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diff --git a/ffmpeg.md b/ffmpeg.md
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 # ffmpeg tricks
 
+## Cut
+
+    ffmpeg -i in.mp4 -codec:v copy -codec:a copy -ss START_TIME -t DURATION out.mp4
+    ffmpeg -ss START_TIME -t DURATION -i in.mp4 -codec:v copy -codec:a copy out.mp4
+
+## Resize
+
+    ffmpeg -i in.mp4 -s 720x480 out.mp4
+    # -1 means to automatically preserve aspect ratio
+    ffmpeg -i in.mp4 -filter:v scale=720:-1 out.mp4
+
 ## Record screen
 
     ffmpeg -f x11grab -s 1920x1080 -i :0.0 out.mkv