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[翻译中 by KayGuoWhu]
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How to convert video to animated gif image on Linux
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================================================================================
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Once thought of as outdated art forms, animated GIF images have now come back. If you haven't noticed, quite a few online sharing and social networking sites are now supporting animated GIF images, for example, on [Tumblr][1], [Flickr][2], [Google+][3], and [partly on Facebook][4]. Due to their ease of consumption and sharing, GIF-ed animations are now part of mainstream Internet culture.
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So some of you may wonder how you can create such animated GIF images. There are various online or offline tools dedicated to create animated GIF images. Another option is to create an animated GIF image off of an existing video clip. In this tutorial, I will describe **how to convert a video file to an animated GIF image on Linux**.
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As a more useful example, let me demonstrate how to **convert a YouTube video to an animated GIF image**.
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### Step 1: Download a YouTube Video ###
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First, download a YouTube video that you would like to convert. You can use [youtube-dl][5] tool to save a YouTube video as an MP3 file. Suppose you saved your favorite YouTube video as "funny.mp3".
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### Step 2: Extract Video Frames from a Video ###
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Next, [install FFmpeg][5] on your Linux system, which I will use to extract video frames from the video.
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The following command will extract individual video frames, and save them as GIF images. Make sure to use the output file format ("out%04d.gif") as is. That way, individual frames will be named and saved properly.
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ffmpeg -t <duration> -ss <starting position in hh:mm:ss format> -i <input_video> out%04d.gif
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For example, if you want to extract the video frames of input video, for 5 seconds, starting at 10 seconds from the beginning, run the following command.
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$ ffmpeg -t 5 -ss 00:00:10 -i funny.mp4 out%04d.gif
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After FFmpeg is completed, you will see a list of GIF files created, which are named as "out[\d+].gif".
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### Step 3: Merge Video Frames into an Animated GIF ###
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The next step is to merge individual GIF files into one animated GIF image. For that, you can use ImageMagick.
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First, [install ImageMagick][7] on your Linux system if you haven't done so.
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Then, run the following command to merge created GIF images into a single animated GIF file.
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convert -delay <ticks>x<ticks-per-second> -loop 0 out*gif <output-gif-file>
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In the command, "-delay" is an option that controls the animation speed. This option indicates that [ticks/ticks-per-second] seconds must elapse before the display of the next frame. The "-loop 0" option indicates infinite loops of animation. If you want, you can specify "-loop N", in which case the animation will repeat itself N times.
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For example, to create an animated GIF image with 20 frames-per-second and infinite loop, use the following command.
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$ convert -delay 1x20 -loop 0 out*.gif animation.gif
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### Step 4 (Optional): Reduce the Size of an Animated GIF ###
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The last (optional) step is to reduce the size of the created GIF file, by using ImageMagick's GIF optimizer.
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Use the following command to reduce the GIF size.
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convert -layers Optimize animation.gif animation_small.gif
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Now you are ready to share the GIF image on your social networks. The following shows a sample GIF image that I created from a cute YouTube video.
