diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index a38af2c08..3e1053eb0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -5,12 +5,12 @@ on:
   workflow_dispatch:
 jobs:
   package-source:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.13"
+          python-version: "3.12"
       - name: Build source package
         run: |
           pip install -U --pre cython setuptools
@@ -28,32 +28,32 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos-14
-            arch: arm64
-          - os: macos-13
-            arch: x86_64
-          - os: ubuntu-24.04-arm
-            arch: aarch64
-          - os: ubuntu-24.04
-            arch: i686
+          #- os: macos-14
+          #  arch: arm64
+          #- os: macos-13
+          #  arch: x86_64
+          #- os: ubuntu-24.04-arm
+          #  arch: aarch64
+          #- os: ubuntu-24.04
+          #  arch: i686
           - os: ubuntu-24.04
             arch: x86_64
-          - os: windows-latest
-            arch: AMD64
+          #- os: windows-latest
+          #  arch: AMD64
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.13"
-      - name: Install packages
-        if: matrix.os == 'macos-13'
-        run: |
-          brew update
-          brew install pkg-config
-      - name: Set Minimum MacOS Target
-        if: matrix.os == 'macos-13' || matrix.os == 'macos-14'
-        run: |
-          echo "MACOSX_DEPLOYMENT_TARGET=12.0" >> $GITHUB_ENV
+          python-version: "3.12"
+      # - name: Install packages
+      #   if: matrix.os == 'macos-13'
+      #   run: |
+      #     brew update
+      #     brew install pkg-config
+      # - name: Set Minimum MacOS Target
+      #   if: matrix.os == 'macos-13' || matrix.os == 'macos-14'
+      #   run: |
+      #     echo "MACOSX_DEPLOYMENT_TARGET=12.0" >> $GITHUB_ENV
       - name: Build wheels
         env:
           CIBW_ARCHS: ${{ matrix.arch }}
diff --git a/av/sidedata/sidedata.pyx b/av/sidedata/sidedata.pyx
index 24dbae119..1d1495ff3 100644
--- a/av/sidedata/sidedata.pyx
+++ b/av/sidedata/sidedata.pyx
@@ -4,7 +4,9 @@ from collections.abc import Mapping
 from enum import Enum
 
 from av.sidedata.motionvectors import MotionVectors
+from libc.string cimport memcpy
 
+from av.bytesource cimport ByteSource, bytesource
 
 cdef object _cinit_bypass_sentinel = object()
 
@@ -110,6 +112,20 @@ cdef class _SideDataContainer:
         if isinstance(key, str):
             return self._by_type[Type[key]]
         return self._by_type[key]
+    
+    def add(self,buffer,type):
+       # Add Frame side data
+        cdef ByteSource source = bytesource(buffer)
+        i = self.frame.ptr.nb_side_data
+        lib.av_frame_make_writable(self.frame.ptr)
+        ptr = lib.av_frame_new_side_data(self.frame.ptr, type, source.length)
+
+        memcpy(ptr.data, source.ptr, source.length)
+
+        # Update side data
+        cdef SideData data = wrap_side_data(self.frame, i)
+        self._by_index.append(data)
+        self._by_type[data.type] = data
 
 
 class SideDataContainer(_SideDataContainer, Mapping):
diff --git a/include/libavutil/frame.pxd b/include/libavutil/frame.pxd
index aa8dc3a00..1522083ff 100644
--- a/include/libavutil/frame.pxd
+++ b/include/libavutil/frame.pxd
@@ -12,3 +12,4 @@ cdef extern from "libavutil/frame.h" nogil:
     cdef int av_frame_copy(AVFrame *dst, const AVFrame *src)
     cdef int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
     cdef AVFrameSideData* av_frame_get_side_data(AVFrame *frame, AVFrameSideDataType type)
+    cdef AVFrameSideData * av_frame_new_side_data(AVFrame *frame, AVFrameSideDataType type, int size)