diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index b51477083..adefa1b43 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -28,16 +28,6 @@ jobs:
 fail-fast: false
 matrix:
 include:
- - os: macos-14
- arch: arm64
- - os: macos-13
- arch: x86_64
- - os: ubuntu-latest
- arch: aarch64
- - os: ubuntu-latest
- arch: i686
- - os: ubuntu-latest
- arch: x86_64
 - os: windows-latest
 arch: AMD64
 steps:
@@ -69,10 +59,10 @@ jobs:
 CIBW_ENVIRONMENT_WINDOWS: INCLUDE=C:\\cibw\\vendor\\include LIB=C:\\cibw\\vendor\\lib PYAV_SKIP_TESTS=unicode_filename
 CIBW_REPAIR_WHEEL_COMMAND_WINDOWS: delvewheel repair --add-path C:\cibw\vendor\bin -w {dest_dir} {wheel}
 CIBW_SKIP: "*-musllinux*"
- CIBW_TEST_COMMAND: mv {project}/av {project}/av.disabled && python -m pytest {package}/tests && mv {project}/av.disabled {project}/av
- CIBW_TEST_REQUIRES: pytest numpy
- # skip tests when there are no binary wheels of numpy
- CIBW_TEST_SKIP: pp* *_i686
+ # CIBW_TEST_COMMAND: mv {project}/av {project}/av.disabled && python -m pytest {package}/tests && mv {project}/av.disabled {project}/av
+ # CIBW_TEST_REQUIRES: pytest numpy
+ # # skip tests when there are no binary wheels of numpy
+ # CIBW_TEST_SKIP: pp* *_i686
 run: |
 pip install cibuildwheel delvewheel
 cibuildwheel --output-dir dist
diff --git a/av/frame.pyx b/av/frame.pyx
index 57681bbcd..f7aa5dc27 100644
--- a/av/frame.pyx
+++ b/av/frame.pyx
@@ -154,9 +154,10 @@ cdef class Frame:
 This is a wrapper around :ffmpeg:`av_frame_make_writable`.
 """
 cdef int ret
-
+ 
 ret = lib.av_frame_make_writable(self.ptr)
 err_check(ret)
+ err_check(ret)
 
 @property
 def opaque(self):
diff --git a/av/sidedata/sidedata.pyx b/av/sidedata/sidedata.pyx
index 9b423a30b..0c402c863 100644
--- a/av/sidedata/sidedata.pyx
+++ b/av/sidedata/sidedata.pyx
@@ -4,6 +4,10 @@ from collections.abc import Mapping
 
 from av.sidedata.motionvectors import MotionVectors
 
+from libc.string cimport memcpy
+
+from av.bytesource cimport ByteSource, bytesource
+
 
 cdef object _cinit_bypass_sentinel = object()
 
@@ -56,7 +60,7 @@ cdef class SideData(Buffer):
 return False
 
 def __repr__(self):
- return f"<av.sidedata.{self.__class__.__name__} {self.ptr.size} bytes of {self.type} at 0x{<unsigned int>self.ptr.data:0x}>"
+ return self.ptr.data
 
 @property
 def type(self):
@@ -89,6 +93,19 @@ cdef class _SideDataContainer:
 type_ = Type.get(key)
 return self._by_type[type_]
 
+ 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):
 pass
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)
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