diff --git a/Code/AudioVideo/FFmpegCommands.cs b/Code/AudioVideo/FFmpegCommands.cs
index f7db57d..ca783da 100644
--- a/Code/AudioVideo/FFmpegCommands.cs
+++ b/Code/AudioVideo/FFmpegCommands.cs
@@ -89,20 +89,6 @@ namespace Flowframes
                 DeleteSource(inputFile);
         }
 
-        public static async Task FramesToMp4Vfr(string framesFile, string outPath, Utils.Codec codec, int crf, float fps, AvProcess.LogMode logMode = AvProcess.LogMode.OnlyLastLine)
-        {
-            if(logMode != AvProcess.LogMode.Hidden)
-                Logger.Log($"Encoding MP4 video with CRF {crf}...");
-            string enc = Utils.GetEnc(codec);
-            string preset = $"-preset {Config.Get("ffEncPreset")}";
-            string vfrFilename = Path.GetFileName(framesFile);
-            string vsync = (Interpolate.current.interpFactor == 2) ? "-vsync 1" : "-vsync 2";
-            string rate = fps.ToString().Replace(",", ".");
-            string extraArgs = Config.Get("ffEncArgs");
-            string args = $"{vsync} -f concat -i {vfrFilename} -r {rate} -c:v {enc} -crf {crf} {preset} {extraArgs} {videoEncArgs} -threads {Config.GetInt("ffEncThreads")} -c:a copy {outPath.Wrap()}";
-            await AvProcess.RunFfmpeg(args, framesFile.GetParentDir(), logMode);
-        }
-
         public static async Task FramesToVideoVfr(string framesFile, string outPath, Interpolate.OutMode outMode, float fps, AvProcess.LogMode logMode = AvProcess.LogMode.OnlyLastLine)
         {
             if (logMode != AvProcess.LogMode.Hidden)
@@ -213,18 +199,6 @@ namespace Flowframes
                 File.Delete(outFile);
         }
 
-        static string GetAudioExt(string videoFile)
-        {
-            switch (GetAudioCodec(videoFile))
-            {
-                case "vorbis": return "ogg";
-                case "opus": return "ogg";
-                case "mp2": return "mp2";
-                case "aac": return "m4a";
-                default: return "wav";
-            }
-        }
-
         public static async Task MergeAudio(string inputFile, string audioPath, int looptimes = -1)    // https://superuser.com/a/277667
         {
             Logger.Log($"[FFCmds] Merging audio from {audioPath} into {inputFile}", true);
@@ -342,7 +316,7 @@ namespace Flowframes
             return -1;
         }
 
-        static string GetAudioCodec(string path)
+        public static string GetAudioCodec(string path)
         {
             string args = $" -v panic -show_streams -select_streams a -show_entries stream=codec_name {path.Wrap()}";
             string info = AvProcess.GetFfprobeOutput(args);
diff --git a/Code/AudioVideo/FFmpegUtils.cs b/Code/AudioVideo/FFmpegUtils.cs
index 838ab5e..69bdec9 100644
--- a/Code/AudioVideo/FFmpegUtils.cs
+++ b/Code/AudioVideo/FFmpegUtils.cs
@@ -109,5 +109,17 @@ namespace Flowframes.AudioVideo
 
             return ext;
         }
+
+        static string GetAudioExt(string videoFile)
+        {
+            switch (FFmpegCommands.GetAudioCodec(videoFile))
+            {
+                case "vorbis": return "ogg";
+                case "opus": return "ogg";
+                case "mp2": return "mp2";
+                case "aac": return "m4a";
+                default: return "wav";
+            }
+        }
     }
 }
diff --git a/Pkgs/av/ffmpeg.exe b/Pkgs/av/ffmpeg.exe
index f06cbf4..dfd0d45 100644
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diff --git a/Pkgs/av/ffprobe.exe b/Pkgs/av/ffprobe.exe
index 0ac2e75..fddea14 100644
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diff --git a/pkgs/av/swscale-5.dll b/pkgs/av/swscale-5.dll
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