Refactored _render_pause_insert to execute FFmpeg operations in parallel
phases instead of sequentially:
Phase 1: Parallel extraction
- Generate shared silence (once, reused by all)
- Extract ALL video segments simultaneously
- Extract ALL freeze frames simultaneously
- Extract final segment
Phase 2: Parallel audio concatenation
- Concatenate ALL audio tracks (silence + AD + silence) simultaneously
Phase 3: Parallel freeze segment creation
- Create ALL freeze segments simultaneously
Phase 4: Assemble segments in correct order for final concatenation
This reduces render time from ~3 minutes (serial) to ~30 seconds (parallel)
for an 8-cue video when using Cloud Run FFmpeg service.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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