Add Timestamp to stream OSD @ Ingest

[marcoherbst]

Similar to undistorting.

Using different cameras we're getting different qualities of timestamp.

Let's offer the option to ingest an image with no timestamp and to add the NVR timestamp.

Benefit 1: It will be more beautiful and consistent accross cameras
Benefit 2: We remove one possible source of confusion (a camera with the wrong time settings).

[gBillal]

Unfortunately there's a downside of decoding/encoding again which is impossible in Raspberry pi and it'll consume a lot of resources for Jetson.

[marcoherbst]

We have to try. If it means putting more powerful hardware on the edge, so be it. Let's try, get the data and then better understand our next actions. We will be making this functionality.

[marcoherbst]

https://github.com/membraneframework/membrane_ffmpeg_video_filter_plugin

TextOverlay element is implemented, based on ffmpeg drawtext filter. This element enables adding text on top of given raw video frames.

In this example they use HTML to define an overlay. That seems clever:
https://developer.ridgerun.com/wiki/index.php/OpenGL_Accelerated_HTML_Overlay/Basics
https://shop.ridgerun.com/products/htmloverlay?variant=44683564646587

Also:
https://compositor.live/ (Part of Membrane)