fix: unset qmin and qmax for vt (#11246)

Co-authored-by: Nyanmisaka <nst799610810@gmail.com>

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -1333,7 +1333,7 @@ namespace MediaBrowser.Controller.MediaEncoding
             return ".ts";
         }
 
-        public string GetVideoBitrateParam(EncodingJobInfo state, string videoCodec)
+        private string GetVideoBitrateParam(EncodingJobInfo state, string videoCodec)
         {
             if (state.OutputVideoBitrate is null)
             {
@@ -1402,7 +1402,7 @@ namespace MediaBrowser.Controller.MediaEncoding
             {
                 // The `maxrate` and `bufsize` options can potentially lead to performance regression
                 // and even encoder hangs, especially when the value is very high.
-                return FormattableString.Invariant($" -b:v {bitrate}");
+                return FormattableString.Invariant($" -b:v {bitrate} -qmin -1 -qmax -1");
             }
 
             return FormattableString.Invariant($" -b:v {bitrate} -maxrate {bitrate} -bufsize {bufsize}");