54a0d72dc8
By default FFmpeg assumes a 25 FPS input frame rate, leading to dropped frames if the source requires a higher frame rate than that. This commit adds a `framerate` option (default "auto"), which allows to automatically assign a (more or less) fitting frame rate based on delays between ugoira frames and avoids dropped frames.
98 lines
3.3 KiB
Python
98 lines
3.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2018 Mike Fährmann
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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"""Convert pixiv ugoira to webm"""
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from .common import PostProcessor
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from .. import util
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import collections
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import subprocess
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import tempfile
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import zipfile
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import os
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class UgoiraPP(PostProcessor):
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def __init__(self, pathfmt, options):
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PostProcessor.__init__(self)
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self.extension = options.get("extension") or "webm"
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self.args = options.get("ffmpeg-args")
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self.twopass = options.get("ffmpeg-twopass")
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self.delete = not options.get("keep-files", False)
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ffmpeg = options.get("ffmpeg-location")
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self.ffmpeg = util.expand_path(ffmpeg) if ffmpeg else "ffmpeg"
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rate = options.get("framerate", "auto")
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if rate != "auto":
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self.calculate_framerate = lambda _: (None, rate)
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def run(self, pathfmt):
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if (pathfmt.keywords["extension"] != "zip" or
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"frames" not in pathfmt.keywords):
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return
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framelist = pathfmt.keywords["frames"]
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rate_in, rate_out = self.calculate_framerate(framelist)
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with tempfile.TemporaryDirectory() as tempdir:
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# extract frames
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with zipfile.ZipFile(pathfmt.temppath) as zfile:
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zfile.extractall(tempdir)
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# write ffconcat file
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ffconcat = tempdir + "/ffconcat.txt"
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with open(ffconcat, "w") as file:
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file.write("ffconcat version 1.0\n")
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for frame in framelist:
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file.write("file '{}'\n".format(frame["file"]))
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file.write("duration {}\n".format(frame["delay"] / 1000))
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if self.extension != "gif":
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# repeat the last frame to prevent it from only being
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# displayed for a very short amount of time
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file.write("file '{}'\n".format(framelist[-1]["file"]))
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# collect command-line arguments
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args = [self.ffmpeg]
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if rate_in:
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args += ["-r", str(rate_in)]
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args += ["-i", ffconcat]
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if rate_out:
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args += ["-r", str(rate_out)]
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if self.args:
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args += self.args
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self.log.debug("ffmpeg args: %s", args)
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# invoke ffmpeg
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pathfmt.set_extension(self.extension)
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if self.twopass:
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if "-f" not in args:
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args += ["-f", self.extension]
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null = "NUL" if os.name == "nt" else "/dev/null"
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args += ["-passlogfile", tempdir + "/ffmpeg2pass", "-pass"]
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subprocess.Popen(args + ["1", "-y", null]).wait()
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subprocess.Popen(args + ["2", pathfmt.realpath]).wait()
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else:
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args.append(pathfmt.realpath)
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subprocess.Popen(args).wait()
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if self.delete:
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pathfmt.delete = True
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else:
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pathfmt.set_extension("zip")
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@staticmethod
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def calculate_framerate(framelist):
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counter = collections.Counter(frame["delay"] for frame in framelist)
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fps = "1000/{}".format(min(counter))
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return (fps, None) if len(counter) == 1 else (None, fps)
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__postprocessor__ = UgoiraPP
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