{"id":1332,"date":"2020-12-09T10:06:17","date_gmt":"2020-12-09T02:06:17","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=1332"},"modified":"2020-12-09T10:06:17","modified_gmt":"2020-12-09T02:06:17","slug":"ffmpeg%e7%ae%80%e5%8d%95%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=1332","title":{"rendered":"ffmpeg\u7b80\u5355\u4f7f\u7528"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>\u5c06\u89c6\u9891 MP4 \u8f6c\u5316\u4e3a GIF\nffmpeg -i small.mp4 small.gif\n\u8f6c\u5316\u89c6\u9891\u4e2d\u7684\u4e00\u90e8\u5206\u4e3a GIF\nffmpeg -t 3 -ss 00:00:02 -i small.webm small-clip.gif\n\u4ece\u89c6\u9891\u4e2d\u7b2c\u4e8c\u79d2\u5f00\u59cb\uff0c\u622a\u53d6\u65f6\u957f\u4e3a3\u79d2\u7684\u7247\u6bb5\u8f6c\u5316\u4e3a gif\n\n\u8f6c\u5316\u9ad8\u8d28\u91cf GIF\n\u9ed8\u8ba4\u8f6c\u5316\u662f\u4e2d\u7b49\u8d28\u91cf\u6a21\u5f0f\uff0c\u82e5\u8981\u8f6c\u5316\u51fa\u9ad8\u8d28\u91cf\u7684 gif\uff0c\u53ef\u4ee5\u4fee\u6539\u6bd4\u7279\u7387\n\nffmpeg -i small.mp4 -b 2048k small.gif\n\u89c6\u9891\u5c5e\u6027\u8c03\u6574\n\u7f29\u653e\u89c6\u9891\u5c3a\u5bf8\nffmpeg -i big.mov -vf scale=360:-1  small.mov\n\u6ce8\u610f sacle \u503c\u5fc5\u987b\u662f\u5076\u6570\uff0c\u8fd9\u91cc\u7684 -1 \u8868\u793a\u4fdd\u6301\u957f\u5bbd\u6bd4\uff0c\u6839\u636e\u5bbd\u5ea6\u503c\u81ea\u9002\u5e94\u9ad8\u5ea6\u3002\n\n\u5982\u679c\u8981\u6c42\u538b\u7f29\u51fa\u6765\u7684\u89c6\u9891\u5c3a\u5bf8\u957f\u5bbd\u90fd\u4fdd\u6301\u4e3a\u5076\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528 -2\n\n\u52a0\u500d\u901f\u64ad\u653e\u89c6\u9891\nffmpeg -i input.mov -filter:v \"setpts=0.5*PTS\" output.mov\n\u5b9a\u4e49\u5e27\u7387 16fps:\n\nffmpeg -i input.mov -r 16 -filter:v \"setpts=0.125*PTS\" -an output.mov\n\u6162\u500d\u901f\u64ad\u653e\u89c6\u9891\nffmpeg -i input.mov -filter:v \"setpts=2.0*PTS\" output.mov\n\u9759\u97f3\u89c6\u9891\uff08\u79fb\u9664\u89c6\u9891\u4e2d\u7684\u97f3\u9891\uff09\nffmpeg -i input.mov -an mute-output.mov\n-an \u5c31\u662f\u7981\u6b62\u97f3\u9891\u8f93\u51fa\n\n\u5c06 GIF \u8f6c\u5316\u4e3a MP4\nffmpeg -f gif -i animation.gif animation.mp4\n\u4e5f\u53ef\u4ee5\u5c06 gif \u8f6c\u4e3a\u5176\u4ed6\u89c6\u9891\u683c\u5f0f\n\nffmpeg -f gif -i animation.gif animation.mpeg\n\nffmpeg -f gif -i animation.gif animation.webm\n\u83b7\u53d6 GIF \u7684\u7b2c\u4e00\u5e27\u56fe\u7247\n\u4f7f\u7528 ImageMagick \u53ef\u4ee5\u65b9\u4fbf\u7b2c\u63d0\u53d6 gif \u56fe\u7247\u7684\u7b2c N \u5e27\u56fe\u50cf\u3002\n\n\u5b89\u88c5 ImageMagick\n\nbrew install imagemagick\n\u63d0\u53d6\u7b2c\u4e00\u5e27\n\nconvert 'animation.gif&#91;0]' animation-first-frame.gif\n\u901a\u8fc7 &#91;0] \u5c31\u53ef\u4ee5\u63d0\u53d6\u51fa gif \u7684\u7b2c\u4e00\u5e27\u56fe\u50cf\u3002\n\n\u6765\u81ea\uff1ahttps:\/\/www.jianshu.com\/p\/73441acf7815<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[83],"_links":{"self":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1332"}],"collection":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1332"}],"version-history":[{"count":1,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1332\/revisions"}],"predecessor-version":[{"id":1333,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1332\/revisions\/1333"}],"wp:attachment":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}