vid-scratch: Add consolidated versions of my experiments from 2025-02-XXlukeshu/vid-scratch

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+I need to select a video file format to use.  I have the following
+requirements:
+
+ - Each frame is an uncompressed 8bpp RGB framebuffer.  The CPU does
+   not have enough cycles to process the framebuffer in any way; I
+   need to be able to DMA the framebuffer straight into the file
+   stream, without the pixel data going through the main CPU.
+
+ - The pixels are non-square; each pixel is twice as tall as it is
+   wide.
+
+ - VFR (Variable Frame Rate), up to a maximum of 60 FPS.
+
+ - The resolution must be able to change mid-stream, between the
+   pre-determined values 640x480, 720x480, and 720x576.  This is the
+   display-resolution; because of non-square pixels, the framebuffer
+   for each would be 640x240, 720x240, and 720x288, respectively.
+
+ - The resulting video file must be playable using standard/common
+   video players (such as vlc or mpv) and tools (such as ffmpeg)
+   without any special flags or settings.