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fix: Canvas播放器修复 - 片段自动切换+宽高比+移除死代码+进度节流 #1437

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xiaoxia wants to merge 1 commits from fix/canvas-player-issues into develop
pull from: fix/canvas-player-issues
merge into: xiaoxia:develop
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Author SHA1 Message Date
张宏杰 a07d6c9a87 fix: Canvas播放器修复 - 片段自动切换+宽高比+移除死代码+进度节流
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1. 片段自动切换：初始化时加载所有片段数据并逐段解码，帧时间戳按全局偏移对齐
2. Canvas宽高比：computeDrawRect计算letterbox/pillarbox，保持视频原始比例
3. 移除未使用的audioCtxRef/audioSourceRef（音频由外部HTMLAudio处理）
4. 进度更新节流到200ms(5fps)，减少React re-render
5. FrameQueue容量从5提升到10，多片段场景更流畅
6. fallback路径优化预加载：当前片段auto/下一个metadata/其余none
 2026-08-19 12:48:36 +08:00