Lex Fridman Podcast

Podbit · Lex Fridman Podcast

#496 – FFmpeg: The Incredible Technology Behind Video on the Internet

Explore episode May 6, 2026
True Crime
The CIA Used a Modified VLC to Spy on People

#496 – FFmpeg: The Incredible Technology Behind Video on th… · May 6, 2026 True Crime

WikiLeaks' Vault 7 revealed that the CIA distributed a custom VLC build with a hidden DLL that read your documents folder and encrypted and exfiltrated the data — while you watched a movie for two hours and blamed your fans on the CPU load. VideoLAN's only defense was telling people to only download from videolan.org.

Where this was said

Assembly code (handwritten)

At 2:40:36 · chapter starts 2:06:21

Why SIMD assembly beats C by 62x; dav1d's 240,000 lines of handwritten assembly; Henrik Gramner and Martin Storsjö as assembly wizards; the Moore's Law plateau making optimization essential.

Technology
dav1d: 240,000 Lines of Handwritten Assembly for AV1

#496 – FFmpeg: The Incredible Technology Behind Video on th… · May 6, 2026 Technology

When the Alliance for Open Media said AV1 was too complex for software decoding, VideoLAN proved them wrong with dav1d: 240,000 lines of handwritten assembly, every cycle optimized, running on 3 billion devices. It enables 720p AV1 decoding on just one or two CPU cores — on hardware that was never supposed to handle it.

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