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Allows users to speed up or slow down GIF playback without re-recording. Speed multiplier range is 0.25x to 4.0x (default 1.0). - Parse @set:speed:N directive in keys.sh - Validate speed range in validate.sh - Apply speed to FFmpeg filter chain via adjusted delay/frame rate - Add 9 validation tests for speed directive - Document in keys-file-format.md and gif-recording.md Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Security & validation fixes: - Add _validate_hex_color() to prevent command injection via bg_color - Add _validate_dimensions() for numeric bounds checking - Apply validation in window bar generation (Pillow & ImageMagick) FFmpeg pipeline fixes: - Fix return type: List[str] -> Tuple[List[str], List[str]] - Add format=rgba conversion before alphamerge (required for alpha) - Add speed validation to prevent division by zero - Bound effective_delay to reasonable range (1-1000) Subprocess hardening: - Add 5s timeout to ImageMagick version check - Add 30s timeout to decoration image generation - Add 10s timeout to ffprobe dimension detection - Handle FileNotFoundError and TimeoutExpired exceptions Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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