Diary on 2025-04-27

袋鼠数学竞赛成绩

今天是袋鼠数学竞赛成绩出来的日子，下午我在手机上看到通知，马上就去查询了，儿子烤了103分，获得银奖，与金奖以一分之差失之交臂，不过这也很不错，这是他数学的第一个奖项，希望他能够继续努力。

根据今年Level A的总体成绩，104就是金奖，但是儿子刚好103，没能晋级，不过这也不错，我也很高兴也很激动。

yt-dlp Tips

today I want to download all videos from a channel, both have two audio tracks and subtitles, such as English and Chinese. search internet find the tip that we can use following parameters in ~/.config/yt-dlp/config

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--audio-multistreams  -f bv+ba[language=zh-Hans]+ba[language=en-US]
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--embed-subs --write-auto-subs  --sub-langs en,zh-Hans

the full parameters are as follows:

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-o '%(playlist_index|001)s-%(title)s.%(ext)s'
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--embed-subs  --sub-langs en,zh-Hans
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--audio-multistreams  -f bv+ba[language=zh-Hans]+ba[language=en-US]
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--merge-output-format mp4
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--download-archive downloaded.txt
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-ciw
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--sleep-requests 1.5

• -ciw: Skips videos that are not available (e.g., private videos).
• --embed-subs --sub-langs en,zh-Hans: download and embed the subtitles
• --audio-multistreams -f bv+ba[language=zh-Hans]+ba[language=en-US]: download English and Chinese audio tracks, if it only have one track, we can just use --audio-multistreams -f bv+ba
• --download-archive downloaded.txt: saves to a file what videos have already been downloaded and to not do it again.