README - updates for samples (#98)

* update readme for samples

* readme clean up

* readme clean up

[ROCm/rocdecode commit: ad54bd5258]

projects/rocdecode/samples/videoDecode/README.md

@@ -1,7 +1,5 @@
 # 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 rocDecode library.
 
 ## Prerequisites:
 
@@ -33,4 +31,7 @@ make -j
 ./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]>
+              -z <force_zero_latency - Decoded frames will be flushed out for display immediately [optional]>
+              -sei <extract SEI messages [optional]>
+              -crop <crop rectangle for output (not used when using interopped decoded frame) [optional - default: 0,0,0,0]>
 ```