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# In case this module is invoked from other modules, e.g., preprocessing
from pathlib import Path
import sys
sys.path.append(str(Path.cwd() / "annotation"))
import decord as de
from datatypes import Metadata
from typing import List
import os
from multiprocessing import cpu_count
import traceback
from pathlib import Path
def convert_to_linux_path(path: str) -> str:
return Path(path).as_posix()
def extract_label(path: str) -> str:
idx = len(path) - 1
while idx >= 0:
if path[idx].isnumeric():
return path[idx]
idx -= 1
return '-1'
def get_duration(path: str) -> int:
try:
vr = de.VideoReader(path, ctx=de.cpu(0), num_threads=1)
return int(len(vr) / vr.get_avg_fps())
except Exception as e:
print(f"Error reading video {path}: {e}")
print(traceback.format_exc()) # Include the full traceback for debugging
return -1 # Use -1 to indicate an invalid duration
def filter_video(path: str, **kwargs) -> bool:
try:
max_duration = kwargs.get('max_duration', None)
if max_duration is not None:
duration = get_duration(path)
if duration == -1: # Handle invalid duration
print(f"Skipping invalid video: {path}")
return False
return duration <= max_duration
return True
except Exception as e:
print(f"Error in filter_video for {path}: {e}")
return False
def get_optimal_workers() -> int:
"""Determine the optimal number of workers based on available CPU cores."""
try:
return max(1, cpu_count() - 1) # Leave one core free
except (NotImplementedError, ValueError):
return 1 # Fallback to a single worker in case of an error
def get_metadata(
folder_paths: List[str]
) -> Metadata:
metadata: Metadata = []
for folder_path in folder_paths:
label: str = extract_label(folder_path)
assert label != '-1', f"Invalid folder path: {folder_path}"
for file_name in os.listdir(folder_path):
file_path: str = os.path.join(folder_path.rstrip('/'), file_name)
if os.path.exists(file_path) and os.path.isfile(file_path):
metadata.append((file_path, label))
print(f'Found {len(metadata)} videos')
return metadata |