diff --git a/lib/membrane_mp4/container/parse_helper.ex b/lib/membrane_mp4/container/parse_helper.ex
index 5c32a35..5a3c264 100644
--- a/lib/membrane_mp4/container/parse_helper.ex
+++ b/lib/membrane_mp4/container/parse_helper.ex
@@ -63,10 +63,10 @@ defmodule Membrane.MP4.Container.ParseHelper do
   end
 
   defp parse_field(data, {name, {type, store: context_name, when: condition}}, context) do
-    {flag, key} = condition
+    {flag_value, key, mask} = condition
     context_object = Map.get(context, key, 0)
 
-    if (flag &&& context_object) == flag do
+    if (mask &&& context_object) == flag_value do
       parse_field(data, {name, {type, store: context_name}}, context)
     else
       {:ok, {[], data}, context}
@@ -81,10 +81,11 @@ defmodule Membrane.MP4.Container.ParseHelper do
   end
 
   defp parse_field(data, {name, {type, when: condition}}, context) do
-    {flag, key} = condition
+    {flag_value, key, mask} = condition
+
     context_object = Map.get(context, key, 0)
 
-    if (flag &&& context_object) == flag do
+    if (mask &&& context_object) == flag_value do
       parse_field(data, {name, type}, context)
     else
       {:ok, {[], data}, context}
diff --git a/lib/membrane_mp4/container/schema.ex b/lib/membrane_mp4/container/schema.ex
index d0483d4..1ad7e53 100644
--- a/lib/membrane_mp4/container/schema.ex
+++ b/lib/membrane_mp4/container/schema.ex
@@ -10,7 +10,7 @@ defmodule Membrane.MP4.Container.Schema do
   """
 
   @full_box [
-    version: :uint8,
+    version: {:uint8, store: :version},
     flags: {:uint24, store: :fo_flags}
   ]
 
@@ -70,10 +70,13 @@ defmodule Membrane.MP4.Container.Schema do
                   fields:
                     @full_box ++
                       [
-                        creation_time: :uint32,
-                        modification_time: :uint32,
+                        creation_time: {:uint32, when: {0, :version}},
+                        creation_time: {:uint64, when: {1, :version}},
+                        modification_time: {:uint32, when: {0, :version}},
+                        modification_time: {:uint64, when: {1, :version}},
                         timescale: :uint32,
-                        duration: :uint32,
+                        duration: {:uint32, when: {0, :version}},
+                        duration: {:uint64, when: {1, :version}},
                         rate: :fp16d16,
                         volume: :fp8d8,
                         reserved: <<0::size(80)>>,
@@ -101,11 +104,14 @@ defmodule Membrane.MP4.Container.Schema do
                     fields:
                       @full_box ++
                         [
-                          creation_time: :uint32,
-                          modification_time: :uint32,
+                          creation_time: {:uint32, when: {0, :version}},
+                          creation_time: {:uint64, when: {1, :version}},
+                          modification_time: {:uint32, when: {0, :version}},
+                          modification_time: {:uint64, when: {1, :version}},
                           track_id: :uint32,
                           reserved: <<0::32>>,
-                          duration: :uint32,
+                          duration: {:uint32, when: {0, :version}},
+                          duration: {:uint64, when: {1, :version}},
                           reserved: <<0::64>>,
                           layer: :int16,
                           alternate_group: :int16,
@@ -130,10 +136,13 @@ defmodule Membrane.MP4.Container.Schema do
                       fields:
                         @full_box ++
                           [
-                            creation_time: :uint32,
-                            modification_time: :uint32,
+                            creation_time: {:uint32, when: {0, :version}},
+                            creation_time: {:uint64, when: {1, :version}},
+                            modification_time: {:uint32, when: {0, :version}},
+                            modification_time: {:uint64, when: {1, :version}},
                             timescale: :uint32,
-                            duration: :uint32,
+                            duration: {:uint32, when: {0, :version}},
+                            duration: {:uint64, when: {1, :version}},
                             reserved: <<0::1>>,
                             language: :uint15,
                             reserved: <<0::16>>
@@ -325,6 +334,19 @@ defmodule Membrane.MP4.Container.Schema do
                                      chunk_offset: :uint32
                                    ]}
                               ]
+                        ],
+                        co64: [
+                          version: 0,
+                          fields:
+                            @full_box ++
+                              [
+                                entry_count: :uint32,
+                                entry_list:
+                                  {:list,
+                                   [
+                                     chunk_offset: :uint64
+                                   ]}
+                              ]
                         ]
                       ]
                     ]
@@ -426,7 +448,7 @@ defmodule Membrane.MP4.Container.Schema do
                                sample_duration: :uint32,
                                sample_size: :uint32,
                                sample_flags: :bin32,
-                               sample_offset: {:uint32, when: {0x800, :fo_flags}}
+                               sample_offset: {:uint32, when: {0x800, :fo_flags, 0x800}}
                              ]}
                         ]
                   ]
diff --git a/lib/membrane_mp4/container/schema_parser.ex b/lib/membrane_mp4/container/schema_parser.ex
index a3410af..75450e4 100644
--- a/lib/membrane_mp4/container/schema_parser.ex
+++ b/lib/membrane_mp4/container/schema_parser.ex
@@ -62,10 +62,18 @@ defmodule Membrane.MP4.Container.Schema.Parser do
     {name, type}
   end
 