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Enjoy. :-)
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[][8]
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--------------------------------------------------------------------------------
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via: http://xmodulo.com/2013/11/convert-video-animated-gif-image-linux.html
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译者：[译者ID](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[1]:http://staff.tumblr.com/post/15623140287/1mb-gifs
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[2]:http://www.flickr.com/photos/markus-weldon-imagebank/4439159924/sizes/o/in/photostream/
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[3]:https://plus.google.com/communities/110524851358723545415
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[4]:http://mashable.com/2013/08/29/gifs-return-to-facebook/
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[5]:http://xmodulo.com/2013/03/how-to-save-youtube-videos-on-linux.html
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[6]:http://xmodulo.com/2013/06/how-to-install-ffmpeg-on-linux.html
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[7]:http://ask.xmodulo.com/install-imagemagick-linux.html
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[8]:http://www.flickr.com/photos/xmodulo/10988763123/
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在Linux上将视频转换成动态gif图片
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================================================================================
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虽然曾经被认为是过时的艺术形式，但动态GIF图片现在复苏了。如果你还没有留意到，不少在线分享和社交网络网站都开始支持动态GIF图片，例如，[Tumblr][1]，[Flickr][2]，[Google+][3]和[Facebook的部分地方][4]。由于在消费和共享上的容易，GIF的动画已经成为主流互联网文化的一部分了。
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所以，你们中的一些人会好奇怎样才能生成这样的动态GIF图片。已经有各种各样专门用来生成动态GIF图片的在线或离线工具。另一种选择是创建一副动态GIF图片时关闭现有的视频剪辑。在这个教程中，我会描述**在Linux上如何将一段视频文件转换成一副动态GIF图片**。
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作用一个更有用的例子，让我展示如何**将一个YouTube视频转换成一副动态GIF图片**。
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### 第一步：下载YouTube视频 ###
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首先，下载一个你想要转换的YouTube视频。你可以使用[youtube-dl][5]这个工具将YouTube视频保存为MP3文件。假设你把你最爱的YouTube视频保存为"funny.mp3"。
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### 第二步：从视频中解压视频帧 ###
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接下来，在Linux系统上[安装FFmpeg][5]，我会用这个工具去解压从视频中解压出视频帧。
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下面的指令会解压出独立的视频帧，将它们保存为GIF图片。确保使用注入("out%04d.gif")的输出文件格式。这样，独立的帧就被合适地命名并保存。
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ffmpeg -t <duration> -ss <starting position in hh:mm:ss format> -i <input_video> out%04d.gif
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例如，如果你想解压输入视频的视频帧，从第10秒开始，每5秒一帧，请运行下列命令。
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$ ffmpeg -t 5 -ss 00:00:10 -i funny.mp4 out%04d.gif
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在完成FFmpeg之后，你会看到一组创建出来的GIF文件，它们被命名为"out[\d+].gif"。
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### 第三步：合并视频帧进一副动态GIF ###
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下面这一步要合并单个的GIF文件成一副动态GIF图片。为此，你可以使用ImageMagick。
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首先，如果你还没有的话，在Linux系统上[安装ImageMagick][7]。
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convert -delay <ticks>x<ticks-per-second> -loop 0 out*gif <output-gif-file>
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在这个命令中，"-delay"是控制动态速度的选项。这个选项表示在显示下一帧画面前需要等待的［秒数］（不好翻译？）。"-loop 0"选项表示动画的无限次循环。如果你愿意，你可以指定"-loop N"让动画只重复N次。
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例如，为了生成一副每秒20帧和循环无数次的动态GIF图片，使用如下命令。
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$ convert -delay 1x20 -loop 0 out*.gif animation.gif
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### 第四步（可选）：减少动态GIF的大小 ###
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最后这一步（可选）是通过使用ImageMagick的GIF优化功能来减少生成的GIF文件的大小。
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使用下列命令去减少GIF大小。
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convert -layers Optimize animation.gif animation_small.gif
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现在你已经准备好在你的社交网络上分享制作完成的GIF图片。下面是一副我从一个可爱的YouTube视频中生成的GIF样例图片。
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享受吧！:-)
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[][8]
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--------------------------------------------------------------------------------
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via: http://xmodulo.com/2013/11/convert-video-animated-gif-image-linux.html
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译者：[KayGuoWhu](https://github.com/KayGuoWhu) 校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[1]:http://staff.tumblr.com/post/15623140287/1mb-gifs
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[2]:http://www.flickr.com/photos/markus-weldon-imagebank/4439159924/sizes/o/in/photostream/
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[3]:https://plus.google.com/communities/110524851358723545415
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[4]:http://mashable.com/2013/08/29/gifs-return-to-facebook/
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[5]:http://xmodulo.com/2013/03/how-to-save-youtube-videos-on-linux.html
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[6]:http://xmodulo.com/2013/06/how-to-install-ffmpeg-on-linux.html
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[7]:http://ask.xmodulo.com/install-imagemagick-linux.html
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[8]:http://www.flickr.com/photos/xmodulo/10988763123/
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