Documentation improvements

README.md

@@ -1,7 +1,31 @@
-# FFmpegHDRMetadata
+# FFmpeg HDR Metadata Extractor
 
-**FFmpegHDRMetadata** is a HDR metadata extractor that uses **ffprobe** in order to retrive HDR metadata from file, and generates ffmpeg parameters based on it.
+**FFmpeg HDR Metadata Extractor** is a HDR metadata extractor that uses **ffprobe** in order to retrieve HDR metadata from file, and generates ffmpeg parameters based on it.
 Specifically it generates comman line parameter for tree codecs available in FFmpeg:
 - x265
 - libsvtav1
 - libaom_av1
+
+# Pre requirements
+In order to use this python script you need **python** version 3+ and **ffprobe** binary installed somewhere on your system.
+## Linux
+In **Linux** **ffprobe** usually came with **ffmpeg** package in your distribution.
+## Windows
+In **Windows**, you should search and install **ffmpeg** package by yourself, good starting point is ffmpeg official site: https://ffmpeg.org/download.html
+
+# Usage
+```
+get_hdr_metadata.py [-h] -i INPUT_FILE [-s INPUT_STREAM] [-e FFPROBE_BINARY]
+
+options:
+  -h, --help            show this help message and exit
+  -i INPUT_FILE, --input-file INPUT_FILE
+                        video file name from which hdr metadata needs to be extracted.
+  -s INPUT_STREAM, --input-stream INPUT_STREAM
+                        video stream number in the input file, default 0.
+  -e FFPROBE_BINARY, --ffprobe-binary FFPROBE_BINARY
+                        specify ffprobe binary to use, default - "ffprobe".
+```
+
+On Windows you probably need to specify exact ffprobe.exe binary location.
+For example: `python get_hdr_metadata.py -e "C:\ffmpeg\ffprobe.exe" -i test.mkv`