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What I learned adding diagram and chart slides to a CI-rendered YouTube pipeline

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The conclusion first: pre-rendering diagrams and charts to PNG before compositing them onto slides — rather than generating visual content inline or inside ffmpeg — is the right architecture for a CI video pipeline. The tooling gap between Chromium-backed Mermaid rendering, headless matplotlib, and ffmpeg's static frame expectation makes a shared PNG handoff the only approach that keeps each piece testable and replaceable. I added three new slide types to the YouTube slide renderer last week: diagram (Mermaid flowcharts and sequence diagrams), chart (branded horizontal bar charts via matplotli

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What I learned adding diagram and chart slides to a CI-rendered YouTube pipeline · ShortSingh