Figured out how to do bidirectional communication with a subprocess using Win32 API. POSIX version still to do. Now I can pipe raw PPM image streams to FFmpeg and display the output logs in my program. Did some fiddly things too to stop a flood of status lines (in a terminal they are overwritten in place using carriage return without newline). Also made a simple Dear ImGui theme function, so my UI is red when recording, green when playing, and blue when idle.
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