diff --git a/TwitchDownloaderCore/Tools/FfmpegConcatList.cs b/TwitchDownloaderCore/Tools/FfmpegConcatList.cs
index 374c6dea..c3ea6c5b 100644
--- a/TwitchDownloaderCore/Tools/FfmpegConcatList.cs
+++ b/TwitchDownloaderCore/Tools/FfmpegConcatList.cs
@@ -24,7 +24,7 @@ public static async Task SerializeAsync(string filePath, M3U8 playlist, Range vi
                 cancellationToken.ThrowIfCancellationRequested();
 
                 await sw.WriteAsync("file '");
-                await sw.WriteAsync(stream.Path);
+                await sw.WriteAsync(DownloadTools.RemoveQueryString(stream.Path));
                 await sw.WriteLineAsync('\'');
 
                 await sw.WriteAsync("duration ");
diff --git a/TwitchDownloaderCore/VideoDownloader.cs b/TwitchDownloaderCore/VideoDownloader.cs
index acc733db..fbb92d7d 100644
--- a/TwitchDownloaderCore/VideoDownloader.cs
+++ b/TwitchDownloaderCore/VideoDownloader.cs
@@ -415,6 +415,7 @@ private int RunFfmpegVideoCopy(string tempFolder, FileInfo outputFile, string co
             process.BeginErrorReadLine();
 
             using var logWriter = File.AppendText(Path.Combine(tempFolder, "ffmpegLog.txt"));
+            logWriter.AutoFlush = true;
             do // We cannot handle logging inside the ErrorDataReceived lambda because more than 1 can come in at once and cause a race condition. lay295#598
             {
                 Thread.Sleep(100);