fix generated streams with mpeg2video (#444)

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
+### Fixed
+- Fix generated streams with mpeg2video
 
 ## [0.1.5-alpha] - 2021-10-18
 ### Fixed

ErsatzTV.Core/FFmpeg/FFmpegProcessBuilder.cs

@@ -375,7 +375,8 @@ namespace ErsatzTV.Core.FFmpeg
             {
                 "-c:v", playbackSettings.VideoCodec,
                 "-flags", "cgop",
-                "-sc_threshold", "0" // disable scene change detection
+                // disable scene change detection except with mpeg2video
+                "-sc_threshold", playbackSettings.VideoCodec == "mpeg2video" ? "1000000000" : "0"
             };
 
             if (!string.IsNullOrWhiteSpace(_outputPixelFormat))