[FFmpeg-user] Ryujinx FFMpeg crash upon decoding h264

[Auron Hines]

When any game requests for h264 decoding, we use ffmpeg for this, however, AMD users seem to be getting an error upon decoding.

Ryujinx.NvdecProcessor Application : Unhandled exception caught: System.ArgumentNullException: Value cannot be null. (Parameter 'ptr')
   at System.Runtime.InteropServices.Marshal.GetDelegateForFunctionPointer(IntPtr ptr, Type t)
   at System.Runtime.InteropServices.Marshal.GetDelegateForFunctionPointer[TDelegate](IntPtr ptr)
   at Ryujinx.Graphics.Nvdec.FFmpeg.FFmpegContext..ctor(AVCodecID codecId)
   at Ryujinx.Graphics.Nvdec.FFmpeg.H264.Decoder..ctor()
   at Ryujinx.Graphics.Nvdec.NvdecDecoderContext.GetH264Decoder()
   at Ryujinx.Graphics.Nvdec.H264Decoder.Decode(NvdecDecoderContext context, ResourceManager rm, NvdecRegisters& state)
   at Ryujinx.Graphics.Nvdec.NvdecDevice.Decode(CodecId codecId)
   at Ryujinx.Common.AsyncWorkQueue`1.DoWork()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

Code with error: https://github.com/Ryujinx/Ryujinx/blob/master/Ryujinx.Graphics.Nvdec.FFmpeg/FFmpegContext.cs#L27
[https://opengraph.githubassets.com/fa03eb0f8870608392d3c7c7742748921a08c9159e27c3086c4f28a47c9a7c57/Ryujinx/Ryujinx]<https://github.com/Ryujinx/Ryujinx/blob/master/Ryujinx.Graphics.Nvdec.FFmpeg/FFmpegContext.cs#L27>
Ryujinx/FFmpegContext.cs at master · Ryujinx/Ryujinx<https://github.com/Ryujinx/Ryujinx/blob/master/Ryujinx.Graphics.Nvdec.FFmpeg/FFmpegContext.cs#L27>
Experimental Nintendo Switch Emulator written in C# - Ryujinx/FFmpegContext.cs at master · Ryujinx/Ryujinx
github.com
System info: https://pastebin.com/jYFBSt0F