Monitor preview flashing white when network lags or mjpeg stream drops frames

[ansonl]

Repost from Ultimaker/Cura#16333 for the correct plugin @fieldOfView

Cura Version

5.4.0

Operating System

Windows 10

Printer

ESP-EYE webcam https://github.com/ansonl/esp32-mjpeg-multiclient-espcam-drivers/blob/master/esp32-cam-rtos/esp32-cam-rtos.ino

Reproduction steps

1. Use a mjpeg stream and camera that may drop some frames or have a network that is under load or lagging
2. Preview the stream in Cura Monitor tab

Actual results

Cura will load the stream and flash white every few seconds

Expected results

Cura will load the stream and display the last received mjpeg frame instead of flashing white when a frame is dropped

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cura.log