fix: mpeg-ts playback with multi-byte characters

CHANGELOG.md

@@ -4,6 +4,11 @@ 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 regression from `v26.6.0` that broke `MPEG-TS` channels on Windows when the channel name or the ffmpeg path contains non-english characters (like `Télévision`)
+  - Affected channels would connect but never send any data
+  - `MPEG-TS (Legacy)` and channel preview were not affected
+  - Custom MPEG-TS scripts can now use the `ETV_CHANNEL_NAME`, `ETV_HLS_URL` and `ETV_FFMPEG_PATH` environment variables, which are not affected by this issue; the `{{ ChannelName }}`, `{{ HlsUrl }}` and `{{ FFmpegPath }}` template variables continue to work but remain affected
 
 ## [26.7.1] - 2026-07-31
 ### Changed

ErsatzTV.Infrastructure/FFmpeg/MpegTsScriptService.cs

@@ -2,6 +2,7 @@ using System.Collections.Concurrent;
 using System.IO.Abstractions;
 using System.Runtime.InteropServices;
 using CliWrap;
+using CliWrap.Builders;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.FFmpeg;
@@ -50,6 +51,11 @@ public class MpegTsScriptService(
             scriptFolder = kvp.Key;
         }
 
+        // the values below are passed through the environment (which the OS delivers as utf-16)
+        // rather than templated into the script; cmd.exe decodes batch files using the console
+        // code page, and at 65001 it aborts entirely on any multi-byte character
+        string channelName = channel.Name.Replace("\"", string.Empty);
+
         if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
         {
             string scriptInput = Path.Combine(scriptFolder, script.WindowsScript);
@@ -64,7 +70,8 @@ public class MpegTsScriptService(
                 {
                     var fileName = $"{tempFilePool.GetNextTempFile(TempFileCategory.MpegTsScript)}.bat";
                     await File.WriteAllTextAsync(fileName, finalScript);
-                    return Cli.Wrap(fileName);
+                    return Cli.Wrap(fileName)
+                        .WithEnvironmentVariables(WithScriptVariables(hlsUrl, channelName, ffmpegPath));
                 }
             }
         }
@@ -82,7 +89,9 @@ public class MpegTsScriptService(
                 {
                     string fileName = tempFilePool.GetNextTempFile(TempFileCategory.MpegTsScript);
                     await File.WriteAllTextAsync(fileName, finalScript);
-                    return Cli.Wrap("bash").WithArguments([fileName]);
+                    return Cli.Wrap("bash")
+                        .WithArguments([fileName])
+                        .WithEnvironmentVariables(WithScriptVariables(hlsUrl, channelName, ffmpegPath));
                 }
             }
         }
@@ -90,6 +99,15 @@ public class MpegTsScriptService(
         return [];
     }
 
+    private static Action<EnvironmentVariablesBuilder> WithScriptVariables(
+        string hlsUrl,
+        string channelName,
+        string ffmpegPath) =>
+        builder => builder
+            .Set("ETV_HLS_URL", hlsUrl)
+            .Set("ETV_CHANNEL_NAME", channelName)
+            .Set("ETV_FFMPEG_PATH", ffmpegPath);
+
     private async Task<Option<string>> GetTemplatedScript(
         string fileName,
         string hlsUrl,

ErsatzTV/Resources/Scripts/MpegTs/run.bat

@@ -1,3 +1,3 @@
 @echo off
 
-"{{ FFmpegPath }}" -nostdin -threads 1 -hide_banner -loglevel error -nostats -fflags +genpts+discardcorrupt+igndts -readrate 1.0 -i "{{ HlsUrl }}" -map 0 -c copy -metadata service_provider="ErsatzTV" -metadata service_name="{{ ChannelName }}" -f mpegts pipe:1
+"%ETV_FFMPEG_PATH%" -nostdin -threads 1 -hide_banner -loglevel error -nostats -fflags +genpts+discardcorrupt+igndts -readrate 1.0 -i "%ETV_HLS_URL%" -map 0 -c copy -metadata service_provider="ErsatzTV" -metadata service_name="%ETV_CHANNEL_NAME%" -f mpegts pipe:1

ErsatzTV/Resources/Scripts/MpegTs/run.sh

@@ -1,3 +1,3 @@
 #! /bin/sh
 
-"{{ FFmpegPath }}" -nostdin -threads 1 -hide_banner -loglevel error -nostats -fflags +genpts+discardcorrupt+igndts -readrate 1.0 -i "{{ HlsUrl }}" -map 0 -c copy -metadata service_provider="ErsatzTV" -metadata service_name="{{ ChannelName }}" -f mpegts pipe:1
+"$ETV_FFMPEG_PATH" -nostdin -threads 1 -hide_banner -loglevel error -nostats -fflags +genpts+discardcorrupt+igndts -readrate 1.0 -i "$ETV_HLS_URL" -map 0 -c copy -metadata service_provider="ErsatzTV" -metadata service_name="$ETV_CHANNEL_NAME" -f mpegts pipe:1