Samples - Docs Updated (#204)

[ROCm/rocdecode commit: 2298d93990]

projects/rocdecode/samples/videoDecodePerf/README.md

@@ -1,35 +1,34 @@
-# Video Decode Sample
+# Video decode performance sample
+
 This sample illustrates the FFMPEG demuxer to get the individual frames which are then decoded on AMD hardware using rocDecode library.
 
 This sample uses multiple threads to decode the same input video parallely.
 
 ## 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
+* 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
   ```
-  sudo apt install ffmpeg
-  ```
+  
+    * On `RHEL`/`SLES` - install ffmpeg development packages manually or use [rocDecode-setup.py](../../rocDecode-setup.py) script
 
 ## Build
-```
-mkdir build
-cd build
+
+```shell
+mkdir video_decode_perf_sample && cd video_decode_perf_sample
 cmake ../
 make -j
 ```
-# Run 
-```
+
+## Run
+
+```shell
 ./videodecodeperf -i <input video file [required]> 
                   -t <number of threads [optional - default:4]>
                   -d <Device ID (>= 0) [optional - default:0]>