voxl-mavcam-manager in differnt versions

[arvind_g3aero]

Hi team,
We are working on voxl2 board.In mavcam manager we have encountered issue .With 1.3.5 and 1.4.0 sdk multiple cameras switching through mavcam manager is not happening,working for one camera and snapshot is saved in GCS QGC and also in /data/snapshots folder.
With 1.6.2 sdk multiple cameras switching through mavcam manager is happening but while we are trying for snapshot voxl-camera serveris disconnecting and connecting again.We have verified by running voxl-camera-server -d in terminal it is giving no buffer space available .If we disable snapshot in voxl-camera-server then it is not crashing and no buffer space error is also not seen .
Our requirement is we have two camera switching and snapshot is also required.Please suggest which sdk to use

[Zachary Lowell 0]

@arvind_g3aero - how many cameras are you running? Can you paste the logs exactly - it is hard to understand the issue without the logs.

As for snapshot - when you change the stream in qgc, the snapshot is probably not tied to the new rtsp steam, causing a fault on the backend - I can look into this at somepoint in the next fwe days.

As for 1.3.5 and 1.4.0 those SDK's do NOT support multi camera streaming into qgc.

Zach

[arvind_g3aero]

Hi Zach,
Thanks for your quick reply.
We are having total 3 cameras,hires imx214,tracking ov7251and usb camera lepton.
SDK we are using is 1.6.2

voxl2 (M0054):/$ voxl-camera-server -d 2
detected system image 1.8.6
using new imx214 defaults

configuration for 2 cameras:

cam #0
name: tracking
type: ov7251
bayer_type: 0
enabled: 1
camera_id: 0
camera_id_second: -1
fps: 30
en_rotate: 1
en_rotate2: 0

en_preview:          1
en_raw_preview:      1
preview_width:       640
preview_height:      480

en_misp:             0
misp_width:          -1
misp_height:         -1

en_small_video:      0
small_video_width:   -1
small_video_height:  -1

en_large_video:      0
large_video_width:   -1
large_video_height:  -1

en_snapshot:         0
snap_width:          -1
snap_height:         -1
exif_focal_length:   0.000000
exif_focal_len_35mm_format:0
exif_fnumber:        0.000000

ae_mode:             lme_msv
msv_exposure_min_us: 20
msv_exposure_max_us: 33000
gain_min           : 54
gain_max           : 8000
standby_enabled:     0
decimator:           1
independent_exposure:0

cam #1
name: hires
type: imx214
bayer_type: 2
enabled: 1
camera_id: 1
camera_id_second: -1
fps: 15
en_rotate: 0
en_rotate2: 0

en_preview:          0
en_raw_preview:      0
preview_width:       1920
preview_height:      1080

en_misp:             0
misp_width:          -1
misp_height:         -1

en_small_video:      1
small_video_width:   640
small_video_height:  480

en_large_video:      0
large_video_width:   4208
large_video_height:  3120

en_snapshot:         1
snap_width:          4208
snap_height:         3120
exif_focal_length:   0.000000
exif_focal_len_35mm_format:0
exif_fnumber:        0.000000

ae_mode:             isp
msv_exposure_min_us: 20
msv_exposure_max_us: 33000
gain_min           : 54
gain_max           : 8000
standby_enabled:     0
decimator:           1
independent_exposure:0

fsync_en: 0
fsync_gpio: 109

thread is locked to cores: 4 5 6 7
connected to mavlink pipe
Connected to cpu-monitor
Starting Camera: tracking (id #0)
gbm_create_device(156): Info: backend name is: msm_drm
setting ov7251 BLC register for cam id 0
Starting Camera: hires (id #1)
Estimated imu dt = 0.000976s

------ voxl-camera-server: Started 2 of 2 cameras

------ voxl-camera-server: Camera server is now running
Camera: hires taking snapshot (destination: /data/snapshots/hires-2026-08-04_06:55:02.474.jpg)
ERROR: bufferGetBufferInfo wan't able to successfully find the requested buffer

Segmentation fault:
Fault thread: cam1-result(tid: 20257)
Segmentation fault

voxl-mavcam-manager

Parameters as loaded from config file:
input #0:
snapshot_pipe_name: hires_snapshot
video_record_pipe_name: hires_small_encoded
default_uri: rtsp://192.168.168.156:8900/live
enable_auto_ip: 1
mavlink_sys_id: 1
input #1:
snapshot_pipe_name: uvc
video_record_pipe_name: uvc
default_uri: rtsp://192.168.168.156:8901/live
enable_auto_ip: 1
mavlink_sys_id: 1

