Reworked FFmpeg path discovery and always display to user

1) Reworked FFmpeg and FFprobe path discovery (CLI switch, Custom xml, system $PATH, UI update trigger).  Removed FFMpeg folder from Emby.Server.Implementations.  All path discovery now in MediaEncoder.

2) Always display FFmpeg path to user in Transcode page.

3) Allow user to remove a Custome FFmpeg path and return to using system $PATH (or --ffmpeg if available).

4) Remove unused code associated with 'prebuilt' FFmpeg.

5) Much improved logging during path discovery.

1 files changed, 1 insertions, 1 deletions

diff --git a/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs b/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs
index f725d2c01..1eeea87a0 100644
--- a/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs
+++ b/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs
@@ -19,7 +19,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
             _processFactory = processFactory;
         }
 
-        public (IEnumerable<string> decoders, IEnumerable<string> encoders) Validate(string encoderPath)
+        public (IEnumerable<string> decoders, IEnumerable<string> encoders) GetAvailableCoders(string encoderPath)
         {
             _logger.LogInformation("Validating media encoder at {EncoderPath}", encoderPath);