Fix exceptions while scanning

Fixes these exceptions:
```
[2019-12-22 20:48:14.779 +01:00] [ERR] Error in WaitForExit
System.InvalidOperationException: No process is associated with this object.
   at System.Diagnostics.Process.EnsureState(State state)
   at System.Diagnostics.Process.EnsureState(State state)
   at System.Diagnostics.Process.GetWaitState()
   at System.Diagnostics.Process.WaitForExitCore(Int32 milliseconds)
   at System.Diagnostics.Process.WaitForExit(Int32 milliseconds)
   at Emby.Server.Implementations.Diagnostics.CommonProcess.WaitForExit(Int32 timeMs) in /home/pi/dev/jellyfin/Emby.Server.Implementations/Diagnostics/CommonProcess.cs:line 100
   at MediaBrowser.MediaEncoding.Encoder.MediaEncoder.StopProcess(ProcessWrapper process, Int32 waitTimeMs) in /home/pi/dev/jellyfin/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs:line 785
[2019-12-22 20:48:14.790 +01:00] [INF] Killing ffmpeg process
[2019-12-22 20:48:14.795 +01:00] [ERR] Error killing process
System.InvalidOperationException: No process is associated with this object.
   at System.Diagnostics.Process.EnsureState(State state)
   at System.Diagnostics.Process.EnsureState(State state)
   at System.Diagnostics.Process.Kill()
   at Emby.Server.Implementations.Diagnostics.CommonProcess.Kill() in /home/pi/dev/jellyfin/Emby.Server.Implementations/Diagnostics/CommonProcess.cs:line 95
   at MediaBrowser.MediaEncoding.Encoder.MediaEncoder.StopProcess(ProcessWrapper process, Int32 waitTimeMs) in /home/pi/dev/jellyfin/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs:line 799
[2019-12-22 20:48:14.808 +01:00] [ERR] Error in "ffprobe"
System.Text.Json.JsonException: The JSON value could not be converted to System.String. Path: $.streams[0].start_pts | LineNumber: 32 | BytePositionInLine: 26.
 ---> System.InvalidOperationException: Cannot get the value of a token type 'Number' as a string.
   at System.Text.Json.Utf8JsonReader.GetString()
   at System.Text.Json.Serialization.Converters.JsonConverterString.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options)
   at System.Text.Json.JsonPropertyInfoNotNullable`4.OnRead(JsonTokenType tokenType, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.JsonPropertyInfo.Read(JsonTokenType tokenType, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.JsonSerializer.HandleValue(JsonTokenType tokenType, JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& state)
   at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack)
   --- End of inner exception stack trace ---
   at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& readStack, Utf8JsonReader& reader, Exception ex)
   at System.Text.Json.JsonSerializer.ReadCore(JsonSerializerOptions options, Utf8JsonReader& reader, ReadStack& readStack)
   at System.Text.Json.JsonSerializer.ReadCore(JsonReaderState& readerState, Boolean isFinalBlock, ReadOnlySpan`1 buffer, JsonSerializerOptions options, ReadStack& readStack)
   at System.Text.Json.JsonSerializer.ReadAsync[TValue](Stream utf8Json, Type returnType, JsonSerializerOptions options, CancellationToken cancellationToken)
   at MediaBrowser.MediaEncoding.Encoder.MediaEncoder.GetMediaInfoInternal(String inputPath, String primaryPath, MediaProtocol protocol, Boolean extractChapters, String probeSizeArgument, Boolean isAudio, Nullable`1 videoType, Boolean forceEnableLogging, CancellationToken cancellationToken) in /home/pi/dev/jellyfin/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs:line 399
   at MediaBrowser.Providers.MediaInfo.FFProbeVideoInfo.ProbeVideo[T](T item, MetadataRefreshOptions options, CancellationToken cancellationToken) in /home/pi/dev/jellyfin/MediaBrowser.Providers/MediaInfo/FFProbeVideoInfo.cs:line 122
   at MediaBrowser.Providers.Manager.MetadataService`2.RunCustomProvider(ICustomMetadataProvider`1 provider, TItemType item, String logName, MetadataRefreshOptions options, RefreshResult refreshResult, CancellationToken cancellationToken) in /home/pi/dev/jellyfin/MediaBrowser.Providers/Manager/MetadataService.cs:line 815
```

1 files changed, 8 insertions, 317 deletions

diff --git a/MediaBrowser.MediaEncoding/Probing/InternalMediaInfoResult.cs b/MediaBrowser.MediaEncoding/Probing/InternalMediaInfoResult.cs
index cc9d27608..0e319c1a8 100644
--- a/MediaBrowser.MediaEncoding/Probing/InternalMediaInfoResult.cs
+++ b/MediaBrowser.MediaEncoding/Probing/InternalMediaInfoResult.cs
@@ -1,9 +1,10 @@
 using System.Collections.Generic;
+using System.Text.Json.Serialization;
 
 namespace MediaBrowser.MediaEncoding.Probing
 {
     /// <summary>
-    /// Class MediaInfoResult
+    /// Class MediaInfoResult.
     /// </summary>
     public class InternalMediaInfoResult
     {
@@ -11,331 +12,21 @@ namespace MediaBrowser.MediaEncoding.Probing
         /// Gets or sets the streams.
         /// </summary>
         /// <value>The streams.</value>
-        public MediaStreamInfo[] streams { get; set; }
+        [JsonPropertyName("streams")]
+        public IReadOnlyList<MediaStreamInfo> Streams { get; set; }
 
