==== How to use ffmpeg ====

Most of this is from [[https://ostechnix.com/20-ffmpeg-commands-beginners/|here]] eh.

=== Basic usage ===

  ffmpeg -i source.mp4 OPTIONS output.mp4

=== Important options ===

Use h.264 encoding

<code>-c:v libx264</code>

Processing speed

<code>-preset slow</code>

Adjust volume:

<code>-af 'volume=1.2'</code>

Scale the resolution (use -2 if the resolution doesn't divide well):

<code>-vf scale=-1:720</code>

Stretch the resolution (setsar tells player not to squish later):

<code>-vf "scale=1280:760,setsar=1"</code>

Quality setting (27 is probably okay)

<code>-crf 27</code>

Start and stop times (trim video)

<code>-ss 00:01:54 -to 00:06:53</code>

Crop video

<code>-vf "crop=W:H:X:Y"</code>

  * W is the desired width of the output video
  * H is the desired height of the output video
  * X:Y are the output coordinates of the top left corner to start at on original video
  * Example: "crop=960:720:150:0" - would crop video with 150px bars to 4:3 ratio

Basic audio settings: 2 channel AAC at 128k

<code>-c:a aac -b:a 128k -ac 2</code>