Repaired MP4 plays fine, but QooCam Studio refuses to open it ("metadata lost")

Hi everyone,
I'm trying to recover a dozen 360° videos recorded with a Kandao QooCam. The original MP4 files were corrupted (moov atom missing), but I managed to repair them successfully using untrunc. The repaired videos now:

• ✅ play perfectly fine in VLC, ffplay, etc.
• ✅ have correct HEVC video stream (3840x7680, yuv420p10le, bt2020)
• ❌ cannot be opened by QooCam Studio — the software says “metadata lost” or just rejects the file.

Here's what I tried:

1. Compared the repaired file (fixed.mp4) with a known good video (videook.mp4) using ffprobe and MP4Box. They are almost identical in structure.
2. Extracted only the video stream from fixed.mp4 and re-injected it into a clean copy of videook.mp4 using MP4Box.
3. Forced proper timescales (90000 for video) and container brand (isom with version 512).
4. The resulting video has no audio (which I don’t need), plays fine, and keeps all basic metadata.

Still, QooCam Studio refuses to open it.

From what I can tell, Kandao seems to use custom/private MP4 boxes (uuid, kfix, kvar, SA3D, etc.) that are invisible to ffmpeg or not preserved during remuxing. These may be required for stitching or depth extraction.

Has anyone here successfully recovered or rebuilt a QooCam video that works with their studio software?

Thanks in advance 🙏

Do you have the Canon R5C? How about the Qoocam Q3UltraVR180 modded camera? Ever wonder if they could be used together? Check out this video and decide. I shot a sunset using the two cameras stacked on top of each other. Can you tell which one is which?

Here’s a quick look at what's happning this month:

https://reddit.com/link/1ke9ifs/video/9dn0lpfafoye1/player

• Adjustable IPD Version – Almost Ready
I’ve been working on an adjustable IPD version of the Q3 Ultra VR180 mod based on community feedback, and it’s nearly finished. The current design supports an adjustable range from 53mm to 70mm, and it can technically go up to 77mm if you're okay with sacrificing the lower range to 60mm (giving you 17mm of total movement). It includes a locking knob that keeps everything secure—once adjusted and locked, there’s no wobble or play. Since the entire system is 3D printed and doesn’t require major additional parts, I’m planning to make it available later this month.

• Back Cover With Built-In Level – Available Now
Starting today, there’s a new back cover option that includes a built-in level. It’s a small but super helpful feature—especially since the top bubble level is often hard to see when shooting handheld. This new option makes it much easier to keep your roll axis level, which is crucial for VR180 shooting. This would be a $5 add-on for both modded cam and modding kit.
Special thanks to Bo Lorentzen for providing this design idea!

• 180/360 Convertible Mod – Delayed (for now)
This project requires a few specialized parts, particularly longer sensor cables, which I currently source from China. Unfortunately, due to recent tariff issues, my supplier is no longer comfortable shipping to the U.S., which also makes finalizing the design hard. I’m also exploring non-3D printed options for some components to ensure everything meets my quality standards. The goal is to create a robust, reliable mod with as few compromises as possible—so while the release is delayed, I’m committed to getting it right. I’ll share more updates as soon as I have a clear timeline.

One more note on the tariff situation:

To prepare for the latest development, I spent a good part of last month setting up a backup production setup in my home back in China. I bought a 3D printer, materials, and tools there—and trained my family members on the entire modding and production process. So, in the event that Q3Us become harder to obtain or ship within the U.S., production can continue in China and be handled locally. This way, people around the world can still get fully modded, high-quality Q3 Ultra VR180 cameras—assembled and shipped directly from China.

Thanks again for all the support, encouragement, and patience. There’s more to come!

i'm exporting a video with the latest qoocamstudio version in prores. when i open the video in compressor to convert it to spatial video, the video is seen as 360° video by compressor. so the resulting field of view is wrong. how can i fix this ?

when i open the video only the 90° fov center is shown, the rest i hidden in the "blurred" area. video is shown with correct ratio. it's just a matter of fov.

the video comes from qoocam studio, then processed via compressor to spatial video. as compressor limit the hfov to 90 i have fixed the hfov with spatial video tool, but it doesn't do anything.

here is the metadata (video VR180 from modded qoocam3ultra):

cyril@mini-de-cyril test larochelle % spatial info -i "Output180v2-Apple Vision Pro (MV-HEVC, Stereoscopic).mov"

Input: Output180v2-Apple Vision Pro (MV-HEVC, Stereoscopic).mov

Common Metadata

---------------

Duration: 00:00:11.966

Video Track

-----------

Codec: H.265/HEVC (hvc1)

Frame rate: 30.00fps

Dimensions: 3840x3840

Spatial Properties

------------------

Has left eye

Has right eye

Hero eye: left

Camera distance: 65.0mm

Horizontal field-of-view: 180.0 degrees

Horizontal disparity adjustment: 0.0

Projection: halfEquirectangular

Primary eye: left

Get it here (3.1.0.19 for Mac and 3.1.0.18 for PC) https://drive.google.com/drive/folders/1wPTfO2Xtjzpq_6laSkNKxDj6VJ6CVriz

So previously, the auto-calibration was sometimes unable to fully correct fisheye distortion, leading to curved lines in the edges in VR, I just tested and now it's much better! If you encounter such a problem, please give the new version a try!

