diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
index c0977e8af7..a31a735bed 100644
--- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
+++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
@@ -7495,8 +7495,7 @@ namespace MediaBrowser.Controller.MediaEncoding
                 {
                     // Progressive download - use faststart for proper seeking and duration
                     // Use frag_keyframe for better seeking compatibility with mpv
-                    // avoid_negative_ts make_zero ensures timestamps start at 0 for better player compatibility
-                    format = " -f mp4 -movflags frag_keyframe+faststart+default_base_moof -avoid_negative_ts make_zero";
+                    format = " -f mp4 -movflags frag_keyframe+faststart+default_base_moof";
                 }
             }
 
@@ -7603,6 +7602,12 @@ 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);