[BUG] [Dafang] An error occurs while making snapshot request

[toldenburger]

Describe the bug
Installed the plugin, can see the camera in Home app, however I don't see a picture and receive an error in Homebridge.

[Dafang] An error occurs while making stream request
[2018-12-28 20:11:14] [Dafang] ERROR: FFmpeg exited with code -2
[2018-12-28 20:11:17] [Dafang] Snapshot from My Dafang at 480x270
[2018-12-28 20:11:17] [Dafang] An error occurs while making snapshot request

Expected behavior
I was expecting to see a snapshot and when pressing a live image.

Config
"platform": "Dafang",
"mqtt": {
"hostBroker": true,
"port": 1883,
"host": "192.168.1.35",
"debug": true,
"mongoUrl": "mongodb://localhost:32768/mqtt"
},
"cameras": [
{
"cameraName": "My Dafang",
"cameraRTSPStreamUrl": "rtsp://192.168.1.49:8554/unicast",
"mqttTopic": "home/Dafang/#",
"folder": "/volume1/homes/User/Snapshots Dafang/"

Logs
[Dafang] An error occurs while making stream request
[2018-12-28 20:11:14] [Dafang] ERROR: FFmpeg exited with code -2
[2018-12-28 20:11:17] [Dafang] Snapshot from My Dafang at 480x270
[2018-12-28 20:11:17] [Dafang] An error occurs while making snapshot request

Desktop (please complete the following information):

• OS: Homebridge Docker on Synology
• Node Version v8

[KanG00]

Same issue.
Any luck ?