vault backup: 2025-03-04 11:17:00

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2025-03-04 11:17:00 +08:00
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`av_opt_set()` 可以設定很多東西,例如:
```cpp
av_opt_set(codecContext, "preset", "ultrafaset", 0); // 速度慢,高品質
av_opt_set(codecContext, "tune", "fastdecode", 0);
av_opt_set(avStream->codecContext->priv_data, "profile", "baseline", 0);
```
詳細請看[Encode/H.264 FFmpeg](https://trac.ffmpeg.org/wiki/Encode/H.264)。