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Snippets
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Change container
================

.. code:: shell

 ffmpeg \
 -i input.avi \
 -y output.mkv

Record video device
===================

List formats
------------

.. code:: shell

 ffmpeg \
 -f v4l2 -list_formats all \
 -i /dev/video0

Acquire fastly
--------------

.. code:: shell

 ffmpeg \
 -f v4l2 \
 -video_size 1920x1080 -framerate 60 \
 -input_format yuyv422 \
 -i /dev/video0 \
 -codec:v libx264 -preset ultrafast -qp 0 \
 -y ultrafast.mkv

.. code:: shell

 ffmpeg \
 -f v4l2 -use_wallclock_as_timestamps true \
 -video_size 1920x1080 -framerate 60 \
 -input_format bgr24 \
 -i /dev/video0 \
 -vf vflip \
 -codec:v libx264 -preset ultrafast -qp 0 \
 -y ultrafast.mkv

Windows desktop:

.. code:: shell

 -f 'gdigrab' -i 'desktop'

Cut and shrink
--------------

.. code:: shell

 ffmpeg -i ultrafast.mkv \
 -ss 00:00:01.000 -to 00:00:02.000 \
 -codec:v libx264 -preset veryslow -qp 0 \
 -y uf.mkv

Compress for web
----------------

.. code:: shell

 ffmpeg -i uf.mkv \
 -codec:v libx264 -preset veryslow -qp 23 \
 -movflags +faststart -pix_fmt yuv420p \
 -y uf.23.mp4

.. code:: shell

 ffmpeg -i uf.mkv \
 -codec:v libx265 -preset veryslow -qp 28 \
 -movflags +faststart -pix_fmt yuv420p \
 -y uf.28.mp4

Cut file
========

.. code:: shell

 ffmpeg \
 -i input.mkv \
 -ss 00:00:01.000 \
 -to 00:00:02.000 \
 -codec copy \
 -y output.mkv

Closest I frames
----------------

.. code:: shell

 ffmpeg \
 -ss 00:00:01.000 \
 -i input.mkv \
 -to 00:00:02.000 \
 -codec copy \
 -y output.mkv

Filter
======

* comma separated

Crop
----

.. code:: shell

 -filter:v "crop=1280:720:0:0"

Speed
-----

.. code:: shell

 -r 120 \
 -filter:v "setpts=0.5*PTS"

.. code:: shell

 -filter:a "atempo=2.0"