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every.channel 2026-02-15 16:17:27 -05:00
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# ECP-0005: deterministic chunking pipeline
Status: Draft
## Problem
We need a deterministic encoding and chunking pipeline so that identical broadcasts produce identical objects across relays.
## Decision
Adopt a deterministic chunking profile with the following constraints:
- Single-threaded encoding by default.
- Fixed GOP cadence and keyframe placement.
- Bitexact flags enabled wherever possible.
- Fixed chunk duration (default 2 seconds) and stable object naming.
Initial implementation uses ffmpeg CLI piping into the ac-ffmpeg chunker for rapid iteration, while the primary goal is to move to libav bindings for deeper control and determinism validation.
## Alternatives considered
- Multithreaded encoders: rejected because they reduce reproducibility.
- Hardware encoders: deferred because determinism is uncertain.
- HLS segmentation: rejected as the primary format; MoQ objects will be derived directly.
## Rollout / teardown
- Introduce `ec-chopper` with a deterministic profile and ffmpeg-based segmenter.
- Measure determinism with repeated runs.
- Replace the CLI with libav bindings once the control surface is verified.