+  defp parse_field({name, {type, store: context_name, when: {flag, context_name, mask}}})
+       when is_atom(name) do
+    {name, type} = parse_field({name, type})
+    type = {type, store: context_name, when: {flag, context_name, mask}}
+    {name, type}
+  end
+
   defp parse_field({name, {type, store: context_name, when: {flag, context_name}}})
        when is_atom(name) do
     {name, type} = parse_field({name, type})
-    type = {type, store: context_name, when: {flag, context_name}}
+    default_mask = 0xFFFF_FFFF_FFFF_FFFF
+    type = {type, store: context_name, when: {flag, context_name, default_mask}}
     {name, type}
   end
 
@@ -75,9 +83,16 @@ defmodule Membrane.MP4.Container.Schema.Parser do
     {name, type}
   end
 
+  defp parse_field({name, {type, when: {flag, context_name, mask}}}) when is_atom(name) do
+    {name, type} = parse_field({name, type})
+    type = {type, when: {flag, context_name, mask}}
+    {name, type}
+  end
+
   defp parse_field({name, {type, when: {flag, context_name}}}) when is_atom(name) do
     {name, type} = parse_field({name, type})
-    type = {type, when: {flag, context_name}}
+    default_mask = 0xFFFF_FFFF_FFFF_FFFF
+    type = {type, when: {flag, context_name, default_mask}}
     {name, type}
   end
 
diff --git a/lib/membrane_mp4/container/serialize_helper.ex b/lib/membrane_mp4/container/serialize_helper.ex
index bd75899..d9647ac 100644
--- a/lib/membrane_mp4/container/serialize_helper.ex
+++ b/lib/membrane_mp4/container/serialize_helper.ex
@@ -65,10 +65,10 @@ defmodule Membrane.MP4.Container.SerializeHelper do
   end
 
   defp serialize_field(term, {type, store: context_name, when: condition}, context) do
-    {flag, key} = condition
+    {flag_value, key, mask} = condition
     context_object = Map.get(context, key)
 
-    if context_object != nil and (flag &&& context_object) == flag do
+    if context_object != nil and (mask &&& context_object) == flag_value do
       serialize_field(term, {type, store: context_name}, context)
     else
       {{:ok, <<>>}, context}
@@ -81,10 +81,10 @@ defmodule Membrane.MP4.Container.SerializeHelper do
   end
 
   defp serialize_field(term, {type, when: condition}, context) do
-    {flag, key} = condition
+    {flag_value, key, mask} = condition
     context_object = Map.get(context, key, 0)
 
-    if (flag &&& context_object) == flag do
+    if (mask &&& context_object) == flag_value do
       serialize_field(term, type, context)
     else
       {{:ok, <<>>}, context}
diff --git a/lib/membrane_mp4/movie_box/sample_table_box.ex b/lib/membrane_mp4/movie_box/sample_table_box.ex
index 59a1af1..eea4942 100644
--- a/lib/membrane_mp4/movie_box/sample_table_box.ex
+++ b/lib/membrane_mp4/movie_box/sample_table_box.ex
@@ -240,7 +240,7 @@ defmodule Membrane.MP4.MovieBox.SampleTableBox do
       sample_description: unpack_sample_description(boxes[:stsd]),
       sample_count: boxes[:stsz].fields.sample_count,
       sample_sizes: unpack_sample_sizes(boxes[:stsz]),
-      chunk_offsets: unpack_chunk_offsets(boxes[:stco]),
+      chunk_offsets: unpack_chunk_offsets(boxes[:stco] || boxes[:co64]),
       decoding_deltas: boxes[:stts].fields.entry_list,
       composition_offsets: get_composition_offsets(boxes),
       samples_per_chunk: boxes[:stsc].fields.entry_list,