{"categories":["\u30e1\u30e2"],"title":"ffmpeg\u3067\u77e5\u3063\u305f\u3053\u3068\u3044\u304f\u3064\u304b\uff08\u30e1\u30e2\uff09","type":"rich","author_url":"https://blog.hatena.ne.jp/ke_takahashi/","author_name":"ke_takahashi","height":"190","blog_title":"memorandums","version":"1.0","url":"https://memorandums.hatenablog.com/entry/2025/12/04/132957","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmemorandums.hatenablog.com%2Fentry%2F2025%2F12%2F04%2F132957\" title=\"ffmpeg\u3067\u77e5\u3063\u305f\u3053\u3068\u3044\u304f\u3064\u304b\uff08\u30e1\u30e2\uff09 - memorandums\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2025-12-04 13:29:57","provider_name":"Hatena Blog","description":"\u97f3\u7121\u3057\u3059\u308b ffmpeg -i src.mp4 -vcodec copy -an dist.mp4 \u518d\u751f\u901f\u5ea6\u3092\u534a\u5206\u306b\u3059\u308b ffmpeg -i src.mp4 -vf setpts=PTS/0.5 -af atempo=0.5 dist.mp4 \u518d\u751f\u901f\u5ea6\u3092\u534a\u5206\u306b\u3057\u3066\u97f3\u7121\u3057\u306b\u3059\u308b ffmpeg -i src.mp4 -vf setpts=PTS/0.5 -an dist.mp4","width":"100%","provider_url":"https://hatena.blog","image_url":null,"blog_url":"https://memorandums.hatenablog.com/"}