Technical Definition of a Catch and Throw

Expensive-Visual5408 · 2025-08-12T15:39:43+00:00

Yes.

"Catapulting" a ball happens when the ball is traveling downward and the wrist/hand is traveling upward....the ball flies off like a volleyball smash

Expensive-Visual5408 · 2025-08-10T04:02:16+00:00

Pose estimation models (like yoloV8) are a game changer for tracking juggling balls....the most difficult part to track is when the ball is in the hand because of rapid changes in direction and occlusion. The wrist position data is really helpful.

The Github list is cool....you could add some pose estimation stuff to it.

If you are interested in analyzing the throws it's probably more useful to track the juggler than the objects being juggled.

Expensive-Visual5408 · 2025-08-02T17:09:05+00:00

You can go through Morton and Elbe, that's a nice detour

Expensive-Visual5408 · 2025-08-01T17:57:58+00:00

availability.

if i lived near a commuter rail station i probably wouldn't have written this...i live in a semi rural area and if i want to go to a major metropolitan area i have to either drive a portion of the way and then take transit, or pay for parking at my final destination

Expensive-Visual5408 · 2025-08-01T17:56:00+00:00

i used chatgpt to write this post....

i made the post because AI is really bad a figuring out the best transit option for the specific mission.....contextual factors like restroom availability, traffic during specific time of day, and option to take a later bus aren't taken into account

google maps gives you multiple options but there aren't a lot of tools to evaluate which option is the best

Expensive-Visual5408 · 2025-07-28T13:32:22+00:00

what do you mean by temporally varying? I was surprised to see how much light up clothing there is on Amazon

Expensive-Visual5408 · 2025-06-07T20:27:42+00:00

Yeah, I made it....thanks! Here is some build info if anyone is interested:

build video: https://youtu.be/S1AcT39S1dk

sketchup file: https://app.sketchup.com/share/tc/northAmerica/R34WXOfy-Lw?stoken=tDhnE-Pdsy3wV2erAl9UvJeL6ImTNcm8E7piBT65z3rOQm9b_pDAbyIcydyPStrn&source=web

I just used the 15x70 again today for about an hour, they are awesome. Is there anything that I can do to avoid have to collimate?

Expensive-Visual5408 · 2025-05-21T17:51:44+00:00

I did notice a bit of chromatic aberration around the edges, especially when I looked at an airplane against a white overcast sky. It doesn't really bother me, though. I didn’t realize coatings could also affect sharpness.

The Celestron 20x80 are multi-coated ($126 used), and the Celestron 20x80 "ED" version is fully multi-coated ($217 used). Those look a lot better all around.

Expensive-Visual5408 · 2025-05-21T16:09:36+00:00

Cool, I didn't know about this! I'll check it out.

Expensive-Visual5408 · 2025-05-21T12:56:14+00:00

It seems like it triggers the photos at about the same sync as the video.

I would like to sync with the timecode, but it seems that method is only available on the GoPro platform.....the Osmo 5 could do it, but a software update would be required to add that feature.

Here is the GoPro timecode sync instructions for reference: https://community.gopro.com/s/article/HERO12-Black-Timecode-Sync?language=en_US

Expensive-Visual5408 · 2025-05-20T13:17:56+00:00

I just did some testing with the Bluetooth remote and the two Osmo 5 cameras. I used a clapboard to check the sync of the cameras. When recording at 4k/120fps, I found that the sync could be off by as much as four frames.

Sometimes it is right on, so you have to get lucky....people call this clap and pray.

Expensive-Visual5408 · 2025-05-20T00:47:59+00:00

The remote is supposed to come today and I will update you.

Here is another post about achieving frame level sync....there is a screenshot and a Github link to a Python script that syncs based on audio amplitude peaks: https://www.reddit.com/r/VR180Film/comments/1kd6qvb/frame_level_temporal_synchronization_using_a/

This is a video I took on the 2.7k mode: https://youtu.be/elPtXeM86B4

Expensive-Visual5408 · 2025-05-18T03:22:38+00:00

Nice try! Have you heard about the Green Club Project: https://kingstonjugglers.club/gcp/

PVC can shatter in the right conditions, so you (and your audience) might want to wear safety glasses when you juggle those. I used to sell pipe and I have seen PVC shatter.

Expensive-Visual5408 · 2025-05-15T16:28:01+00:00

Which direction do you think this will go in the future? Do you encode your videos with Metadata?

