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Enhancement: Add two-pass hardware encoding for quality-critical jobs #48

Description

@wmehanna

Research Summary

After researching FFmpeg hardware acceleration best practices, BitBonsai already has strong hardware acceleration support (NVENC, QSV, VAAPI), but there are two enhancements that would differentiate it from Tdarr/FileFlows:

Two-Pass Encoding for Quality-Critical Jobs

Current State: Single-pass encoding with quality-based rate factor
Benefit: More consistent quality across frames, better quality-per-bit ratio
Implementation: Add a "Quality Mode" checkbox that uses two-pass encoding via /

This is especially useful for:

  • Archive-quality encodes where bitrate savings matter
  • Maintaining VMAF scores above 90

Research Sources:

Would you like me to implement this? --label enhancement

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