SDR Analog Video Decoding Adventures
summary
Builds a working remote HDMI viewer and a PAL decoder for NES using an Airspy R2 at 10 MSPS, showing HDMI emanations map to predictable amplitude codewords and can be synchronized into frames. Implements AM demod, a narrow notch to remove aliased FM audio, heavy bandpass FIRs for chroma, Liquid‑DSP and SDL textures, and runs real time at 50 fps on a 2013 MacBook Pro. Color decoding is imperfect (copies chroma from alternating lines initially), filters are CPU‑heavy (1000 coefficients), and HDMI2/DP encryption would prevent this.
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chapters (9)
- 0:00Intro
- 0:34what to expect
- 2:15background
- 9:26Remote HDMI viewer: Shortcomings
- 12:29Nothing new
- 14:13PAL capture
- 15:43Some PAL signal basics...
- 23:53Performance considerations
- 24:54Future directions
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