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[postprocessor/ffmpeg] simplify media info extraction using ffprobe

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This commit is contained in:
remitamine 2016-03-02 10:00:16 +01:00
parent 90f794c6c3
commit ffbb5f0568
1 changed files with 28 additions and 22 deletions
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50
youtube_dl/postprocessor/ffmpeg.py
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@ -4,6 +4,7 @@ import io
import os
import subprocess
import time
import json
from .common import AudioConversionError, PostProcessor
@ -164,6 +165,28 @@ class FFmpegPostProcessor(PostProcessor):
# ffmpeg, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details)
return 'file:' + fn
def probe(self, path, info_type):
if not self.probe_available:
raise PostProcessingError('ffprobe or avprobe not found. Please install one.')
try:
cmd = [
encodeFilename(self.probe_executable, True),
encodeArgument('-loglevel'),
encodeArgument('error'),
encodeArgument('-print_format'),
encodeArgument('json'),
encodeArgument('-show_%s' % info_type),
encodeFilename(self._ffmpeg_filename_argument(path), True)]
if self._downloader.params.get('verbose', False):
self._downloader.to_screen('[debug] %s command line: %s' % (self.basename, shell_quote(cmd)))
handle = subprocess.Popen(cmd, stderr=compat_subprocess_get_DEVNULL(), stdout=subprocess.PIPE, stdin=subprocess.PIPE)
output = handle.communicate()[0]
if handle.wait() != 0:
return None
return json.loads(output)[info_type]
except (IOError, OSError):
return None
class FFmpegExtractAudioPP(FFmpegPostProcessor):
def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, nopostoverwrites=False):
@ -175,28 +198,11 @@ class FFmpegExtractAudioPP(FFmpegPostProcessor):
self._nopostoverwrites = nopostoverwrites
def get_audio_codec(self, path):
if not self.probe_available:
raise PostProcessingError('ffprobe or avprobe not found. Please install one.')
try:
cmd = [
encodeFilename(self.probe_executable, True),
encodeArgument('-show_streams'),
encodeFilename(self._ffmpeg_filename_argument(path), True)]
if self._downloader.params.get('verbose', False):
self._downloader.to_screen('[debug] %s command line: %s' % (self.basename, shell_quote(cmd)))
handle = subprocess.Popen(cmd, stderr=compat_subprocess_get_DEVNULL(), stdout=subprocess.PIPE, stdin=subprocess.PIPE)
output = handle.communicate()[0]
if handle.wait() != 0:
return None
except (IOError, OSError):
return None
audio_codec = None
for line in output.decode('ascii', 'ignore').split('\n'):
if line.startswith('codec_name='):
audio_codec = line.split('=')[1].strip()
elif line.strip() == 'codec_type=audio' and audio_codec is not None:
return audio_codec
streams = self.probe(path, 'streams')
if streams:
for stream in streams:
if stream.get('codec_type') == 'audio':
return stream.get('codec_name')
return None
def run_ffmpeg(self, path, out_path, codec, more_opts):