diff --git a/av/error.pyx b/av/error.pyx
index cde4fec7f..e6257731e 100644
--- a/av/error.pyx
+++ b/av/error.pyx
@@ -200,23 +200,20 @@ for enum in ErrorType:
 # Mimick the builtin exception types.
 # See https://www.python.org/dev/peps/pep-3151/#new-exception-classes
 # Use the named ones we have, otherwise default to OSError for anything in errno.
-r'''
 
-See this command for the count of POSIX codes used:
-
-    egrep -IR 'AVERROR\(E[A-Z]+\)' vendor/ffmpeg-4.2 |\
-        sed -E 's/.*AVERROR\((E[A-Z]+)\).*/\1/' | \
-        sort | uniq -c
-
-The biggest ones that don't map to PEP 3151 builtins:
-
-    2106 EINVAL -> ValueError
-     649 EIO    -> IOError (if it is distinct from OSError)
-    4080 ENOMEM -> MemoryError
-     340 ENOSYS -> NotImplementedError
-      35 ERANGE -> OverflowError
-
-'''
+# See this command for the count of POSIX codes used:
+#
+#    egrep -IR 'AVERROR\(E[A-Z]+\)' vendor/ffmpeg-4.2 |\
+#        sed -E 's/.*AVERROR\((E[A-Z]+)\).*/\1/' | \
+#        sort | uniq -c
+#
+# The biggest ones that don't map to PEP 3151 builtins:
+#
+#    2106 EINVAL -> ValueError
+#     649 EIO    -> IOError (if it is distinct from OSError)
+#    4080 ENOMEM -> MemoryError
+#     340 ENOSYS -> NotImplementedError
+#      35 ERANGE -> OverflowError
 
 classes = {}
 
diff --git a/include/libavcodec/avcodec.pxd b/include/libavcodec/avcodec.pxd
index 11d968b1a..e11e9c115 100644
--- a/include/libavcodec/avcodec.pxd
+++ b/include/libavcodec/avcodec.pxd
@@ -30,7 +30,7 @@ cdef extern from "libavcodec/avcodec.h" nogil:
         AV_CODEC_PROP_BITMAP_SUB
         AV_CODEC_PROP_TEXT_SUB
 
-    #AVCodec.capabilities
+    # AVCodec.capabilities
     cdef enum:
         AV_CODEC_CAP_DRAW_HORIZ_BAND
         AV_CODEC_CAP_DR1
@@ -131,7 +131,6 @@ cdef extern from "libavcodec/avcodec.h" nogil:
 
         AVClass *priv_class
 
-
     cdef int av_codec_is_encoder(AVCodec*)
     cdef int av_codec_is_decoder(AVCodec*)
 
@@ -144,7 +143,6 @@ cdef extern from "libavcodec/avcodec.h" nogil:
 
     AVCodecDescriptor* avcodec_descriptor_get(AVCodecID)
 
-
     cdef struct AVCodecContext:
 
         AVClass *av_class
@@ -203,7 +201,7 @@ cdef extern from "libavcodec/avcodec.h" nogil:
 
         AVPixelFormat pix_fmt
         AVRational sample_aspect_ratio
-        int gop_size # The number of pictures in a group of pictures, or 0 for intra_only.
+        int gop_size  # The number of pictures in a group of pictures, or 0 for intra_only.
         int max_b_frames
         int has_b_frames
 
@@ -288,15 +286,15 @@ cdef extern from "libavcodec/avcodec.h" nogil:
 
     # See: http://ffmpeg.org/doxygen/trunk/structAVFrame.html
     cdef struct AVFrame:
-        uint8_t *data[4];
-        int linesize[4];
+        uint8_t *data[4]
+        int linesize[4]
         uint8_t **extended_data
 
-        int format # Should be AVPixelFormat or AVSampleFormat
-        int key_frame # 0 or 1.
+        int format  # Should be AVPixelFormat or AVSampleFormat
+        int key_frame  # 0 or 1.
         AVPictureType pict_type
 
-        int interlaced_frame # 0 or 1.
+        int interlaced_frame  # 0 or 1.
 
         int width
         int height
@@ -304,10 +302,10 @@ cdef extern from "libavcodec/avcodec.h" nogil:
         int nb_side_data
         AVFrameSideData **side_data
 
-        int nb_samples # Audio samples
-        int sample_rate # Audio Sample rate
-        int channels # Number of audio channels
-        int channel_layout # Audio channel_layout
+        int nb_samples  # Audio samples
+        int sample_rate  # Audio Sample rate
+        int channels  # Number of audio channels
+        int channel_layout  # Audio channel_layout
 
         int64_t pts
         int64_t pkt_dts
@@ -320,7 +318,6 @@ cdef extern from "libavcodec/avcodec.h" nogil:
         int flags
         int decode_error_flags
 