         /// <summary>
         /// Gets or sets the format.
         /// </summary>
         /// <value>The format.</value>
-        public MediaFormatInfo format { get; set; }
+        [JsonPropertyName("format")]
+        public MediaFormatInfo Format { get; set; }
 
         /// <summary>
         /// Gets or sets the chapters.
         /// </summary>
         /// <value>The chapters.</value>
-        public MediaChapter[] Chapters { get; set; }
-    }
-
-    public class MediaChapter
-    {
-        public int id { get; set; }
-        public string time_base { get; set; }
-        public long start { get; set; }
-        public string start_time { get; set; }
-        public long end { get; set; }
-        public string end_time { get; set; }
-        public Dictionary<string, string> tags { get; set; }
-    }
-
-    /// <summary>
-    /// Represents a stream within the output
-    /// </summary>
-    public class MediaStreamInfo
-    {
-        /// <summary>
-        /// Gets or sets the index.
-        /// </summary>
-        /// <value>The index.</value>
-        public int index { get; set; }
-
-        /// <summary>
-        /// Gets or sets the profile.
-        /// </summary>
-        /// <value>The profile.</value>
-        public string profile { get; set; }
-
-        /// <summary>
-        /// Gets or sets the codec_name.
-        /// </summary>
-        /// <value>The codec_name.</value>
-        public string codec_name { get; set; }
-
-        /// <summary>
-        /// Gets or sets the codec_long_name.
-        /// </summary>
-        /// <value>The codec_long_name.</value>
-        public string codec_long_name { get; set; }
-
-        /// <summary>
-        /// Gets or sets the codec_type.
-        /// </summary>
-        /// <value>The codec_type.</value>
-        public string codec_type { get; set; }
-
-        /// <summary>
-        /// Gets or sets the sample_rate.
-        /// </summary>
-        /// <value>The sample_rate.</value>
-        public string sample_rate { get; set; }
-
-        /// <summary>
-        /// Gets or sets the channels.
-        /// </summary>
-        /// <value>The channels.</value>
-        public int channels { get; set; }
-
-        /// <summary>
-        /// Gets or sets the channel_layout.
-        /// </summary>
-        /// <value>The channel_layout.</value>
-        public string channel_layout { get; set; }
-
-        /// <summary>
-        /// Gets or sets the avg_frame_rate.
-        /// </summary>
-        /// <value>The avg_frame_rate.</value>
-        public string avg_frame_rate { get; set; }
-
-        /// <summary>
-        /// Gets or sets the duration.
-        /// </summary>
-        /// <value>The duration.</value>
-        public string duration { get; set; }
-
-        /// <summary>
-        /// Gets or sets the bit_rate.
-        /// </summary>
-        /// <value>The bit_rate.</value>
-        public string bit_rate { get; set; }
-
-        /// <summary>
-        /// Gets or sets the width.
-        /// </summary>
-        /// <value>The width.</value>
-        public int width { get; set; }
-
-        /// <summary>
-        /// Gets or sets the refs.
-        /// </summary>
-        /// <value>The refs.</value>
-        public int refs { get; set; }
-
-        /// <summary>
-        /// Gets or sets the height.
-        /// </summary>
-        /// <value>The height.</value>
-        public int height { get; set; }
-
-        /// <summary>
-        /// Gets or sets the display_aspect_ratio.
-        /// </summary>
-        /// <value>The display_aspect_ratio.</value>
-        public string display_aspect_ratio { get; set; }
-
-        /// <summary>
-        /// Gets or sets the tags.
-        /// </summary>
-        /// <value>The tags.</value>
-        public Dictionary<string, string> tags { get; set; }
-
-        /// <summary>
-        /// Gets or sets the bits_per_sample.
-        /// </summary>
-        /// <value>The bits_per_sample.</value>
-        public int bits_per_sample { get; set; }
-
-        /// <summary>
-        /// Gets or sets the bits_per_raw_sample.
-        /// </summary>
-        /// <value>The bits_per_raw_sample.</value>
-        public int bits_per_raw_sample { get; set; }
-
-        /// <summary>
-        /// Gets or sets the r_frame_rate.
-        /// </summary>
-        /// <value>The r_frame_rate.</value>
-        public string r_frame_rate { get; set; }
-
-        /// <summary>
-        /// Gets or sets the has_b_frames.
-        /// </summary>
-        /// <value>The has_b_frames.</value>
-        public int has_b_frames { get; set; }
-
-        /// <summary>
-        /// Gets or sets the sample_aspect_ratio.
-        /// </summary>
-        /// <value>The sample_aspect_ratio.</value>
-        public string sample_aspect_ratio { get; set; }
-
-        /// <summary>
-        /// Gets or sets the pix_fmt.
-        /// </summary>
-        /// <value>The pix_fmt.</value>
-        public string pix_fmt { get; set; }
-
-        /// <summary>
