Hi everyone - I'm having trouble opening a Pupil Invisible recording in Pupil Player.

When I open the recording, Player starts generating the lookup tables but then crashes with the following errors:

The recording has been copied to a local drive (i.e., not opened directly from OneDrive), but the same error occurs.

Is there another way to recover the recording?

Thanks, Alice

Hi @user-135d81 , it looks like this may be an incomplete recording. Would you be open to sharing it with us [email removed] Then, we can provide better feedback.

Hi, I just purchased a used pair of invisible glasses . The seller said they are new, never used. I can not unlock the phone. Does Pupil send out their phones with a log in code?

Hi @user-5f97aa , we do not. The phones are never turned on or used by us. This means the previous owner had put a lock on the phone and it would be advised to contact them for the code.

ok , If i can't get this phone unlocked, what model phone should I buy

You can see the list of supported devices and Android versions here. Please note that you need the specific listed Android version. If you purchase second-hand phones, they can sometimes come with newer, incompatible versions of Android, so perhaps clarify with sellers first, if you go that route. Otherwise, you will need to downgrade the Android version first.

ok thanks for your help

Hi, pls does anyone know where I could buy a used pair of invisible glasses? I've mostly searched facebook and ebay to no avail. There are no official shop sites anymore either.

Hi! I’m currently using Pupil Labs Invisible (and Pupil Labs Neon) in a setup to record video and audio. While the camera specs are described in detail, I was able to find very little on the microphone specs.

It is clear that the Invisible has one microphone. Could you provide: • audio sample rate, bit depth and codec; • microphone manufacturer/model and type; • whether any audio processing is applied to the microphone signal before encoding, such as automatic gain control, noise suppression, high-/low-pass filtering, etc.; • how the audio is timestamped and synchronized with the scene video; • whether there is a known systematic audio/video offset or clock drift?

The main purpose is to accurately describe the recording setup in a manuscript and to assess whether there are any relevant limitations.

Thanks in advance!

Hi @user-af5d74 , I will answer your Pupil Invisible questions here:

• AAC (low complexity) (mp4a), 32-bit, 48 kHz, mono
• The microphone manufacturer, model, and type are not public.
• No audio processing is applied to the microphone signal before encoding.
• All of Pupil Invisible's datastreams are timestamped by the same high-precision clock, in UTC format with nanosecond precision.
• There is no known offset or drift for audio or video with Pupil Invisible.

Hi, I’m using Pupil Invisible + Real-Time API + real-time-screen-gaze to map gaze onto a laptop screen showing PowerPoint.

Surface localization is usually very good (often 95–100%, with 5–6 AprilTags detected), but gaze accuracy varies a lot across the screen.

Example:

Center expected (0.5, 0.5), measured about (0.535, 0.499) → fairly good Top-left expected (0.2, 0.8), measured median (0.155, 1.004) → large error, especially vertically

The error is not constant across the screen, so Companion offset correction does not seem sufficient.

I also occasionally get WRN: Matrix is singular. even when most/all tags are detected.

Has anyone experienced this with Pupil Invisible at laptop viewing distance? Would you recommend a screen-specific multi-point calibration/correction before AOI classification, or is there another preferred approach?

My use case only needs reliable separation between large Text and Visual AOIs, not pixel-level accuracy.

Thanks!

Hello @rob, thank you once more. Finally, could you confirm the AAC-LC bitrate?

You are welcome. The bitrate is 64 kb/s.

For future reference, this information can be extracted from a Pupil Invisible World camera MP4 with the ffprobe command of ffmpeg.

Hello, i am using a pupillabs invisible. I disconnected the glasses from the companion device, when i wanted to connect them again the camera and eye sensors do not light up in the companion app. I have tried the troubleshooting steps in the Invisible docs but those did not fix it.

Hi @user-15b1d8 , can you open a Support Ticket in 🛟 troubleshooting about this? Then, a member of the team will reach out to walk you through debugging steps.

Hi Rob im trying to open a ticket as you said but i get a notification saying: The application didn't respond in time

@user-15b1d8 Thanks. The responsible team has been made aware and we responded to the email you sent to [email removed] We can continue communication there.

Have u ever had this error?

Recording Error Video transcoding failed for this recording. We have been notified of the error and will work on a fix. Please check back later or get in touch with [email removed] Recording ID: 675d33c5-f429-495c-a076-693f4b5e9d63

Hi @user-d2643e , we can continue discussion about this in the Support Ticket you opened. Thanks!