{"title":"\u900f\u904e\u4ed8\u304d\u306e\u52d5\u753b\u30d5\u30a1\u30a4\u30eb(WebM)\u306e\u4f5c\u6210\u65b9\u6cd5","author_url":"https://blog.hatena.ne.jp/nakamura001/","provider_name":"Hatena Blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnakamura001.hatenablog.com%2Fentry%2F20170403%2F1491218822\" title=\"\u900f\u904e\u4ed8\u304d\u306e\u52d5\u753b\u30d5\u30a1\u30a4\u30eb(WebM)\u306e\u4f5c\u6210\u65b9\u6cd5 - \u5f37\u706b\u3067\u9032\u3081\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","categories":[],"published":"2017-04-03 20:27:02","provider_url":"https://hatena.blog","author_name":"nakamura001","url":"https://nakamura001.hatenablog.com/entry/20170403/1491218822","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/n/nakamura001/20170403/20170403195557.png","blog_url":"https://nakamura001.hatenablog.com/","width":"100%","height":"190","blog_title":"\u5f37\u706b\u3067\u9032\u3081","version":"1.0","type":"rich","description":"\u6025\u3044\u3067\u308b\u4eba\u5411\u3051 \u914d\u5e03\u30d5\u30a1\u30a4\u30eb \u3053\u3053\u306b VP8 \u3068 VP9 \u30b3\u30fc\u30c7\u30c3\u30af\u306e\u900f\u904e\u4ed8\u304d WebM \u30d5\u30a1\u30a4\u30eb\u3092\u7f6e\u3044\u3066\u3044\u308b\u306e\u3067\u304a\u4f7f\u3044\u4e0b\u3055\u3044\u3002 \u81ea\u4f5c \u3082\u3057\u304f\u306f\u9023\u756a\u306e\u900f\u904e\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u3092\u6e96\u5099\u3057\u305f\u5f8c\u306b FFmpeg \u3092\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3067\u5b9f\u884c\u3057\u3066\u4f5c\u6210\u3002 ffmpeg -r 30 -i frame%04d.png -auto-alt-ref 0 -c:v libvpx output.webm\u25a0\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u89e3\u8aac \u30aa\u30d7\u30b7\u30e7\u30f3 \u8aac\u660e -r \u30d5\u30ec\u30fc\u30e0\u30ec\u30fc\u30c8 -i \u5165\u529b\u30c7\u30fc\u30bf -auto-alt-ref alternate reference frames(2-pass only)\u30020=\u7121\u52b9\u30011=\u6709\u52b9 -c:v \u30b3\u30fc\u30c7\u30c3\u30af\u306e\u6307\u5b9a\u2026"}