[ffmpeg] Make downloader optional (Fixes #4039)
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		@@ -42,7 +42,7 @@ class FFmpegPostProcessorError(PostProcessingError):
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class FFmpegPostProcessor(PostProcessor):
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    def __init__(self, downloader, deletetempfiles=False):
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    def __init__(self, downloader=None, deletetempfiles=False):
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        PostProcessor.__init__(self, downloader)
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        self._versions = self.get_versions()
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        self._deletetempfiles = deletetempfiles
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@@ -56,7 +56,8 @@ class FFmpegPostProcessor(PostProcessor):
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                self._versions[self._executable], REQUIRED_VERSION):
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            warning = u'Your copy of %s is outdated, update %s to version %s or newer if you encounter any errors.' % (
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                self._executable, self._executable, REQUIRED_VERSION)
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            self._downloader.report_warning(warning)
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            if self._downloader:
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                self._downloader.report_warning(warning)
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    @staticmethod
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    def get_versions():
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