jleechan-skills 是做什么的？
mp4-caption-burn：将时序字幕刻录到MP4中，用于Reels/Shorts静音自动播放。
mp4-caption-burn：将时序字幕刻录到MP4中，用于Reels/Shorts静音自动播放。
该技能用于将时序字幕（如SRT或VTT格式）永久烧录到MP4视频文件中，特别针对短视频平台（如Instagram Reels、YouTube Shorts）的静音自动播放场景优化。它解决了在移动端或默认静音环境下，用户无法听到音频时依然能通过字幕理解视频内容的需求。支持的平台包括任何接受标准MP4视频的社交媒体或视频分享网站。工作原理是读取外部字幕文件，解析时间戳，并使用FFmpeg等工具将字幕渲染到视频帧上，生成一个带有内嵌字幕的新MP4文件。这对内容创作者、营销人员以及需要确保视频在无声环境下仍能传达信息的开发者非常有用。
npx skills add https://github.com/jleechanorg/jleechan-skills/tree/main/hermes/skills/media/mp4-caption-burnmp4-caption-burn：将时序字幕刻录到MP4中，用于Reels/Shorts静音自动播放。
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