# Issues Streaming and Taking Snapshots Simultaneously with OV64B on VOXL2 (Hadron 640 Setup)

Source: https://forum.modalai.com/topic/4451/issues-streaming-and-taking-snapshots-simultaneously-with-ov64b-on-voxl2-hadron-640-setup
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2025-05-22 20:28:27 UTC by restore
Replies: 2 · Views: 590

## restore · 2025-05-22 20:28:27 UTC

Hi,
I'm working with a VOXL2 and the FLIR Hadron 640 camera, and I'm trying to stream video from the OV64B sensor while taking snapshots at the same time.

Initially, I attempted to use "en_preview": true along with "en_snapshot": true, but that configuration did not allow me to stream video. I assumed it might be a resolution constraint, so I modified the configuration to use "en_small_video": true and "en_snapshot": true instead.

Now I can stream video, and when I enter the following command:
voxl2:/data/snapshots$ voxl-send-command hires_snapshot
Successfully sent command to /run/mpa/hires_snapshot/control
In the voxl-camera-server terminal, I receive this error:
ERROR:   Camera: hires got unknown Command:
However, when I enter:
voxl2:/data/snapshots$ voxl-send-command hires_snapshot snapshot-no-save
Successfully sent command to /run/mpa/hires_snapshot/control
The camera server shows:
------ voxl-camera-server: Camera server is now running
Camera: hires taking snapshot for pipe only (not saving it)
But I’m unable to access the snapshot data, even after running adb pull.
My Questions:
Is it possible to stream and take snapshots simultaneously on the OV64B?

What does the error message “Camera: hires got unknown Command” mean?

How can I access the output of snapshot-no-save if it's not being saved to disk?

Thanks in advance for your help!
 Below is my camera config code:
{
  "version":  0.1,
  "fsync_en": false,
  "fsync_gpio":   109,
  "cameras":  [
      {
          "type": "boson",
          "name": "boson",
          "enabled":  true,
          "camera_id":    0,
          "fps":  30,
          "en_preview":   true,
          "en_misp":  false,
          "preview_width":    640,
          "preview_height":   512,
          "en_raw_preview":   true,
          "en_small_video":   false,
          "en_large_video":   false,
          "ae_mode":  "off"
      },
      {
          "type":             "ov64b",
          "name":             "hires",
          "enabled":          true,
          "camera_id":        1,
          "fps":              15,
          "en_preview":       false,
          "en_misp":          false,
          "preview_width":    1920,
          "preview_height":   1080,
          "en_raw_preview":   false,
          "en_small_video":   true,
          "small_video_width":    1024,
          "small_video_height":   768,
          "small_venc_mode":  "h265",
          "en_large_video":   false,
          "small_venc_br_ctrl":   "cqp",
          "small_venc_Qfixed":    30,
          "small_venc_Qmin":  15,
          "small_venc_Qmax":  40,
          "small_venc_nPframes":  9,
          "small_venc_mbps":  2,
          "en_snapshot":  true,
          "en_snapshot_width":    1920,
          "en_snapshot_height":   1080,
          "ae_mode":  "isp",
          "gain_min": 54,
          "gain_max": 32000
      }
      ]
}

## Reply by Alex Kushleyev (ModalAI staff) · 2025-05-23 14:54:05 UTC

@restore 

When you use `voxl-send-command`, the format of the arguments is as follows:

`voxl-send-command <image-pipe-name> <command>`, so when you run `voxl-send-command hires_snapshot`, you are sending an empty command to the pipe `hires_snapshot`. The correct usage would be:

`voxl-send-command hires_snapshot snapshot`

Please try it.

Alex

## Reply by restore · 2025-05-27 19:38:34 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev thank you! It works now.