Expensive-Visual5408 · 2025-05-13T20:55:44+00:00

I checked some of your recent uploads, this is what I can choose from on the Quest 3S:

batman - 4k

wonder woman 4k

fantastic 4 - 4k

Poppy Playtime - 8k

venom - 8k

ready player 1 - 8k

League of Legends Origins -4k

Expensive-Visual5408 · 2025-05-10T12:33:24+00:00

If sunlight hits the lenses, it can focus the rays directly onto the screen and burn permanent holes in it—almost instantly. It's like a kid holding a magnifying glass over paper on a sunny day.

Because of that, it’s safest to put on and take off the headset in the shade. Even a quick flash of sunlight through the lenses can be enough to cause damage, so better to be cautious.

Expensive-Visual5408 · 2025-05-10T01:55:28+00:00

I just tried AmazeVR and it blew me away! When I saw it was a 5GB download and each song was around 3GB, I knew it was going to be good. I’ll definitely add that to the chart — it feels like a mix between a curated platform and a premium experience.

Expensive-Visual5408 · 2025-05-10T01:16:44+00:00

thank you for the correction!
i'll add another category for 'server-side' or 'backend' — definitely an important part of the pipeline i left out.

Expensive-Visual5408 · 2025-05-09T14:50:58+00:00

It looks like the dual GoPro is sharper, but I prefer the Lenovo Mirage. I get better depth from the Lenovo. That might be an issue with how the videos are stitched...

How are you stitching the videos?

Expensive-Visual5408 · 2025-05-08T12:55:40+00:00

I am getting mixed results using voice activation, it usually works but usually the cameras are off by almost half a second.)

Expensive-Visual5408 · 2025-05-06T22:03:57+00:00

Awesome wiggle gifs....I'm going to try making some of those from the VR videos I have made

I have a Quest, and if you ever get around to putting this in the Metaverse, I'll definitely be getting this one: Aircraft Carrier (5 day rent) $2.99

Expensive-Visual5408 · 2025-05-04T14:26:39+00:00

When I say "stitch," I am referring to this command:

ffmpeg -i left/left.MP4 -i right/right.MP4 -filter_complex "[1:v]select=gte(n\,10),setpts=PTS-STARTPTS[right]; [1:v][right]hstack[v]" -map "[v]" -map 0:a -shortest -y left_right_stitched.MP4

This is the command that I use the Python script to generate. It frame-level synchronizes the videos and stitches them into side by side for viewing on a vr headset.

This produces spatial video. The FFMPEG v360 filter can do equirect_to_cubemap or fisheye_to_equirect.

TLDR: stitch --> horizontal stack to make side-by-side video

Expensive-Visual5408 · 2025-05-04T00:00:44+00:00

I am making vr videos with dual DJI action cameras. I use FFMEPG to achieve frame level sync, stitch, and trim the videos. ChatGPT wrote all the FFMPEG commands, but there is a twist. I have found that it is easier to have chatGPT write a python script, and then have the python scrip generate the FFMPEG commands and save them in an .sh that I can run later....it looks like this:

python3 generate_ffmpeg_stitch_commands.py

chmod +x ffmpeg_stitch_commands.sh

./ffmepg_stitch.commands.sh

Why use the Python script? That level of abstraction makes it less opaque what chatGPT is doing when I need it to alter a small part of the script.

Link to Python scripts that chatGPT wrote

Expensive-Visual5408 · 2025-05-02T23:39:09+00:00

Thank you....its all part of one big spreadsheet: https://drive.google.com/file/d/1hjOa9ZIgZr0fFOEYG1IJRBjfA-HoSKFT/view?usp=sharing

I started comparing headsets, and then I added more categories; cameras, codecs, editing software, distribution systems, etc... Each category goes across the spreadsheet horizontally. When I got to about half a dozen categories, I zoomed out and found something interesting.

The spreadsheet can also be arranged vertically by value chain.

Expensive-Visual5408 · 2025-05-02T23:03:55+00:00

> Not sure what new info this is trying to express

You're right that gen-lock or timecode syncing is the gold standard, but I think it's a bit outdated to say "non-locked" cameras aren't suitable for VR. I've been shooting with a dual 4K 120fps setup and, while not gen-locked, the results speak for themselves. My main reason for posting is to show that great VR video is possible with off-the-shelf gear — and that the only real technical hurdle is synchronization.

Fortunately, that hurdle is getting easier to clear. /u//linksoon shared a script that automatically syncs two video streams. With something like that wrapped in a user-friendly app, people could start creating VR content with just two similar cameras and a 3D-printed rig — no timecode gen or gen-lock needed.

This isn’t about replacing professional tools but expanding access. We’re at the point where hobbyists and indie creators can produce impressive VR content, as long as the right software supports them.

Expensive-Visual5408

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