See if we can not inherit from object

av/format.pyx

@@ -8,7 +8,7 @@ cdef object _cinit_bypass_sentinel = object()
 
 cdef ContainerFormat build_container_format(lib.AVInputFormat* iptr, lib.AVOutputFormat* optr):
     if not iptr and not optr:
-        raise ValueError('needs input format or output format')
+        raise ValueError("needs input format or output format")
     cdef ContainerFormat format = ContainerFormat.__new__(ContainerFormat, _cinit_bypass_sentinel)
     format.iptr = iptr
     format.optr = optr
@@ -18,31 +18,24 @@ cdef ContainerFormat build_container_format(lib.AVInputFormat* iptr, lib.AVOutpu
 
 Flags = define_enum('Flags', __name__, (
     ('NOFILE', lib.AVFMT_NOFILE),
-    ('NEEDNUMBER', lib.AVFMT_NEEDNUMBER,
-        """Needs '%d' in filename."""),
-    ('SHOW_IDS', lib.AVFMT_SHOW_IDS,
-        """Show format stream IDs numbers."""),
-    ('GLOBALHEADER', lib.AVFMT_GLOBALHEADER,
-        """Format wants global header."""),
+    ('NEEDNUMBER', lib.AVFMT_NEEDNUMBER, "Needs '%d' in filename."),
+    ('SHOW_IDS', lib.AVFMT_SHOW_IDS, "Show format stream IDs numbers."),
+    ('GLOBALHEADER', lib.AVFMT_GLOBALHEADER, "Format wants global header."),
     ('NOTIMESTAMPS', lib.AVFMT_NOTIMESTAMPS,
-        """Format does not need / have any timestamps."""),
-    ('GENERIC_INDEX', lib.AVFMT_GENERIC_INDEX,
-        """Use generic index building code."""),
+        "Format does not need / have any timestamps."),
+    ('GENERIC_INDEX', lib.AVFMT_GENERIC_INDEX, "Use generic index building code."),
     ('TS_DISCONT', lib.AVFMT_TS_DISCONT,
         """Format allows timestamp discontinuities.
         Note, muxers always require valid (monotone) timestamps"""),
-    ('VARIABLE_FPS', lib.AVFMT_VARIABLE_FPS,
-        """Format allows variable fps."""),
-    ('NODIMENSIONS', lib.AVFMT_NODIMENSIONS,
-        """Format does not need width/height"""),
-    ('NOSTREAMS', lib.AVFMT_NOSTREAMS,
-        """Format does not require any streams"""),
+    ('VARIABLE_FPS', lib.AVFMT_VARIABLE_FPS, "Format allows variable fps."),
+    ('NODIMENSIONS', lib.AVFMT_NODIMENSIONS, "Format does not need width/height"),
+    ('NOSTREAMS', lib.AVFMT_NOSTREAMS, "Format does not require any streams"),
     ('NOBINSEARCH', lib.AVFMT_NOBINSEARCH,
-        """Format does not allow to fall back on binary search via read_timestamp"""),
+        "Format does not allow to fall back on binary search via read_timestamp"),
     ('NOGENSEARCH', lib.AVFMT_NOGENSEARCH,
-        """Format does not allow to fall back on generic search"""),
+        "Format does not allow to fall back on generic search"),
     ('NO_BYTE_SEEK', lib.AVFMT_NO_BYTE_SEEK,
-        """Format does not allow seeking by bytes"""),
+        "Format does not allow seeking by bytes"),
     ('ALLOW_FLUSH', lib.AVFMT_ALLOW_FLUSH,
         """Format allows flushing. If not set, the muxer will not receive a NULL
         packet in the write_packet function."""),
@@ -54,23 +47,12 @@ Flags = define_enum('Flags', __name__, (
         will be shifted in av_write_frame and av_interleaved_write_frame so they
         start from 0. The user or muxer can override this through
         AVFormatContext.avoid_negative_ts"""),
-    ('SEEK_TO_PTS', lib.AVFMT_SEEK_TO_PTS,
-        """Seeking is based on PTS"""),
+    ('SEEK_TO_PTS', lib.AVFMT_SEEK_TO_PTS, "Seeking is based on PTS"),
 ), is_flags=True)
 
 
-cdef class ContainerFormat(object):
-
-    """Descriptor of a container format.
-
-    :param str name: The name of the format.
-    :param str mode: ``'r'`` or ``'w'`` for input and output formats; defaults
-        to None which will grab either.
-
-    """
-
+cdef class ContainerFormat:
     def __cinit__(self, name, mode=None):
-
         if name is _cinit_bypass_sentinel:
             return
 
@@ -90,7 +72,7 @@ cdef class ContainerFormat(object):
             raise ValueError('no container format %r' % name)
 
     def __repr__(self):
-        return '<av.%s %r>' % (self.__class__.__name__, self.name)
+        return f"<av.{self.__class__.__name__} {self.name!r}>"
 
     property descriptor:
         def __get__(self):
@@ -199,5 +181,4 @@ cdef get_input_format_names():
 formats_available = get_output_format_names()
 formats_available.update(get_input_format_names())
 
-
 format_descriptor = wrap_avclass(lib.avformat_get_class())

av/frame.pyx

@@ -5,13 +5,7 @@ from fractions import Fraction
 from av.sidedata.sidedata import SideDataContainer
 
 
-cdef class Frame(object):
-    """
-    Base class for audio and video frames.
-
-    See also :class:`~av.audio.frame.AudioFrame` and :class:`~av.video.frame.VideoFrame`.
-    """
-
+cdef class Frame:
     def __cinit__(self, *args, **kwargs):
         with nogil:
             self.ptr = lib.av_frame_alloc()