diff --git a/cidre/src/cm.rs b/cidre/src/cm.rs
index 5428d7fe..8f480e6c 100644
--- a/cidre/src/cm.rs
+++ b/cidre/src/cm.rs
@@ -34,6 +34,10 @@ pub use tag_collection::TagCollection;
 pub use tag_collection::TagCollectionMut;
 pub use tag_collection::err as tag_collection_err;
 
+mod tagged_buffer_group;
+pub use tagged_buffer_group::TaggedBufGroup;
+pub use tagged_buffer_group::err as tagged_buf_group_err;
+
 mod time;
 pub use time::Time;
 pub use time::TimeEpoch;
diff --git a/cidre/src/cm/tag_collection.rs b/cidre/src/cm/tag_collection.rs
index a2fe9726..d46a9c9d 100644
--- a/cidre/src/cm/tag_collection.rs
+++ b/cidre/src/cm/tag_collection.rs
@@ -108,11 +108,35 @@ impl TagCollection {
         }
     }
 
+    #[doc(alias = "CMTagCollectionContainsTag")]
     #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
     #[inline]
     pub fn contains(&self, val: cm::Tag) -> bool {
         unsafe { CMTagCollectionContainsTag(self, val) }
     }
+
+    #[doc(alias = "CMTagCollectionContainsTagsOfCollection")]
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    #[inline]
+    pub fn contains_collection(&self, val: &cm::TagCollection) -> bool {
+        unsafe { CMTagCollectionContainsTagsOfCollection(self, val) }
+    }
+
+    #[doc(alias = "CMTagCollectionContainsSpecifiedTags")]
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    #[inline]
+    pub fn contains_tags(&self, tags: &[cm::Tag]) -> bool {
+        unsafe { CMTagCollectionContainsSpecifiedTags(self, tags.as_ptr(), tags.len() as _) }
+    }
+
+    #[doc(alias = "CMTagCollectionContainsCategory")]
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    #[inline]
+    pub fn contains_catogery(&self, val: cm::TagCategory) -> bool {
+        unsafe { CMTagCollectionContainsCategory(self, val) }
+    }
+
+    // TODO: more api
 }
 
 #[link(name = "CoreMedia", kind = "framework")]
@@ -135,6 +159,25 @@ unsafe extern "C-unwind" {
 
     #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
     fn CMTagCollectionContainsTag(tag_collection: &TagCollection, val: cm::Tag) -> bool;
+
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    fn CMTagCollectionContainsTagsOfCollection(
+        tag_collection: &TagCollection,
+        contained_tag_collection: &TagCollection,
+    ) -> bool;
+
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    fn CMTagCollectionContainsSpecifiedTags(
+        tag_collection: &TagCollection,
+        contained_tags: *const cm::Tag,
+        contained_tag_count: cm::ItemCount,
+    ) -> bool;
+
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    fn CMTagCollectionContainsCategory(
+        tag_collection: &TagCollection,
+        category: cm::TagCategory,
+    ) -> bool;
 }
 
 #[cfg(test)]
@@ -148,5 +191,11 @@ mod tests {
 
         let tag = cm::Tag::with_f64(cm::TagCategory::MediaType, 0.0);
         assert!(!empty.contains(tag));
+        let empty2 = cm::TagCollection::with_tags(&[]).unwrap();
+
+        assert!(empty.contains_collection(&empty2));
+
+        assert!(empty.contains_tags(&[]));
+        assert!(!empty.contains_tags(&[tag]));
     }
 }
diff --git a/cidre/src/cm/tagged_buffer_group.rs b/cidre/src/cm/tagged_buffer_group.rs
new file mode 100644
index 00000000..00bd4fe2
--- /dev/null
+++ b/cidre/src/cm/tagged_buffer_group.rs
@@ -0,0 +1,109 @@
+use crate::{api, arc, cf, cm, define_cf_type, os};
+
+/// The os::Errors returned from the CMTaggedBufferGroup routines.
+#[doc(alias = "CMTaggedBufferGroupError")]
+pub mod err {
+    use crate::os::Error;
+
+    #[doc(alias = "kCMTaggedBufferGroupError_ParamErr")]
+    pub const PARAM_ERR: Error = Error::new_unchecked(-15780);
+
+    #[doc(alias = "kCMTaggedBufferGroupError_AllocationFailed")]
+    pub const ALLOC_FAILED: Error = Error::new_unchecked(-15781);
+
+    #[doc(alias = "kCMTaggedBufferGroupError_InternalError")]
+    pub const INTERNAL_ERR: Error = Error::new_unchecked(-15782);
+}
+
+define_cf_type!(
+    #[doc(alias = "CMTaggedBufferGroupRef")]
+    TaggedBufGroup(cf::Type)
+);
+
+impl TaggedBufGroup {
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    #[inline]
+    pub fn get_type_id() -> cf::Type {
+        unsafe { CMTaggedBufferGroupGetTypeID() }
+    }
+
+    #[doc(alias = "CMTaggedBufferGroupCreate")]
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    #[inline]
+    pub fn create_in(
+        tag_collections: &cf::ArrayOf<cm::TagCollection>,
+        buffers: &cf::ArrayOf<cf::Type>,
+        allocator: Option<&cf::Allocator>,
+    ) -> os::Result<Option<arc::R<Self>>> {
+        unsafe {
+            let mut res = None;
+            CMTaggedBufferGroupCreate(allocator, tag_collections, buffers, &mut res)
+                .to_result_option(res)
+        }
+    }
+
+    #[doc(alias = "CMTaggedBufferGroupCreate")]
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    #[inline]
+    pub fn with(
+        tag_collections: &cf::ArrayOf<cm::TagCollection>,
+        buffers: &cf::ArrayOf<cf::Type>,
+    ) -> os::Result<arc::R<Self>> {
+        unsafe {
+            let res = Self::create_in(tag_collections, buffers, None)?;
+            Ok(res.unwrap_unchecked())
+        }
+    }
+
+    #[doc(alias = "CMTaggedBufferGroupGetCount")]
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    #[inline]
+    pub fn count(&self) -> cm::ItemCount {
+        unsafe { CMTaggedBufferGroupGetCount(self) }
+    }
+
+    #[doc(alias = "CMTaggedBufferGroupGetCount")]
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    #[inline]
+    pub fn len(&self) -> usize {
+        self.count() as _
+    }
+
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    #[inline]
+    pub fn is_empty(&self) -> bool {
+        #[allow(unused_unsafe)]
+        unsafe {
+            self.len() == 0
+        }
+    }
+}
+
+#[link(name = "CoreMedia", kind = "framework")]
+#[api::weak]
+unsafe extern "C-unwind" {
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    fn CMTaggedBufferGroupGetTypeID() -> cf::Type;
+
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    fn CMTaggedBufferGroupCreate(
+        allocator: Option<&cf::Allocator>,
+        tag_collections: &cf::ArrayOf<cm::TagCollection>,
+        buffers: &cf::ArrayOf<cf::Type>,
+        group_out: *mut Option<arc::R<TaggedBufGroup>>,
+    ) -> os::Status;
+
+    #[api::available(macos = 14.0, ios = 17.0, tvos = 17.0, watchos = 10.0, visionos = 1.0)]
+    fn CMTaggedBufferGroupGetCount(group: &TaggedBufGroup) -> cm::ItemCount;
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{cf, cm};
+
+    #[test]
+    fn basics() {
+        let group = cm::TaggedBufGroup::with(&cf::ArrayOf::new(), &cf::ArrayOf::new()).unwrap();
+        assert!(group.is_empty());
+    }
+}