diff --git a/src/lottie/rapidjson/stream.h b/src/lottie/rapidjson/stream.h
index 7f2643e481..c08a87e183 100644
--- a/src/lottie/rapidjson/stream.h
+++ b/src/lottie/rapidjson/stream.h
@@ -188,7 +188,9 @@ template <typename Encoding>
 struct GenericInsituStringStream {
     typedef typename Encoding::Ch Ch;
 
-    GenericInsituStringStream(Ch *src) : src_(src), dst_(0), head_(src) {}
+    GenericInsituStringStream(Ch *src) : src_(src), dst_(0), head_(src) {
+        SkipBOM();
+    }
 
     // Read
     Ch Peek() { return *src_; }
@@ -205,6 +207,31 @@ struct GenericInsituStringStream {
     Ch* Push(size_t count) { Ch* begin = dst_; dst_ += count; return begin; }
     void Pop(size_t count) { dst_ -= count; }
 
+    /*
+       Detect encoding type with BOM or RFC 4627
+       BOM (Byte Order Mark):
+       00 00 FE FF  UTF-32BE
+       FF FE 00 00  UTF-32LE
+       FE FF        UTF-16BE
+       FF FE        UTF-16LE
+       EF BB BF     UTF-8
+     */
+    void SkipBOM() {
+
+        unsigned char *c = reinterpret_cast<unsigned char *>(src_);
+        if (!c) return;
+
+        unsigned bom = (c[0] | (c[1] << 8) | (c[2] << 16) | (c[3] << 24));
+
+        if (bom == 0xFFFE0000)                  { Take(); Take(); Take(); Take(); }
+        else if (bom == 0x0000FEFF)             { Take(); Take(); Take(); Take(); }
+        else if ((bom & 0xFFFF) == 0xFFFE)      { Take(); Take(); }
+        else if ((bom & 0xFFFF) == 0xFEFF)      { Take(); Take(); }
+        else if ((bom & 0xFFFFFF) == 0xBFBBEF)  { Take(); Take(); Take(); }
+
+        //It might need to clarify this file is a type of RFC 4627?
+    }
+
     Ch* src_;
     Ch* dst_;
     Ch* head_;