existing instance of voxl-mavcam-manager found, attempting to stop it
COMPID: 100
Mavlink server Connected
COMPID: 100
Error trying to send control command to pipe ch2 /run/mpa/mavlink_to_gcs/, not connected
Mavlink server Connected
Mavlink server Connected
Mavlink server Connected
auto-detected RTSP URI: rtsp://192.168.168.156:8900/live
Sending stream info to gcs: rtsp://192.168.168.156:8900/live
auto-detected RTSP URI: rtsp://192.168.168.156:8901/live
Sending stream info to gcs: rtsp://192.168.168.156:8901/live
Unable to find valid pipe that accepts control commands at: uvc
Successfully sent command to /run/mpa/hires_snapshot/control
Sending camera_settings with mode VIDEO to gcs
Sending camera_settings with mode VIDEO to gcs
Sending camera_settings with mode IMAGE to gcs
Sending camera_settings with mode IMAGE to gcs
Successfully sent command to /run/mpa/hires_snapshot/control
Unable to find valid pipe that accepts control commands at: uvc
Sending camera_settings with mode VIDEO to gcs
Sending camera_settings with mode VIDEO to gcs
Sending camera_settings with mode IMAGE to gcs
Sending camera_settings with mode IMAGE to gcs
Sending camera_settings with mode VIDEO to gcs
Sending camera_settings with mode VIDEO to gcs
Sending camera_settings with mode IMAGE to gcs
Sending camera_settings with mode IMAGE to gcs
Unable to find valid pipe that accepts control commands at: uvc
Successfully sent command to /run/mpa/hires_snapshot/control

root@arvind-Victus-by-HP-Gaming-Laptop-15-fa0xxx:/home/arvind# adb shell

                                                     ▂▂▂▂▂▂▂▂▂▂▂▂▂            
                                                ▂▄▆▆██▛▀▀▀▀▀▀▀▀▜████▆▆▄▂      

███╗ ███╗ ██████╗ ██████╗ █████╗ ██╗ ▗▆████▀▔ ▔▔▀▀▀▀▚▄
████╗ ████║██╔═══██╗██╔══██╗██╔══██╗██║ ▗▟████▀ ▗██▖ ▐█ ▝▀▆▄▄▄
██╔████╔██║██║ ██║██║ ██║███████║██║ ▟████▀ ▗█▘▝█▖ ▐█ ▜█▀█▄
██║╚██╔╝██║██║ ██║██║ ██║██╔══██║██║ █▌ ▐█▌ ▗█▘ ▝█▖ ▐█ ▐▄ ▄█
██║ ╚═╝ ██║╚██████╔╝██████╔╝██║ ██║███████╗ ▀████ ▗█▘ ▝█▖ ▐█ ▂▄███▀
╚═╝ ╚═╝ ╚═════╝ ╚═════╝ ╚═╝ ╚═╝╚══════╝ ▀▀██▄▄ ▂▆███▀
▀▀██▄▄ ▀▀▆▄▄▄▄▆██▀▀▀▘

────────────────────────────────────────────────────────────────────────────────
system-image: 1.8.06-M0054-14.1a-perf
kernel: #1 SMP PREEMPT Wed Oct 22 03:21:50 UTC 2025 4.19.125
────────────────────────────────────────────────────────────────────────────────
hw platform: M0054
mach.var: 1.0.0
SKU: MCCA-M0054-CC-T0-M0-X0
────────────────────────────────────────────────────────────────────────────────
voxl-suite: 1.6.2
────────────────────────────────────────────────────────────────────────────────
current IP: usb0: 192.168.168.156
────────────────────────────────────────────────────────────────────────────────

voxl2 (M0054):/$

voxl2 (M0054):/$ cat /home/root/voxl-thermal-streamer_bkp1.sh
#!/bin/bash

sleep 3
echo "uvc camera feed on 192.168.168.156:8901 "

voxl-streamer --standalone --port 8901 -i uvc -b 200000

We have 2 camera streams one with voxl-streamer----hires_small_encoded on 8900 port
other with voxl-streamer standalone with one service ---uvc on 8901 port

Through mavcam manager (0.6.0) we are able to switch the camera streams in QGC .But while taking snapshot,snapshot is saving in GCS QGC with resolution of GCS Display and snapshot not saving in /data/snapshots folder

while we are trying with command line also snapshot is not saving meanwhile camera server crashing:

voxl-send-command hires_snapshot snapshot
Successfully sent command to /run/mpa/hires_snapshot/control
voxl2 (M0054):/data/snapshots$ ls -ltr
total 0

voxl-camera-server crashed:
Starting Camera: hires (id #1)
Estimated imu dt = 0.000976s

------ voxl-camera-server: Started 2 of 2 cameras

------ voxl-camera-server: Camera server is now running
Camera: hires taking snapshot (destination: /data/snapshots/hires-2026-08-04_07:09:12.701.jpg)
ERROR: bufferGetBufferInfo wan't able to successfully find the requested buffer

Segmentation fault:
Fault thread: cam1-result(tid: 16326)
Segmentation fault
voxl2 (M0054):/$

While we are trying in old sdk 1.3.5 and 1.4.0 snapshot is saving in /data/snapshots folder but 2 cmaera switching is not happening through mavcam manager

Our requirement is to switch two streams and also screenshot need to be saved in /data/snapshots folder

Please suggest us which SDK to use for both purpose(camera switching and also snapshot) ,and what is that buffer issue in 1.6.2 SDK

Thank you