feat: #1767 BGM 池差异化分配，打破变体间音频指纹一致性 #1785
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merged 1 commits from 2026-09-08 10:12:53 +08:00
fix/1767-bgm-pool-diversify into develop
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| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
 xiaoxia
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91c67f0af4 |
feat: #1767 BGM 池差异化分配，打破变体间音频指纹一致性
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三层递进策略： - 策略一（核心）：10 首 BGM 池，按源 BGM 风格筛选候选，每变体基于 variantSeed 分配不同 BGM - 策略二（补充）：段落差异化，不同变体从同一 BGM 的不同偏移位置开始播放（5s 量化，最大 30s） - 策略三：音量微调 ±3dB 离散步进，混音比例有微小差异 代码改动： - 新增 packages/domain/bgm_pool.py：BGM 池定义 + 风格匹配 + 变体分配 + 段落偏移 + 音量微调 - bgm_mixer.py：BGMConfig 加 audio_offset/volume_adjust_db，prepare_bgm_track 支持 -ss seek 和 dB volume 滤镜 - edit_plan_service.py：ensure_batch_variant_plans 中调用 allocate_bgm_pool_for_variants，写入 plan.config['bgm'] 31 个新单测覆盖池定义/风格匹配/分配/段落偏移/音量微调/验收条件 约束：不破坏单视频 BGM 选择逻辑；BGM 风格匹配源 plan；分配可复现 |