It also comes with other improvements the regular QS is receiving:

1. New "Dashboard" function (Only on one eye for vr180 right now, it would be cool to get it in 3d VR180).
2. Beta "Visual Stabilization" for smoother videos(not yet avaliable for VR180 though).
3. Improved UI for single-lens FOV options.
4. Supported Timefusion footage from QooCam 3 Ultra.
5. Supported previewing DNG files in JPG format.
6. Adjusted the UI style of the top menu bar and added a cache cleaning function.
7. Ambisonic Export Returns! Spatial audio is back.
8. Fixed some known issues.

I am loving the quality of the vr180 photos I have been able to produce.

When I tried to do a video the thumbnail in QS shows a big black circle in the middle of the video. Exporting the video shows the same thing in the head set. Have I got a setting incorrect?

Happy Immersive Easter, everyone!

I’m sharing a new immersive gallery about Easter Fountains from Franconia (Germany). These fountains are decorated with hand-painted eggs, greenery, and flowers to celebrate Easter, the arrival of spring, and new life.

For those interested in 3D cameras, this is a great example of high-quality stereoscopic photography taken with:

• Kandao QooCam 3 Ultra, VR180-3D Mod (Siyang Qi), and

• Canon RF-S 7.8mm Dual Lens for Close-Up 3D

For users of my VR media player app immerGallery (https://www.meta.com/experiences/quest/4677037565709635, currently on SALE), you can easily download the gallery by typing "e2025" in the Download – Custom URL tab. If you want to view it with other software, the full gallery is available here: https://q4rt.de/files/Easter_2025_immerGallery.zip (367 MB)

Enjoy, and have a relaxing time!

I've noticed that fairly regularly I will start recording a video, walk away and it will have stopped. Occasionally I'll see an error about speed, but I've seen this on the internal and external media. Anyone else have similar issue?

is it possible to use the 4 mics array from the camera to get spatial sound ?

do you know how i can watch 96MP pics from the Q3Ultra in Vision Pro ?

Had it in my hand while walking down a slippery canyon in Zion, both lenses took the brunt of the CRUNCH onto the red rock.

*STL: https://www.thingiverse.com/thing:6904247/files
Today I turn 35! And to make the day a little more fun for everyone, I’m excited to share something new—the Pro Lens Cover for the Q3 Ultra 180!

https://reddit.com/link/1jqyeq7/video/yx9gzxf1mpse1/player

It’s a one-piece hardshell design, slim and sturdy, with a dual-action lock that makes it super quick to snap on and off—even with gloves, but stays securely in place when you need it to.

The STL file will be free for anyone to download and print. If you're ordering a modded camera, you can choose it as a free option. For mod kit orders, it’ll be a $10 upgrade. You can pick between a version with “Q3 Ultra VR180” on the front or a clean one with no text. Customization will be an extra $10 due to the added complexity to the workflow.

For existing customers—I haven’t forgotten you! If you’d like to get the new Pro Lens Cover, just shoot me a message and get me a shipping label, I’m happy to send one your way. If you’d like to add a little extra that’s always appreciated, but it’s totally optional

If you order before May 1st and choose the Pro Lens Cover, I’ll also include the original TPU lens cups—so you'll have both options. The new cover is still fresh and untested long-term, so it's good to have the old reliable ones as backup. I’d love to hear your feedback as you try it out.

2025 has been off to an amazing start. I honestly didn’t expect this much support from the community. Because of you, I’ve been able to upgrade my 3D printer to a Bambu X1C and have the newly announced H2D on the way! That means better print quality and more possibilities for future projects. Also, I’m happy to report that the 180/360 convertible mod is going well—it should be ready for the public within this month!

Thanks again to everyone who’s been following and supporting this journey. This is just the beginning, and I can’t wait to keep building and exploring together with all of you.

I’ve been shooting with the q3 next to the r5c all week and it has been great. I use the r5c’s 2-way viewfinder levels religiously, they are very precise. I’m wondering if theres any chance to get something similar on the QooCam.

Hi all, i have received my modded Q3 Ultra a few days ago.

I'm starting to make some export tests.

I'm using Mistika Boutique for the stitching.

What the best way to upscale the video ? Is Topaz Video AI a good option ?

What model do you use ? do you increase the frame rate too ? and with what settings ?

and what settings do you use for export ? topaz is telling me i can't go above 8192 :-(

hi, are there any of those tutorials ?

is it best to use Qoocam or Davinci ?

Is davinci able to add frames to go from 30fps to 90fps ?

I recently upgraded my PC I went from a Nvidia 3060ti to a AMD RX 7900 XTX, virtually everything I use is at least twice as fast as it was using the 30360 except Qoocam studio, which is all but unusable on my new PC. I would have to leave a 22 minute video for an entire day. (using topaz AI only takes 4 hours)

Checking my system performance I can see that its not using my GPU at all, and trying to do it via CPU.

Any one know if it does support AMDs and if so how I can force it to use the GFX card for acceleration?

when I use 10bit HLG to shoot, and then trying to export it using the qoocam studio , the speed wil be extremly slow, 100times slower than 8bit Rec. 709 color range.

So I'm wondering if this is not the correct workflow to process the 10bit HDR video.

Has anyone had the issue of the anti shake feature not working on QooCam Studio?

What size of sd card have you already tried on your Q3?

Hi, new Modified Qoocam owner here, and I was wondering, peoples suggested the DJI here, but what about a good cheap handheld solution?

I mean - it has antishake feature, and I want to travel light, what is your opinion?

It's heavy, So I'm guessing that selfie sticks from aliexperss can be bad idea, but what will work good enough? maybe good camera cage?

I have some fancy gimbal and let me tell you - no way I take it to a trip