-
     cdef AVFrame* avcodec_alloc_frame()
 
     cdef struct AVPacket:
@@ -337,7 +334,6 @@ cdef extern from "libavcodec/avcodec.h" nogil:
 
         int64_t pos
 
-
     cdef int avcodec_fill_audio_frame(
         AVFrame *frame,
         int nb_channels,
@@ -367,8 +363,8 @@ cdef extern from "libavcodec/avcodec.h" nogil:
         int w
         int h
         int nb_colors
-        uint8_t *data[4];
-        int linesize[4];
+        uint8_t *data[4]
+        int linesize[4]
         AVSubtitleType type
         char *text
         char *ass
@@ -402,7 +398,7 @@ cdef extern from "libavcodec/avcodec.h" nogil:
 
     cdef void avcodec_flush_buffers(AVCodecContext *ctx)
 
-     # TODO: avcodec_default_get_buffer is deprecated for avcodec_default_get_buffer2 in newer versions of FFmpeg
+    # TODO: avcodec_default_get_buffer is deprecated for avcodec_default_get_buffer2 in newer versions of FFmpeg
     cdef int avcodec_default_get_buffer(AVCodecContext *ctx, AVFrame *frame)
     cdef void avcodec_default_release_buffer(AVCodecContext *ctx, AVFrame *frame)
 
@@ -440,7 +436,6 @@ cdef extern from "libavcodec/avcodec.h" nogil:
     )
     cdef void av_parser_close(AVCodecParserContext *s)
 
-
     cdef struct AVCodecParameters:
         AVMediaType codec_type
         AVCodecID codec_id
diff --git a/include/libavfilter/avfilter.pxd b/include/libavfilter/avfilter.pxd
index e1fd42f45..dd3e91ddf 100644
--- a/include/libavfilter/avfilter.pxd
+++ b/include/libavfilter/avfilter.pxd
@@ -45,7 +45,7 @@ cdef extern from "libavfilter/avfilter.h" nogil:
     cdef AVFilter* avfilter_get_by_name(const char *name)
     cdef const AVFilter* av_filter_iterate(void **opaque)
 
-    cdef struct AVFilterLink # Defined later.
+    cdef struct AVFilterLink  # Defined later.
 
     cdef struct AVFilterContext:
 
diff --git a/include/libavfilter/avfiltergraph.pxd b/include/libavfilter/avfiltergraph.pxd
index db9717a50..b773063f9 100644
--- a/include/libavfilter/avfiltergraph.pxd
+++ b/include/libavfilter/avfiltergraph.pxd
@@ -11,7 +11,6 @@ cdef extern from "libavfilter/avfilter.h" nogil:
         int pad_idx
         AVFilterInOut *next
 
-
     cdef AVFilterGraph* avfilter_graph_alloc()
     cdef void avfilter_graph_free(AVFilterGraph **ptr)
 
diff --git a/include/libavformat/avformat.pxd b/include/libavformat/avformat.pxd
index 06029d9f9..a4d5991d8 100644
--- a/include/libavformat/avformat.pxd
+++ b/include/libavformat/avformat.pxd
@@ -16,7 +16,6 @@ cdef extern from "libavformat/avformat.h" nogil:
     cdef int AVSEEK_FLAG_ANY
     cdef int AVSEEK_FLAG_FRAME
 
-
     cdef int AVIO_FLAG_WRITE
 
     cdef enum AVMediaType:
@@ -207,10 +206,10 @@ cdef extern from "libavformat/avformat.h" nogil:
     #       .. seealso:: FFmpeg's docs: :ffmpeg:`avformat_open_input`
     #
     cdef int avformat_open_input(
-        AVFormatContext **ctx, # NULL will allocate for you.
+        AVFormatContext **ctx,  # NULL will allocate for you.
         char *filename,
-        AVInputFormat *format, # Can be NULL.
-        AVDictionary **options # Can be NULL.
+        AVInputFormat *format,  # Can be NULL.
+        AVDictionary **options  # Can be NULL.
     )
 
     cdef int avformat_close_input(AVFormatContext **ctx)
@@ -224,7 +223,7 @@ cdef extern from "libavformat/avformat.h" nogil:
     #
     cdef int avformat_write_header(
         AVFormatContext *ctx,
-        AVDictionary **options # Can be NULL
+        AVDictionary **options  # Can be NULL
     )
 
     cdef int av_write_trailer(AVFormatContext *ctx)
@@ -269,7 +268,7 @@ cdef extern from "libavformat/avformat.h" nogil:
 
     cdef int avformat_find_stream_info(
         AVFormatContext *ctx,
-        AVDictionary **options, # Can be NULL.
+        AVDictionary **options,  # Can be NULL.
     )
 
     cdef AVStream* avformat_new_stream(
diff --git a/include/libavutil/avutil.pxd b/include/libavutil/avutil.pxd
index 50e6bfffd..d93016d3b 100644
--- a/include/libavutil/avutil.pxd
+++ b/include/libavutil/avutil.pxd
@@ -39,7 +39,6 @@ cdef extern from "libavutil/avutil.h" nogil:
         # This is nice, but only in FFMpeg:
         # AV_ROUND_PASS_MINMAX
 
