From 455bd1044090252cb3fb63bb7f9067fd0d58db34 Mon Sep 17 00:00:00 2001
From: mlerik <baerenjesus@gmail.com>
Date: Thu, 18 Jul 2019 14:40:04 +0000
Subject: [PATCH] Update video_generation.md

---
 .../misc/generate_video/video_generation.md   | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/examples/misc/generate_video/video_generation.md b/examples/misc/generate_video/video_generation.md
index e69de29b..9bd16084 100644
--- a/examples/misc/generate_video/video_generation.md
+++ b/examples/misc/generate_video/video_generation.md
@@ -0,0 +1,38 @@
+# Making Videos from Env
+
+In order to generate Videos or gifs, it is easiest to generate image files and then run ffmpeg to generate a video.
+
+## 1. Generating Images from Env
+
+Start by importing the render and instantiating it
+
+```
+from flatland.utils.rendertools import RenderTool
+env_renderer = RenderTool(env, gl="PILSVG", )
+```
+
+If the environment changes don't forget to reset the renderer
+```
+env_renderer.reset()
+```
+
+You can now record an image after every step. It is best to use a format similar to the one below, where `frame_step` is counting the number of steps.
+```
+env_renderer.gl.save_image("./Images/Avoiding/flatland_frame_{:04d}.bmp".format(frame_step))
+```
+
+Once the images have been saved to the folder you can run a shell from that folder and run the following commands.
+
+Generate a mp4 out of the images:
+```
+ffmpeg -y -framerate 12 -i flatland_frame_%04d.bmp -hide_banner -c:v libx264 -pix_fmt yuv420p test.mp4
+```
+
+Generate a palette out of the video necessary to generate beautiful gifs:
+```
+ffmpeg  -i test.mp4 -filter_complex "[0:v] palettegen" palette.png
+```
+and finaly generate the gif
+```
+ffmpeg -i test.mp4 -i palette.png -filter_complex "[0:v][1:v] paletteuse" single_agent_navigation.gif
+```
-- 
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