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Improve saving animated GIF with ffmpeg #18093

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Merged
merged 2 commits into from
Jul 29, 2020
Merged

Improve saving animated GIF with ffmpeg #18093

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788503f
ENH: Improve saving animations in GIF from ffmpeg
dopplershift Jul 28, 2020
1c02381
BUG: Fix passing of parameters from save to MovieWriter
dopplershift Jul 28, 2020
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12 changes: 10 additions & 2 deletions lib/matplotlib/animation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -293,7 +293,8 @@ def __init__(self, fps=5, codec=None, bitrate=None, extra_args=None,
'MovieWriter cannot be instantiated directly. Please use one '
'of its subclasses.')

super().__init__(fps=fps, metadata=metadata)
super().__init__(fps=fps, metadata=metadata, codec=codec,
bitrate=bitrate)

self.frame_format = 'rgba'
self.extra_args = extra_args
Expand Down Expand Up @@ -554,7 +555,9 @@ class FFMpegBase:
@property
def output_args(self):
args = []
if not Path(self.outfile).suffix == '.gif':
if Path(self.outfile).suffix == '.gif':
self.codec = 'gif'
else:
args.extend(['-vcodec', self.codec])
extra_args = (self.extra_args if self.extra_args is not None
else mpl.rcParams[self._args_key])
Expand All @@ -564,6 +567,11 @@ def output_args(self):
# OSX). Also fixes internet explorer. This is as of 2015/10/29.
if self.codec == 'h264' and '-pix_fmt' not in extra_args:
args.extend(['-pix_fmt', 'yuv420p'])
# For GIF, we're telling FFMPEG to split the video stream, to generate
# a palette, and then use it for encoding.
elif self.codec == 'gif' and '-filter_complex' not in extra_args:
args.extend(['-filter_complex',
'split [a][b];[a] palettegen [p];[b][p] paletteuse'])
if self.bitrate > 0:
args.extend(['-b', '%dk' % self.bitrate]) # %dk: bitrate in kbps.
args.extend(extra_args)
Expand Down