add ffmpeg cheatsheet

README.md

@@ -6,5 +6,8 @@ Source for www.alexandrostheodotou.com
 # Build
 `make html`
 
+# Dependencies
+* pelican
+
 # Deploy
 `SSH_USER=<user> SSH_HOST=<host> SSH_TARGET_DIR=<target-dir> make rsync_upload`

content/ffmpeg-cheatsheet.rst

@@ -0,0 +1,32 @@
+Ffmpeg Cheatsheet
+#################
+
+:date: 2021-03-13 17:40
+:tags: ffmpeg, video
+:category: video
+:slug: ffmpeg-cheatsheet
+:authors: Alexandros Theodotou
+:summary: Commands for doing various things with video using ffmpeg
+
+This is a list of commands for editing video using ffmpeg.
+
+Cut and Fade
+------------
+Start the video at minute 1, make it last 20 seconds and fade the
+first and last 4 seconds of audio and video:
+
+.. code-block:: bash
+
+  ffmpeg \
+    # start at minute 1
+    -ss 00:01:00 \
+    # duration 20 seconds
+    -t 20 \
+    # input video
+    -i myinvideo.webm \
+    # audio fade
+    -af "afade=in:d=4,afade=t=out:st=16:d=4" \
+    # video fade
+    -vf "fade=in:d=4,fade=out:st=16:d=4" \
+    # output video
+    myoutvideo.webm