Author | Lightnews

Roz Biking

@rozbiking.bsky.social

33 followers 39 following 85 posts

Less Talking More Biking Cycling, cross country, mountain biking and downhill around Lyon/France https://blog.rozk.net https://www.youtube.com/@RozBiking

blog.rozk.net

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Roz Biking @rozbiking.bsky.social · Jul 29

My own fisheye removal filter for GoPro 8:7/4k/60fps.
Keep the framing, eat the fish, who needs stabilization anyway
code.rozk.net/roz/avidemux...
#mtb #gopro #code

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Roz Biking @rozbiking.bsky.social · 6h

Don't forget the red wine 🤣

Roz Biking @rozbiking.bsky.social · 5d

What's better than a vaccine ? Two vaccines !

Roz Biking @rozbiking.bsky.social · 6d

her zigzaging is awesome

Gravity Labs @gravitylabs.bsky.social · 6d

Lucy Downs Blasting and Schralping #mtb #mountainbike #mountainbiking
https://youtu.be/VIHdWCauKD8?si=t0FZQmhRNorXj0a3

VITAL RAW - Lucy Downs Blasting and Schralping

Lucy Downs spends as much time in the air as she does sliding around corners for an awesome Vital RAW! #mtb #bike #mountainbike

youtu.be

Roz Biking @rozbiking.bsky.social · 6d

that moment when you check at your glasses while wearing another pair of glasses 😅

Roz Biking @rozbiking.bsky.social · 7d

My Sram eagle transmission, the crankwheel is a XX, the cranks are XO, the cassette is a GX and the dérailleur is XO with AXS

Roz Biking @rozbiking.bsky.social · 21d

Updated with the new version: code.rozk.net/roz/avidemux...

Roz Biking @rozbiking.bsky.social · 21d

So i forgot to say i've finished my new fisheye removal filter, it got 6k views in 4 days, not that bad, now all i need is to recover from that damn F* covid #mtb
youtu.be/QPBNYdneCrY

New fisheye removal filter - Ready!

YouTube video by Roz Biking

youtu.be

Roz Biking @rozbiking.bsky.social · 24d

I left my Seagull "1st of May" running for a week without manual rewinding, it lost only 1 second per day, that's a good score actually

Roz Biking @rozbiking.bsky.social · 25d

on the other hand, slight probability of early chestnuts in the high hills

Roz Biking @rozbiking.bsky.social · 25d

High probability of fog banks this weekend in the Grand-Parc, the giant rising sun should be there too °°3

Roz Biking @rozbiking.bsky.social · Sep 30

gotta test it

Roz Biking @rozbiking.bsky.social · Sep 27

I made myself a 60km track into the Grand-Parc

Roz Biking @rozbiking.bsky.social · Sep 27

bikeeeee !!! it's cleanup daaaaayyy

Roz Biking @rozbiking.bsky.social · Sep 26

New fisheye removal filter - Preview
New method based on physical sensor size:
- Fisheye-aware subsampling in linear YCbCr color space
- 4:3 final aspect ratio with minimal cropping
- 115° horizontal field of view
(best viewed in 4k, puke bags not included)
www.youtube.com/watch?v=9IVe...
#mtb

New fisheye removal filter - Preview

YouTube video by Roz Biking

www.youtube.com

Roz Biking @rozbiking.bsky.social · Sep 19

Got a recalcitrant tire, the Tire Booster fixed it, no Co2, no battery, no power line

Roz Biking @rozbiking.bsky.social · Sep 17

I always suspected the field of view provided by GoPro was misleading, so i spent the weekend re-coding my fisheye removal filter, this time based on the sensor physical dimensions and the focal length. I still have to figure out the exact focal length and the frame widening #mtb

Roz Biking @rozbiking.bsky.social · Sep 16

I'm switching back to the supergrounds, there're much lighter than the supertrails, and it took me 2y to blow one, hitting 2 stones at 40km/h, not even on the side of the tire. 1 hard for the back and 1 soft for the front

Roz Biking @rozbiking.bsky.social · Sep 9

I encoded a noisy and shaky 480x720@30fps video, matching the codecs and bitrate used by bsky, using intel hardware encoding (the duration kinda match the processing time on bsky), and hosted it on my blog to give you a sample of the quality we might expect 🤞
blog.rozk.net/col-de-la-lu...
#mtb

col-de-la-luere – blog.rozk.net

blog.rozk.net

Roz Biking @rozbiking.bsky.social · Sep 9

my second feedback was well received too, i'm crossing fingers, if both of them are implemented we should notice some improvements in video quality, i think 480x720 (1:1.5 ratio) could be the sweet spot for biking shorts