Writing UVC frames to a file

Kris · 19 Dec 2022, 23:50

Re: Video recording from a 4k camera to a SD card.

Hello, I was wondering if I could get some assistance writing UVC frames to a file. This was mentioned in a previous post but I am not sure how to go about doing it.

Also, I have a script that could possibly save UVC camera video to the onboard SD card but I am not sure how to implement this script into VOXL.

tom · 20 Dec 2022, 18:37

@Kris If you're just wanting to save frames I would take a look at https://docs.modalai.com/voxl-logger/

Kris · 10 Jan 2023, 08:05

@tom
At the moment, it’s only possible to write frames from a UVC camera with either RAW8, RAW16, NV12/21, or FLOAT32 formats. Does H.264 format fall into that criteria?
I am currently looking into purchasing a different UVC camera that has these output formats; H.264, MJPG, and YUY2.
Has H.264 standard compressed format been tested for writing files to the VOXL’s onboard SD card?

10 Jan 2023, 17:31

Hi,

We're currently working on getting h264 encoding working in voxl-camera-server for our mipi hires cams, so this will be our default encoded format for those cameras as well. I believe uvc server would take a few small tweaks to accept that data and spit it out of a libmodal-pipe, but the support is already there on the other end, we know how to handle encoded frames on these pipes and we have a voxl-record-video on our dev branch that will take encoded frames over a pipe and write them to a file.

Kris · 16 Jan 2023, 00:01

Hello @Alex-Gardner,
I have tried looking for this voxl-record-video in the dev branch, but could not find it. Was it removed recently?
I was looking in this location.
If this is the wrong location, could you please let me know where to find the voxl-record-video ipk.

16 Jan 2023, 17:34

@Kris,

voxl-record-video is a utility that is included in voxl-mpa-tools, see here (https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-mpa-tools/-/blob/dev/tools/voxl-record-video.c)

Kris · 2 May 2023, 01:53

@Alex-Gardner
I am trying to get the C270 uvc camera to record its video or frames to the Seeker's onboard SD card.
I have not had any luck using Gstreamer for this.
Has this been successfully done with the voxl-record-video command from the dev branch?
If so, how would I go about getting this to work?