-
     cdef double M_PI
 
     cdef void* av_malloc(size_t size)
@@ -67,9 +66,9 @@ cdef extern from "libavutil/avutil.h" nogil:
 
     # Rescales from one time base to another
     cdef int64_t av_rescale_q(
-        int64_t a, # time stamp
-        AVRational bq, # source time base
-        AVRational cq  # target time base
+        int64_t a,  # time stamp
+        AVRational bq,  # source time base
+        AVRational cq   # target time base
     )
 
     # Rescale a 64-bit integer with specified rounding.
@@ -78,14 +77,14 @@ cdef extern from "libavutil/avutil.h" nogil:
         int64_t a,
         int64_t b,
         int64_t c,
-        int r # should be AVRounding, but then we can't use bitwise logic.
+        int r  # should be AVRounding, but then we can't use bitwise logic.
     )
 
     cdef int64_t av_rescale_q_rnd(
         int64_t a,
         AVRational bq,
         AVRational cq,
-        int r # should be AVRounding, but then we can't use bitwise logic.
+        int r  # should be AVRounding, but then we can't use bitwise logic.
     )
 
     cdef int64_t av_rescale(
@@ -146,7 +145,6 @@ cdef extern from "libavutil/pixdesc.h" nogil:
     int av_get_padded_bits_per_pixel(AVPixFmtDescriptor *pixdesc)
 
 
-
 cdef extern from "libavutil/channel_layout.h" nogil:
 
     # Layouts.
@@ -166,8 +164,6 @@ cdef extern from "libavutil/channel_layout.h" nogil:
     cdef char* av_get_channel_description(uint64_t channel)
 
 
-
-
 cdef extern from "libavutil/audio_fifo.h" nogil:
 
     cdef struct AVAudioFifo:
diff --git a/include/libavutil/error.pxd b/include/libavutil/error.pxd
index 8919c54b7..2122772e3 100644
--- a/include/libavutil/error.pxd
+++ b/include/libavutil/error.pxd
@@ -4,7 +4,6 @@ cdef extern from "libavutil/error.h" nogil:
     cdef int ENOMEM
     cdef int EAGAIN
 
-
     cdef int AVERROR_BSF_NOT_FOUND
     cdef int AVERROR_BUG
     cdef int AVERROR_BUFFER_TOO_SMALL
diff --git a/include/libavutil/samplefmt.pxd b/include/libavutil/samplefmt.pxd
index 867367ee1..a26c6ecfd 100644
--- a/include/libavutil/samplefmt.pxd
+++ b/include/libavutil/samplefmt.pxd
@@ -12,7 +12,7 @@ cdef extern from "libavutil/samplefmt.h" nogil:
         AV_SAMPLE_FMT_S32P
         AV_SAMPLE_FMT_FLTP
         AV_SAMPLE_FMT_DBLP
-        AV_SAMPLE_FMT_NB # Number.
+        AV_SAMPLE_FMT_NB  # Number.
 
     # Find by name.
     cdef AVSampleFormat av_get_sample_fmt(char* name)
@@ -43,7 +43,6 @@ cdef extern from "libavutil/samplefmt.h" nogil:
         int align
     )
 
-
     cdef int av_samples_fill_arrays(
         uint8_t **audio_data,
         int *linesize,
diff --git a/include/libswresample/swresample.pxd b/include/libswresample/swresample.pxd
index d76b777a3..65b8314df 100644
--- a/include/libswresample/swresample.pxd
+++ b/include/libswresample/swresample.pxd
@@ -7,7 +7,6 @@ cdef extern from "libswresample/swresample.h" nogil:
     cdef char* swresample_configuration()
     cdef char* swresample_license()
 
-
     cdef struct SwrContext:
         pass
 
@@ -20,7 +19,7 @@ cdef extern from "libswresample/swresample.h" nogil:
         AVSampleFormat in_sample_fmt,
         int in_sample_rate,
         int log_offset,
-        void *log_ctx #logging context, can be NULL
+        void *log_ctx  # logging context, can be NULL
     )
 
     cdef int swr_convert(