diff --git a/testdata/src/test/assets/muxerdumps/ftyp_box_added_new_compatible_brand.dump b/testdata/src/test/assets/muxerdumps/ftyp_box_added_new_compatible_brand.dump
new file mode 100644
index 0000000000..8b52cdf370
--- /dev/null
+++ b/testdata/src/test/assets/muxerdumps/ftyp_box_added_new_compatible_brand.dump
@@ -0,0 +1,4 @@
+ftyp (32 bytes):
+  Data = length 24, hash 87F07F95
+free (32 bytes):
+  Data = length 24, hash 84304D01
diff --git a/testdata/src/test/assets/muxerdumps/ftyp_box_changed_main_brand.dump b/testdata/src/test/assets/muxerdumps/ftyp_box_changed_main_brand.dump
new file mode 100644
index 0000000000..f4e919d847
--- /dev/null
+++ b/testdata/src/test/assets/muxerdumps/ftyp_box_changed_main_brand.dump
@@ -0,0 +1,4 @@
+ftyp (28 bytes):
+  Data = length 20, hash 44CF0210
+free (36 bytes):
+  Data = length 28, hash 294FE481