224 lines
8.3 KiB
Python
224 lines
8.3 KiB
Python
import os
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import hashlib
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import subprocess
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import json
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import logging
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import folder_paths
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class VideoMetadataCache:
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instance = None
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template = """
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{
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"last_node_id": 1,
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"last_link_id": 0,
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"nodes": [
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{
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"id": 1,
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"type": "MontagenDefaultLoadVideo",
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"pos": [
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1009.0526733398438,
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565.4109497070312
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],
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"size": [
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315,
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58
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],
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"flags": {},
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"order": 0,
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"mode": 0,
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"inputs": [],
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"outputs": [],
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"properties": {
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"Node name for S&R": "MontagenDefaultLoadVideo"
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},
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"widgets_values": [
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"{relative_path}"
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]
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}
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],
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"links": [],
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"groups": [],
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"config": {},
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"extra": {
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"ds": {
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"scale": 0.7513148009015781,
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"offset": [
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-563.6113369820617,
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-206.78960955150157
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]
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}
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},
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"version": 0.4
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}
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"""
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def __init__(self):
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self.cache = {}
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VideoMetadataCache.instance = self
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@staticmethod
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def hash(video_path, block_size=65536):
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file_size = os.path.getsize(video_path)
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m = hashlib.sha256()
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with open(video_path, "rb") as f:
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# 读取文件开头部分
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m.update(f.read(block_size))
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# 读取文件中间部分
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if file_size > block_size * 2:
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f.seek(file_size // 2)
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m.update(f.read(block_size))
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# 读取文件结尾部分
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if file_size > block_size:
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f.seek(-block_size, os.SEEK_END)
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m.update(f.read(block_size))
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return m.hexdigest()
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def getMetadata(self, video_path):
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video_hash = self.hash(video_path)
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if video_hash in self.cache:
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return self.cache[video_hash]
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else:
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metadata = self._extractMetadata(video_path)
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self.cache[video_hash] = metadata
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return metadata
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def _extractMetadata(self, video_path):
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if self._isVideoFile(video_path):
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try:
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metadata = self._parseVideoMetadata(video_path)
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if metadata:
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if "workflow" in metadata:
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return metadata["workflow"]
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except Exception as e:
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logging.exception(f"Error parsing video metadata: {e}")
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cmd = ["ffmpeg", "-i", video_path, "-f", "ffmetadata", "-"]
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try:
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result = subprocess.run(
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cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True
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)
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if result.returncode != 0:
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raise Exception(f"ffmpeg error: {result.stderr}")
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metadata_str = result.stdout
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metadata_json = self._parseFfmetadata(metadata_str)
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if "workflow" in metadata_json:
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return metadata_json["workflow"]
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raise Exception(f"empty workflow metadata")
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except Exception as e:
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logging.exception(f"Error parsing video metadata: {e}")
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relative_path = os.path.relpath(
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video_path, folder_paths.get_output_directory()
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).strip("/")
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relative_path = json.dumps(relative_path).strip('"')
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return json.loads(self.template.replace("{relative_path}", relative_path))
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def _parseFfmetadata(self, metadata_str):
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metadata = {}
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lines = metadata_str.splitlines()
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for line in lines:
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if line.startswith(";"):
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continue
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key_value = line.split("=", 1)
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if len(key_value) == 2:
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key, value = key_value
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# 尝试解析值为 JSON
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try:
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parsed_value = json.loads(value)
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metadata[key] = parsed_value
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except json.JSONDecodeError:
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metadata[key] = value
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return metadata
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def _parseVideoMetadata(self, video_path):
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buffer_size = 65536 # 64KB buffer size
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try:
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with open(video_path, "rb") as f:
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buffer = f.read(buffer_size)
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if buffer[:4] == b"\x1A\x45\xDF\xA3":
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# webm
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offset = 4 + 8
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f.seek(offset)
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while True:
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i = 0
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buffer = f.read(buffer_size)
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bufferlen = len(buffer)
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if not buffer:
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break
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while i < (bufferlen - 16):
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if buffer[i : i + 2] == b"\x44\x87":
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f.seek(i - 7 - bufferlen, os.SEEK_CUR)
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buffer = f.read(buffer_size)
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bufferlen = len(buffer)
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i = 7
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name = buffer[i - 7 : i].decode("utf-8")
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if name == "COMMENT":
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vint = int.from_bytes(buffer[i + 2 : i + 6], "big")
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n_octets = (vint.bit_length() + 7) // 8
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if n_octets < 4:
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length = (vint >> (8 * (4 - n_octets))) & ~(
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1 << (7 * n_octets)
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)
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f.seek(
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i + 2 + n_octets - bufferlen, os.SEEK_CUR
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)
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content = f.read(length)
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content = content.decode("utf-8")
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try:
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json_content = json.loads(content)
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return json_content
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except json.JSONDecodeError:
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pass
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i = 8
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i = i + 1
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else:
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if buffer[4:8] == b"ftyp" and buffer[8:12] == b"isom":
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bufferlen = 0
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f.seek(-buffer_size, os.SEEK_END)
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while f.tell() > 16:
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buffer = f.read(buffer_size)
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bufferlen = len(buffer)
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i = bufferlen - 4
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while i >= 0:
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if buffer[i : i + 4] == b"data":
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f.seek(i - 8 - bufferlen, os.SEEK_CUR)
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buffer = f.read(buffer_size)
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bufferlen = len(buffer)
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i = 0
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if buffer[0:4] == b"\xa9cmt":
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size = int.from_bytes(buffer[4:8], "big") - 16
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f.seek(20 - len(buffer), os.SEEK_CUR)
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buffer = f.read(size)
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content = buffer[0:size].decode("utf-8")
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try:
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json_content = json.loads(content)
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return json_content
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except json.JSONDecodeError:
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pass
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i = i - 1
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f.seek(-buffer_size - bufferlen, os.SEEK_CUR)
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else:
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raise ValueError("Unknown video format")
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except Exception as e:
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logging.exception("Error parsing video metadata")
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return {}
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def _isVideoFile(self, file):
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# Implement your logic to check if the file is a video file
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return file.endswith((".mp4",))
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VideoMetadataCache()
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