FFMPEG - Updates (#33)

* FFMPEG - Updates

* Readme - Updates

* Sample - Install

* Install Sample Deps

* Samples - Updates

* Sample - Added missing header

[ROCm/rocdecode commit: d34d85027c]

projects/rocdecode/samples/videoDecode/README.md

@@ -1,11 +1,36 @@
 # Video Decode Sample
-This sample illustrates the FFMPEG demuxer to get the individual frames which are then decoded on AMD hardware using VAAPI. This sample supports both YUV420 8-bit and 10-bit streams.
+This sample illustrates the FFMPEG demuxer to get the individual frames which are then decoded on AMD hardware using VAAPI.
 
-## Build and run the sample:
+This sample supports both YUV420 8-bit and 10-bit streams.
+
+## Prerequisites:
+
+* Linux distribution
+  + Ubuntu - `20.04` / `22.04`
+
+* [ROCm supported hardware](https://rocm.docs.amd.com/en/latest/release/gpu_os_support.html)
+
+* Install [ROCm 5.5 or later](https://rocmdocs.amd.com/en/latest/deploy/linux/installer/install.html) with `--usecase=graphics,rocm --no-32`
+
+* rocDecode
+
+* CMake `3.5` or later
+
+* [FFMPEG](https://ffmpeg.org/about.html)
+  ```
+  sudo apt install ffmpeg libavcodec-dev libavformat-dev libswscale-dev
+  ```
+
+## Build
 ```
 mkdir build
 cd build
-cmake ..
+cmake ../
 make -j
-./videodecode -i <input video file - required> -o <optional; output path to save decoded YUV frames> -d <GPU device ID, 0 for the first device, 1 for the second device, etc>
+```
+# Run 
+```
+./videodecode -i <input video file [required]> 
+              -o <output path to save decoded YUV frames [optional]> 
+              -d <GPU device ID - 0:device 0 / 1:device 1/ ... [optional - default:0]>
 ```