feat(docs): migrate from .md to .rst (#4129)

docs/libs/ffmpeg.rst

@@ -0,0 +1,40 @@
+==============
+FFmpeg support
+==============
+
+`FFmpeg <https://www.ffmpeg.org/>`__ A complete, cross-platform solution
+to record, convert and stream audio and video.
+
+Install FFmpeg
+--------------
+
+-  Download FFmpeg from `here <https://www.ffmpeg.org/download.html>`__
+-  ``./configure --disable-all --disable-autodetect --disable-podpages --disable-asm --enable-avcodec --enable-avformat --enable-decoders --enable-encoders --enable-demuxers --enable-parsers --enable-protocol='file' --enable-swscale --enable-zlib``
+-  ``make``
+-  ``sudo make install``
+
+Add FFmpeg to your project
+--------------------------
+
+-  Add library: ``FFmpeg`` (for GCC: ``-lavformat -lavcodec -lavutil -lswscale -lm -lz -lpthread``)
+
+Usage
+-----
+
+Enable :c:macro:`LV_USE_FFMPEG` in ``lv_conf.h``.
+
+See the examples below.
+
+Note that, the FFmpeg extension doesn’t use LVGL’s file system. You can
+simply pass the path to the image or video as usual on your operating
+system or platform.
+
+Example
+-------
+
+.. include:: ../examples/libs/ffmpeg/index.rst
+
+API
+---
+
+:ref:`lv_ffmpeg`