.

The camera mounted on my bracket – finger space is a bit tight with fat gloves on

This mount is a great improvement, and makes for much steadier shots and safer precarious camera positioning (like 2cm from the ground at 100km/h!). You still lose a bit of motion in that arm (watch how little my left arm moves compared to my right in the video above), and the balance of your poles changes a lot, but it’s quite workable.

My ski pole mounting bracket, top view

Snowboarding is a bit easier because you have your hands free, and the results can look straight out of a video game:

I also printed a bracket to mount it on my mountain bike’s down tube, and this taught me a couple of things: Vibration on bikes is much more violent than on skis, so the selfie stick rattles (the telescopic parts rattle inside each other) and wobbles a lot more; you go a lot closer to things on a bike, and it’s easier to hit the camera.

A new take on jousting

The end result still looks quite cool though.


Insta360 have an iPad & iOS app called… Insta360. The iPad version is great, but the phone one is quite usable too. You have a choice of aspect ratios, trimming and editing, adding soundtracks, colour enhancements, filters, and more. As well as nicely smoothed view angle and zoom factor manual edits, it has some very clever features for auto-tracking a subject. Remember that if you’re rendering out a normal-looking video, as I’ve done here, it’s not just that you can choose your view angles – you have to; clips of the ground whooshing by or the tops of some trees and a bunch of clouds are not that interesting!

The software has some enhancement filters, though they are not very controllable – you can’t for example just “make it brighter”, you have to pick a filter preset that happens to look like what you want, then twiddle an amount slider. The dynamic range is really good – notice that in all these clips you can still see the snow texture in direct sunlight, the highlights are not blown out, yet there is still detail in dark areas.


Insta360 have some other mounts that could be interesting for skiing including a back mount that puts the camera above and slightly behind you for a 3rd-person perspective – just don’t ski under any low branches, and be careful on chairlifts!

They also have a GPS Action Remote gadget, which in addition to controlling the camera remotely, injects a GPS data stream into the video recording. In the editor this data can be used to drive on-screen speedometers and maps. I’ve not tried that, but I’d love to given that I’ve long had a thing about going quite fast. Here’s a clip of me doing that on the Mont Fort World Cup speed skiing track in Verbier, now sadly defunct due to the glacier’s retreat, which also shows how much video quality has improved since 2013 (it was shot on a Contour 1080p camera):

At the start you can see just how steep this is! I managed 147km/h (92mph) on this run.

Posting online

For the most part I share videos via Mastodon, Twitter, and Strava. All of these have similar restrictions/requirements for videos regarding size, video format, bit rate, duration, etc. I usually render full-resolution output from the Insta360 app at 100Mbit/sec, do any simple edits using LosslessCut, and then compress for final output using ffmpeg. The ffmpeg command I use is:

ffmpeg -i in.mp4 -vcodec libx264 -vf 'scale=1280:-1' -filter:a "volume=0.1" -pix_fmt yuv420p -strict -2 -vb 4900k -minrate 1024k -maxrate 4900k -bufsize 4900k out.mp4Code language: JavaScript (javascript)

This compresses to just under 5Mbit/sec using the H.264 codec (sadly, vastly superior H.265 video is not accepted by these sites yet), scales the video down to 1280px wide (720p), sets the pixel format that most of these sites want, and also includes a 90% audio volume reduction, as it’s just really noisy otherwise.

Youtube has support for 360° videos, however, I find that these are actually mainly annoying to watch; rendering out a conventional rectangular clip just works better for me, and I’m the director around here…


There are a few annoyances with this camera:

  • The tiny OLED screen is completely unreadable in bright sunlight.
  • There are only two buttons to navigate through all its menus and options, but I never know which one to press.
  • It’s very picky about the SD cards it will work with, though that’s understandable.

The battery life is reasonable, even in the cold, and while I printed a lens cover, the lenses seem to be surprisingly resistant. It doesn’t mind getting covered in snow. For some unknown reason, the 3 threaded sections of the selfie stick use a left-hand thread, which is annoying as it means that the action of tightening the camera undoes the selfie stick.

The One X is a few years old now, and Insta360 have since released newer One X2 and X3 models which solve the screen and controls problem by adding a small touch screen that’s more readable. It also makes the standard case a bit more robust and waterproof, has a bigger battery, better image sensor, and improved audio. Should Insta360 like to give me one to test, I wouldn’t say no!

Should I build a PHPMailer video training course?

I spend a lot of time working on PHPMailer, and even more answering questions about it on Stack Overflow, yet gain very little from doing so. There is a certain amount of professional pride and reputation involved, but that doesn’t pay the bills. I am lucky enough to have a few GitHub and Patreon sponsors (thank you!), but that doesn’t amount to much. The same questions come up again and again, and repeating the same answers over and over, to people who are convinced that they must be the very first person ever to have had trouble sending email through GoDaddy, gets dull and tiring. I also run (a privacy-first email marketing service), so I am continuously exposed to large-scale email issues that small senders never have to worry about, but that are near-impossible to find advice about.

Email is a funny thing; it’s been around forever and is absolutely taken for granted, but it’s horribly complicated (way more so than, say, HTTP), and many developers, especially new ones, have absolutely no idea how it works – hence the repeated mistakes. Email grows more complex by the year, with the addition of things like SPF, DKIM, DMARC, ARC, MTA-STS and more. Some of it is really quite tricky yet the resources available for it either suck or are decades old. I’ve previously pitched book proposals to popular publishers (including O’Reilly and Packt) on “Modern email”, but have always been rejected on the basis that it’s not of interest or “outdated”, even though email usage is forever growing and changing.

So I’ve been thinking about putting together a training video course on using PHPMailer, diagnosing related problems, and using email in general. Such courses are apparently very popular, though I have to admit to not using them much myself, preferring text. I’ve been heartened by the success of projects such as Christoph Rumpel’s Laravel Core Adventures, along with his valuable advice on how he built that. I’ve been impressed by the lovely Jeff Geerling‘s dedication to his ansible book and audience, and have contemplated going the self-publishing route, but a book is a really big commitment, especially on such an enormous subject as email. Video courses are a bit more flexible, though keeping them up to date has its own issues, as Jeffrey Way has said about his amazing output on Laracasts.

The big issue is my audience. I know that it’s going to be primarily junior and novice developers with little experience needing help putting together their first contact form, so it needs to be pitched quite low, at least to start with. I gather that the primary feeder for video courses is social media, but my social media profile (principally Twitter; being a privacy advocate means I really don’t want to go anywhere near Facebook) is mainly more experienced developers, who are probably not the ones who need this kind of help, though you never know – it may just be my impostor syndrome assuming that all these clever people already know about this stuff!

In summary: there is fertile ground for such content, there’s little competition, I’ve got all the experience, equipment, and position needed to do it, but I need some help and encouragement with putting together a platform and reaching my audience. Finally, since I really need to dogfood this sort of thing, please sign up to my PHPMailer mailing list!