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[postprocessor/ffmpeg] Don't let ffmpeg read from stdin (fixes #4945)
If you run 'while read aurl ; do youtube-dl --extract-audio "${aurl}"; done < path_to_batch_file' (batch_file contains one url per line) each call to youtube-dl consumed some characters and 'read' would assing to 'aurl' a non valid url, something like 'tube.com/watch?v=<id>'.
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@ -95,7 +95,7 @@ class FFmpegPostProcessor(PostProcessor):
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if self._downloader.params.get('verbose', False):
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self._downloader.to_screen('[debug] ffmpeg command line: %s' % shell_quote(cmd))
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
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stdout, stderr = p.communicate()
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if p.returncode != 0:
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stderr = stderr.decode('utf-8', 'replace')
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@ -134,7 +134,7 @@ class FFmpegExtractAudioPP(FFmpegPostProcessor):
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encodeFilename(self._probe_executable, True),
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encodeArgument('-show_streams'),
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encodeFilename(self._ffmpeg_filename_argument(path), True)]
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handle = subprocess.Popen(cmd, stderr=compat_subprocess_get_DEVNULL(), stdout=subprocess.PIPE)
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handle = subprocess.Popen(cmd, stderr=compat_subprocess_get_DEVNULL(), stdout=subprocess.PIPE, stdin=subprocess.PIPE)
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output = handle.communicate()[0]
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if handle.wait() != 0:
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return None
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