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How To Create A Video From PDF Files In Linux
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======
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I have a huge collection of PDF files, mostly Linux tutorials, in my tablet PC. Sometimes I feel too lazy to read them from the tablet. I thought It would be better If I can be able to create a video from PDF files and watch it in a big screen devices like a TV or a Computer. Though I have a little working experience with [**FFMpeg**][1], I am not aware of how to create a movie file using it. After a bit of Google searches, I came up with a good solution. For those who wanted to make a movie file from a set of PDF files, read on. It is not that difficult.
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### Create A Video From PDF Files In Linux
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For this purpose, you need to install **" FFMpeg"** and **" ImageMagick"** software in your system.
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To install FFMpeg, refer the following link.
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Imagemagick is available in the official repositories of most Linux distributions.
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On **Arch Linux** and derivatives such as **Antergos** , **Manjaro Linux** , run the following command to install it.
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```
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sudo pacman -S imagemagick
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```
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**Debian, Ubuntu, Linux Mint:**
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```
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sudo apt-get install imagemagick
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```
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**Fedora:**
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```
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sudo dnf install imagemagick
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```
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**RHEL, CentOS, Scientific Linux:**
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```
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sudo yum install imagemagick
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```
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**SUSE, openSUSE:**
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```
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sudo zypper install imagemagick
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```
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After installing ffmpeg and imagemagick, convert your PDF file image format such as PNG or JPG like below.
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```
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convert -density 400 input.pdf picture.png
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```
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Here, **-density 400** specifies the horizontal resolution of the output image file(s).
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The above command will convert all pages in the given PDF file to PNG format. Each page in the PDF file will be converted into a PNG file and saved in the current directory with file name **picture-1.png** , **picture-2.png** … and so on. It will take a while depending on the number of pages in the input PDF file.
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Once all pages in the PDF converted into PNG format, run the following command to create a video file from the PNG files.
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```
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ffmpeg -r 1/10 -i picture-%01d.png -c:v libx264 -r 30 -pix_fmt yuv420p video.mp4
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```
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Here,
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* **-r 1/10** : Display each image for 10 seconds.
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* **-i picture-%01d.png** : Reads all pictures that starts with name **" picture-"**, following with 1 digit (%01d) and ending with **.png**. If the images name comes with 2 digits (I.e picture-10.png, picture11.png etc), use (%02d) in the above command.
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* **-c:v libx264** : Output video codec (i.e h264).
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* **-r 30** : framerate of output video
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* **-pix_fmt yuv420p** : Output video resolution
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* **video.mp4** : Output video file with .mp4 format.
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Hurrah! The movie file is ready!! You can play it on any devices that supports .mp4 format. Next, I need to find a way to insert a cool music to my video. I hope it won't be difficult either.
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If you wanted it in higher pixel resolution, you don't have to start all over again. Just convert the output video file to any other higher/lower resolution of your choice, say 720p, as shown below.
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```
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ffmpeg -i video.mp4 -vf scale=-1:720 video_720p.mp4
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```
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Please note that creating a video using ffmpeg requires a good configuration PC. While converting videos, ffmpeg will consume most of your system resources. I recommend to do this in high-end system.
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And, that's all for now folks. Hope you find this useful. More good stuffs to come. Stay tuned!
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--------------------------------------------------------------------------------
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via: https://www.ostechnix.com/create-video-pdf-files-linux/
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作者：[SK][a]
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译者：[译者ID](https://github.com/译者ID)
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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) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.ostechnix.com/author/sk/
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[1]:https://www.ostechnix.com/20-ffmpeg-commands-beginners/
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@ -0,0 +1,89 @@
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如何在 Linux 中从 PDF 创建视频
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======
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我在我的平板电脑中收集了大量的 PDF 文件，其中主要是 Linux 教程。有时候我懒得在平板电脑上看。我认为如果我能够从 PDF 创建视频，并在大屏幕设备（如电视机或计算机）中观看会更好。虽然我对 [**FFMpeg**][1] 有一些经验，但我不知道如何使用它来创建视频。经过一番 Google 搜索，我想出了一个很好的解决方案。对于那些想从一组 PDF 文件制作视频文件的人，请继续阅读。这并不困难。
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### 在 Linux 中从 PDF 创建视频
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为此，你需要在系统中安装 **“FFMpeg”** 和 **“ImageMagick”** 。
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要安装 FFMpeg，请参考以下链接。
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Imagemagick 可在大多数 Linux 发行版的官方仓库中找到。
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在 **Arch Linux** 以及 **Antergos** 、**Manjaro Linux** 等衍生产品上，运行以下命令进行安装。
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```
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sudo pacman -S imagemagick
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```
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**Debian、Ubuntu、Linux Mint：**
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```
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sudo apt-get install imagemagick
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```
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**Fedora：**
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```
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sudo dnf install imagemagick
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```
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**RHEL、CentOS、Scientific Linux：**
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```
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sudo yum install imagemagick
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```
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**SUSE、 openSUSE：**
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```
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sudo zypper install imagemagick
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```
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在安装 ffmpeg 和 imagemagick 之后，将你的 PDF 文件转换成图像格式，如 PNG 或 JPG，如下所示。
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```
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convert -density 400 input.pdf picture.png
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```
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这里，**-density 400** 指定输出图像的水平分辨率。
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上面的命令会将指定 PDF 的所有页面转换为 PNG 格式。PDF 中的每个页面都将被转换成 PNG 文件，并保存在当前目录中，文件名为： **picture-1.png**、 **picture-2.png** 等。根据选择的 PDF 的页数，这将需要一些时间。
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将 PDF 中的所有页面转换为 PNG 格式后，运行以下命令以从 PNG 创建视频文件。
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```
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ffmpeg -r 1/10 -i picture-%01d.png -c:v libx264 -r 30 -pix_fmt yuv420p video.mp4
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```
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这里：
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* **-r 1/10** ：每张图像显示 10 秒。
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* **-i picture-%01d.png** ：读取以 **“picture-”** 开头，接着是一位数字（％01d），最后以 **.png** 结尾的所有图片。如果图片名称带有2位数字（也就是 picture-10.png、picture11.png 等），在上面的命令中使用（％02d）。
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* **-c:v libx264**：输出的视频编码器（即 h264）。
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* **-r 30** ：输出视频的帧率
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* **-pix_fmt yuv420p**：输出的视频分辨率
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* **video.mp4**：以 .mp4 格式输出视频文件。
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好了，视频文件完成了！你可以在任何支持 .mp4 格式的设备上播放它。接下来，我需要找到一种方法来为我的视频插入一个很酷的音乐。我希望这也不难。
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如果你想要更高的分辨率，你不必重新开始。只要将输出的视频文件转换为你选择的任何其他更高/更低的分辨率，比如说 720p，如下所示。
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```
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ffmpeg -i video.mp4 -vf scale=-1:720 video_720p.mp4
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```
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请注意，使用 ffmpeg 创建视频需要一台配置好的 PC。在转换视频时，ffmpeg 会消耗大量系统资源。我建议在高端系统中这样做。
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就是这些了。希望你觉得这个有帮助。还会有更好的东西。敬请关注！
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--------------------------------------------------------------------------------
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via: https://www.ostechnix.com/create-video-pdf-files-linux/
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作者：[SK][a]
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译者：[geekpi](https://github.com/geekpi)
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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) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.ostechnix.com/author/sk/
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[1]:https://www.ostechnix.com/20-ffmpeg-commands-beginners/
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