diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
index a31a735bed..99305f8b14 100644
--- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
+++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
@@ -7503,9 +7503,18 @@ namespace MediaBrowser.Controller.MediaEncoding
 
             var inputModifier = GetInputModifier(state, encodingOptions, null);
 
+            // Add timestamp normalization for progressive downloads
+            var timestampArgs = string.Empty;
+            if (state.TranscodingType == TranscodingJobType.Progressive && !state.BaseRequest.CopyTimestamps)
+            {
+                // For progressive downloads without copyTimestamps, ensure timestamps start at 0
+                // This fixes seeking issues in strict players like mpv, iina, and infuse
+                timestampArgs = " -avoid_negative_ts make_zero -start_at_zero";
+            }
+
             return string.Format(
                 CultureInfo.InvariantCulture,
-                "{0} {1}{2} {3} {4} -map_metadata -1 -map_chapters -1 -threads {5} {6}{7}{8} -y \"{9}\"",
+                "{0} {1}{2} {3} {4} -map_metadata -1 -map_chapters -1 -threads {5} {6}{7}{8}{9} -y \"{10}\"",
                 inputModifier,
                 GetInputArgument(state, encodingOptions, null),
                 keyFrame,
@@ -7514,6 +7523,7 @@ namespace MediaBrowser.Controller.MediaEncoding
                 threads,
                 GetProgressiveVideoAudioArguments(state, encodingOptions),
                 GetSubtitleEmbedArguments(state),
+                timestampArgs,
                 format,
                 outputPath).Trim();
         }
@@ -7602,13 +7612,6 @@ namespace MediaBrowser.Controller.MediaEncoding
                         args += " -start_at_zero";
                     }
                 }
-                else if (state.TranscodingType == TranscodingJobType.Progressive && !state.BaseRequest.CopyTimestamps)
-                {
-                    // For progressive downloads without copyTimestamps, ensure timestamps start at 0
-                    // This fixes seeking issues in strict players like mpv, iina, and infuse
-                    args += " -avoid_negative_ts make_zero -start_at_zero";
-                }
-
                 var qualityParam = GetVideoQualityParam(state, videoCodec, encodingOptions, defaultPreset);
 
                 if (!string.IsNullOrEmpty(qualityParam))