Improving HW-ACCEL documentation

Author: jonoomph

doc/HW-ACCEL.md

@@ -7,23 +7,24 @@ our support for this in the future!
 
 The following table summarizes our current level of support:
 
-|                    | Linux Decode | Linux Encode | Mac Decode | Mac Encode | Windows Decode       | Windows Encode | Notes          |
-|--------------------|--------------|--------------|------------|------------|----------------------|----------------|----------------|
-| VA-API             |   Verified   |   Verified   |      -     |      -     |           -          |        -       | Linux Only     |
-| VDPAU              |  Verified(+) |   N/A(++)    |      -     |      -     |           -          |        -       | Linux Only     |
-| CUDA (NVDEC/NVENC) |  Fails(+++)  |   Verified   |      -     |      -     |           -          |    Verified    | Cross Platform |
-| VideoToolBox       |       -      |       -      |  Verified  |   Crashes  |           -          |        -       | Mac Only       |
-| DXVA2              |       -      |       -      |      -     |      -     | Fails (green frames) |    Verified    | Windows Only   |
-| D3D11VA            |       -      |       -      |      -     |      -     | Fails (green frames) |        -       | Windows Only   |
-| QSV                |     Fails    |     Fails    |    Fails   |    Fails   |         Fails        |      Fails     | Cross Platform |
+|                    | Linux Decode | Linux Encode | Mac Decode | Mac Encode | Windows Decode | Windows Encode | Notes          |
+|--------------------|--------------|--------------|------------|------------|----------------|----------------|----------------|
+| VA-API             |   Verified   |   Verified   |      -     |      -     |        -       |        -       | Linux Only     |
+| VDPAU              |  Verified(+) |    N/A(++)   |      -     |      -     |        -       |        -       | Linux Only     |
+| CUDA (NVDEC/NVENC) |  Fails(+++)  |   Verified   |      -     |      -     |        -       |    Verified    | Cross Platform |
+| VideoToolBox       |       -      |       -      |  Verified  |   Crashes  |        -       |        -       | Mac Only       |
+| DXVA2              |       -      |       -      |      -     |      -     |   Fails(+++)   |        -       | Windows Only   |
+| D3D11VA            |       -      |       -      |      -     |      -     |   Fails(+++)   |        -       | Windows Only   |
+| QSV                |     Fails    |     Fails    |    Fails   |    Fails   |      Fails     |      Fails     | Cross Platform |
+
+* *(+) VDPAU for some reason needs a card number one higher than it really is*
+* *(++) VDPAU is a decoder only.*
+* *(+++) Green frames (pixel data not correctly tranferred back to system memory)*
 
 ## Supported FFmpeg Versions
 
 * HW accel is supported from FFmpeg version 3.2 (3.3 for nVidia drivers)
 * HW accel was removed for nVidia drivers in Ubuntu for FFmpeg 4+
-* (+) VDPAU for some reason needs a card number one higher than it really is
-* (++) VDPAU is a decoder only.
-* (+++) Green frames
 
 **Notice:** The FFmpeg versions of Ubuntu and PPAs for Ubuntu show the
 same behaviour. FFmpeg 3 has working nVidia hardware acceleration while