Faster export pipeline with parallel IO, cached offsets, and CPU RGBA→NV12#1786

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richiemcilroy wants to merge 17 commits intomainfrom

Commits on May 8, 2026

perf(enc-ffmpeg): skip BufferedResampler when conversion is identity
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perf(rendering): add rgba_to_nv12_fast CPU conversion
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perf(rendering): parallelize segment meta load and add first_camera_duration
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test(rendering): verify lazy zoom precompute matches full precompute
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perf(rendering): cache clip offsets and accelerate NV12 readback conversion
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fix(rendering): order readback wait after submit in finish_encoder paths
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fix(audio): handle resampler flush loops and propagate decode EOF errors
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perf(audio): batch stereo mix using prepared linear gains
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perf(editor): render audio in-place with cached clip offsets
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perf(editor): load segment audio concurrently with decoder setup
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refactor(editor): use first_camera_duration for recording length bound
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chore(editor): re-export AudioSegment from crate root
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build(export): add cap-audio dev dependency for benchmarks
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perf(export): parallelize renderer setup with segment loading
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perf(export): speed NV12 pipeline and widen export frame channel
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chore(export): add CPU startup profiling example binary
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chore(export): add encoder benchmark example binary
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