Bug: Timestamp overlay flickers

[bitmux]

Expected behavior: Timestamp displays each frame without flickering/scan issues.
Current behavior: Timestamp shows on some frames, partially on others, and is missing on some frames. Seems to occur at different frame-rates (though presents slightly differently) and is unaffected by resolution.

Device: Wyze V2 camera running openmiko flashed from SD card with overlayed configuration files
Environment: indoors, all lighting conditions

My videocapture_settings.json:
`{
"comment": "1 encoder (1920x1080 H264)",
"general_settings": {
"flip_vertical": 0,
"flip_horizontal": 0,
"show_timestamp": 1,
"enable_audio": 0
},
"frame_sources": [{
"id": 0,
"pic_width": 1280,
"pic_height": 720,
"group": 0,
"pixel_format": "PIX_FMT_NV12",
"buffer_size": 4,
"channel_type": "FS_PHY_CHANNEL",
"crop_enable": 0,
"crop_top": 0,
"crop_left": 0,
"crop_width": 0,
"crop_height": 0,
"scaling_enable": 1,
"scaling_width": 1280,
"scaling_height": 720,
"frame_rate_numerator": 25,
"frame_rate_denominator": 1
}],
"encoders": [{
"channel": 0,
"group": 0,
"v4l2_device_path": "/dev/video3",
"payload_type": "PT_H264",
"buffer_size": 0,
"profile": 0,
"mode": "ENC_RC_MODE_H264VBR",
"frame_rate_numerator": 25,
"frame_rate_denominator": 1,
"max_group_of_pictures": 5,
"max_qp": 29,
"min_qp": 23,
"frame_qp_step": 1,
"gop_qp_step": 0,
"pic_width": 1280,
"pic_height": 720,

"h264vbr_settings": {
  "statistics_interval": 1,
  "max_bitrate": 512,
  "change_pos": 0
},
"h264cbr_settings": {
  "bitrate": 512,
  "max_fps": 10,
  "min_fps": 2,
  "ibiaslvl": 2,
  "adaptive_mode": 0,
  "gop_relation": 0
}

}],
"bindings": [
{
"note": "Bind framesource 0,0 to OSD 0,0 ",
"source": {
"device": "DEV_ID_FS",
"group": 0,
"output": 0
},
"target": {
"device": "DEV_ID_OSD",
"group": 0,
"output": 0
}
},
{
"note": "Bind OSD 0,0 to encoder 0,0",
"source": {
"device": "DEV_ID_FS",
"group": 0,
"output": 0
},
"target": {
"device": "DEV_ID_ENC",
"group": 0,
"output": 0
}
}
]
}
`

[HaLo2FrEeEk]

I've noticed this as well with an overlayed videocapture_settings file much like your own. I don't want to waste resources serving the RTSP stream as I have no plans to use anything but the MJPEG stream, but it seems that it does indeed cause the overlay to flicker...and quite annoyingly at that. I'm watching this issue to see if anyone comes up with a solution, unfortunately nothing I tried made a difference.