{"id":638,"date":"2015-05-02T11:42:00","date_gmt":"2015-05-02T15:42:00","guid":{"rendered":"https:\/\/www.devolve.net\/blog\/?p=638"},"modified":"2016-05-22T15:11:21","modified_gmt":"2016-05-22T19:11:21","slug":"raspberry-pi-fast-video-encoding","status":"publish","type":"post","link":"https:\/\/www.devolve.local\/raspberry-pi-fast-video-encoding\/","title":{"rendered":"Raspberry Pi can do fast video encoding"},"content":{"rendered":"<p>Yes, the Raspberry Pi <em>can<\/em> do fast video encoding. Of course you normally wouldn&#8217;t want to re-encode any video with an ARM processor, but that&#8217;s not what we&#8217;re going to do here. We&#8217;re going to leverage the GPU. I should point out before proceeding that the input formats for re-encoding are limited in this method, more about that below.<\/p>\n<p>In order to do this, I&#8217;m using a proof-of-concept tool called <a href=\"https:\/\/github.com\/dickontoo\/omxtx\" target=\"_blank\">omxtx<\/a>, which I think is supposed to be a shortened form of &#8220;OpenMAX Transcoding&#8221;. Off the top of my head, here are the prerequisites for building the binary from source:<\/p>\n<ul>\n<li>Raspbian. It will probably work on other RPi distros, but I haven&#8217;t tried them.<\/li>\n<li>The <code>build-essential<\/code> package installed, which you normally need to build anything.<\/li>\n<li>Memory split of 64MB for video. I previously had this all the way down to 16 since I don&#8217;t use a display on my Pi, but bumping it to only 32MB caused runtime errors from the omxtx binary. You need to give the GPU some breathing room to encode video.<\/li>\n<li>There&#8217;s probably some libraries you may or may not have installed that the build wants to link in. When I run <code>ldd<\/code> on my finished binary, it loads all kinds of media libs like libav, libvorbis, libvpx, etc. YMMV.<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<p>Once you&#8217;ve run <code>git clone URL<\/code> or just grabbed &amp; unzipped the master.zip from the Github page, go the the directory and just try running <code>make<\/code> to see if it works. With luck, in about 30 seconds you should have a working <code>omxtx<\/code> binary that you can drop into one of your <code>PATH<\/code>s like \/usr\/local\/bin or ~\/bin.<\/p>\n<p>Running it without any arguments shows the command usage, available options, and the input formats. As I mentioned at the top of this post, the input formats are limited, but I tried running it on a video encoded with XVID, and it seems to work mostly fine. I think the output mp4 file may just have been missing the final one or two frames from the original.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yes, the Raspberry Pi can do fast video encoding. Of course you normally wouldn&#8217;t want to re-encode any video with an ARM processor, but that&#8217;s not what we&#8217;re going to do here. We&#8217;re going to leverage the GPU. I should point out before proceeding that the input formats for re-encoding are limited in this method, [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[34,16,31,22],"_links":{"self":[{"href":"https:\/\/www.devolve.local\/wp-json\/wp\/v2\/posts\/638"}],"collection":[{"href":"https:\/\/www.devolve.local\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.devolve.local\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.devolve.local\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devolve.local\/wp-json\/wp\/v2\/comments?post=638"}],"version-history":[{"count":4,"href":"https:\/\/www.devolve.local\/wp-json\/wp\/v2\/posts\/638\/revisions"}],"predecessor-version":[{"id":730,"href":"https:\/\/www.devolve.local\/wp-json\/wp\/v2\/posts\/638\/revisions\/730"}],"wp:attachment":[{"href":"https:\/\/www.devolve.local\/wp-json\/wp\/v2\/media?parent=638"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devolve.local\/wp-json\/wp\/v2\/categories?post=638"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devolve.local\/wp-json\/wp\/v2\/tags?post=638"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}