-        /// Gets or sets the level.
-        /// </summary>
-        /// <value>The level.</value>
-        public int level { get; set; }
-
-        /// <summary>
-        /// Gets or sets the time_base.
-        /// </summary>
-        /// <value>The time_base.</value>
-        public string time_base { get; set; }
-
-        /// <summary>
-        /// Gets or sets the start_time.
-        /// </summary>
-        /// <value>The start_time.</value>
-        public string start_time { get; set; }
-
-        /// <summary>
-        /// Gets or sets the codec_time_base.
-        /// </summary>
-        /// <value>The codec_time_base.</value>
-        public string codec_time_base { get; set; }
-
-        /// <summary>
-        /// Gets or sets the codec_tag.
-        /// </summary>
-        /// <value>The codec_tag.</value>
-        public string codec_tag { get; set; }
-
-        /// <summary>
-        /// Gets or sets the codec_tag_string.
-        /// </summary>
-        /// <value>The codec_tag_string.</value>
-        public string codec_tag_string { get; set; }
-
-        /// <summary>
-        /// Gets or sets the sample_fmt.
-        /// </summary>
-        /// <value>The sample_fmt.</value>
-        public string sample_fmt { get; set; }
-
-        /// <summary>
-        /// Gets or sets the dmix_mode.
-        /// </summary>
-        /// <value>The dmix_mode.</value>
-        public string dmix_mode { get; set; }
-
-        /// <summary>
-        /// Gets or sets the start_pts.
-        /// </summary>
-        /// <value>The start_pts.</value>
-        public string start_pts { get; set; }
-
-        /// <summary>
-        /// Gets or sets the is_avc.
-        /// </summary>
-        /// <value>The is_avc.</value>
-        public string is_avc { get; set; }
-
-        /// <summary>
-        /// Gets or sets the nal_length_size.
-        /// </summary>
-        /// <value>The nal_length_size.</value>
-        public string nal_length_size { get; set; }
-
-        /// <summary>
-        /// Gets or sets the ltrt_cmixlev.
-        /// </summary>
-        /// <value>The ltrt_cmixlev.</value>
-        public string ltrt_cmixlev { get; set; }
-
-        /// <summary>
-        /// Gets or sets the ltrt_surmixlev.
-        /// </summary>
-        /// <value>The ltrt_surmixlev.</value>
-        public string ltrt_surmixlev { get; set; }
-
-        /// <summary>
-        /// Gets or sets the loro_cmixlev.
-        /// </summary>
-        /// <value>The loro_cmixlev.</value>
-        public string loro_cmixlev { get; set; }
-
-        /// <summary>
-        /// Gets or sets the loro_surmixlev.
-        /// </summary>
-        /// <value>The loro_surmixlev.</value>
-        public string loro_surmixlev { get; set; }
-
-        public string field_order { get; set; }
-
-        /// <summary>
-        /// Gets or sets the disposition.
-        /// </summary>
-        /// <value>The disposition.</value>
-        public Dictionary<string, string> disposition { get; set; }
-    }
-
-    /// <summary>
-    /// Class MediaFormat
-    /// </summary>
-    public class MediaFormatInfo
-    {
-        /// <summary>
-        /// Gets or sets the filename.
-        /// </summary>
-        /// <value>The filename.</value>
-        public string filename { get; set; }
-
-        /// <summary>
-        /// Gets or sets the nb_streams.
-        /// </summary>
-        /// <value>The nb_streams.</value>
-        public int nb_streams { get; set; }
-
-        /// <summary>
-        /// Gets or sets the format_name.
-        /// </summary>
-        /// <value>The format_name.</value>
-        public string format_name { get; set; }
-
-        /// <summary>
-        /// Gets or sets the format_long_name.
-        /// </summary>
-        /// <value>The format_long_name.</value>
-        public string format_long_name { get; set; }
-
-        /// <summary>
-        /// Gets or sets the start_time.
-        /// </summary>
-        /// <value>The start_time.</value>
-        public string start_time { get; set; }
-
-        /// <summary>
-        /// Gets or sets the duration.
-        /// </summary>
-        /// <value>The duration.</value>
-        public string duration { get; set; }
-
-        /// <summary>
-        /// Gets or sets the size.
-        /// </summary>
-        /// <value>The size.</value>
-        public string size { get; set; }
-
-        /// <summary>
-        /// Gets or sets the bit_rate.
-        /// </summary>
-        /// <value>The bit_rate.</value>
-        public string bit_rate { get; set; }
-
-        /// <summary>
-        /// Gets or sets the probe_score.
-        /// </summary>
-        /// <value>The probe_score.</value>
-        public int probe_score { get; set; }
-
-        /// <summary>
-        /// Gets or sets the tags.
-        /// </summary>
-        /// <value>The tags.</value>
-        public Dictionary<string, string> tags { get; set; }
+        [JsonPropertyName("chapters")]
+        public IReadOnlyList<MediaChapter> Chapters { get; set; }
     }
 }