diff --git a/ffmpeg.md b/ffmpeg.md
index cd7476c..8de715e 100644
--- a/ffmpeg.md
+++ b/ffmpeg.md
@@ -1,6 +1,11 @@
 # ffmpeg
 
-- Hardware accelerated MP4 video conversion
+## Split video at marks
+```
+ffmpeg -ss 00:00:00 -to 99:99:99 -i input.mp4 -c copy output.mp4
+```
+
+## Hardware accelerated MP4 video conversion
 ```
 ffmpeg -i input_video.webm -vaapi_device /dev/dri/renderD128 -vcodec h264_vaapi -vf format='nv12|vaapi,hwupload' output_video.mp4
 ```