fix: legacy渲染引擎concat前音频不归一化exit=234 + 视频改为pad留黑边 #503

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auto-approve-bot merged 1 commits from fix/legacy-audio-normalize-and-pad into develop 2026-07-18 13:52:11 +08:00

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Author SHA1 Message Date
CI Bot cb3b8d4a77 fix: legacy渲染引擎concat前音频不归一化导致exit=234 + 视频改为pad留黑边
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音频归一化(exit=234根因):
- concat前每个音频流加aformat滤镜,统一为48000Hz + stereo + fltp
- 不同采样率/声道数的音频直接concat会导致FFmpeg退出码234

视频改为pad留黑边:
- scale force_original_aspect_ratio=decrease(等比缩小,不裁剪)
- pad到目标分辨率,居中+黑边填充
- 确保横屏/竖屏/任何分辨率素材都能正常出片,不丢失内容

关联 #406
2026-07-18 13:47:21 +08:00