Samples - Docs Updated (#204)

[ROCm/rocdecode commit: 2298d93990]

projects/rocdecode/samples/videoDecodeRGB/README.md

@@ -1,11 +1,36 @@
-# Video Decode Sample
-This sample illustrates the FFMPEG demuxer to get the individual frames which are then decoded using rocDecode API and optionally color-converted using custom HIP kernels on AMD hardware. This sample converts decoded YUV output to one of the RGB or BGR formats(24bit, 32bit, 464bit)
+# Video decode RGB sample
 
-## Build and run the sample:
-```
-mkdir build
-cd build
-cmake ..
+This sample illustrates the FFMPEG demuxer to get the individual frames which are then decoded using rocDecode API and optionally color-converted using custom HIP kernels on AMD hardware. This sample converts decoded YUV output to one of the RGB or BGR formats(24bit, 32bit, 464bit) in a separate thread allowing to run both VCN hardware and compute engine in parallel.
+
+This sample uses HIP kernels to showcase the color conversion.  Whenever a frame is ready after decoding, the `ColorSpaceConversionThread` is notified and can be used for post-processing.
+
+## Prerequisites:
+
+* Install [rocDecode](../../README.md#build-and-install-instructions)
+
+* [FFMPEG](https://ffmpeg.org/about.html)
+
+    * On `Ubuntu`
+
+  ```shell
+  sudo apt install ffmpeg libavcodec-dev libavformat-dev libavutil-dev
+  ```
+  
+    * On `RHEL`/`SLES` - install ffmpeg development packages manually or use [rocDecode-setup.py](../../rocDecode-setup.py) script
+
+## Build
+
+```shell
+mkdir video_decode_rgb_sample && cd video_decode_rgb_sample
+cmake ../
 make -j
-./videodecodergb -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> -of <optional: output format bgr, bgra, bgr48, bgr64 etc>
+```
+
+## Run
+
+```shell
+./videodecodergb    -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> 
+                    -of <optional: output format bgr, bgra, bgr48, bgr64 etc>
 ```