force SAR 1:1 if missing (#136)

ErsatzTV.Core/Metadata/LocalStatisticsProvider.cs

@@ -164,7 +164,9 @@ namespace ErsatzTV.Core.Metadata
                         FFprobeStream videoStream = json.streams.FirstOrDefault(s => s.codec_type == "video");
                         if (videoStream != null)
                         {
-                            version.SampleAspectRatio = videoStream.sample_aspect_ratio;
+                            version.SampleAspectRatio = string.IsNullOrWhiteSpace(videoStream.sample_aspect_ratio)
+                                ? "1:1"
+                                : videoStream.sample_aspect_ratio;
                             version.DisplayAspectRatio = videoStream.display_aspect_ratio;
                             version.Width = videoStream.width;
                             version.Height = videoStream.height;

ErsatzTV.Infrastructure/Migrations/20210404225739_Update_MediaVersion_SampleAspectRatio11.cs

@@ -0,0 +1,14 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Update_MediaVersion_SampleAspectRatio11 : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder) => migrationBuilder.Sql(
+            @"UPDATE MediaVersion SET SampleAspectRatio = '1:1' where SampleAspectRatio is null");
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+        }
+    }
+}