72 lines
2.1 KiB
Python
72 lines
2.1 KiB
Python
import io
|
||
import os
|
||
import tempfile
|
||
|
||
import cv2
|
||
|
||
from loguru import logger
|
||
|
||
|
||
def _get_first_frame(video_path, output_path):
|
||
"""
|
||
提取视频的第一帧并保存为图片
|
||
:param video_path: 视频文件路径
|
||
:param output_path: 输出图片路径
|
||
:return: 输出图片的绝对路径，如果失败则返回None
|
||
"""
|
||
cap = None
|
||
try:
|
||
logger.info(f"开始提取视频首帧: {video_path}")
|
||
# 打开视频文件
|
||
cap = cv2.VideoCapture(video_path)
|
||
if not cap.isOpened():
|
||
logger.error(f"无法打开视频: {video_path}")
|
||
return None
|
||
|
||
# 读取首帧
|
||
ret, frame = cap.read()
|
||
if not ret:
|
||
logger.error("无法读取视频帧")
|
||
cap.release()
|
||
return None
|
||
|
||
# 保存首帧为图片
|
||
try:
|
||
cv2.imwrite(output_path, frame)
|
||
logger.info(f"首帧已保存为: {output_path}")
|
||
except Exception as e:
|
||
logger.error(f"保存首帧图片失败: {e}")
|
||
cap.release()
|
||
return None
|
||
|
||
# 释放资源
|
||
cap.release()
|
||
return os.path.abspath(output_path)
|
||
|
||
except Exception as e:
|
||
logger.error(f"提取视频首帧时出错: {e}")
|
||
return None
|
||
finally:
|
||
cap.release()
|
||
|
||
|
||
def _get_first_frame_bytes(video_bytes, output_path):
|
||
"""
|
||
提取视频的第一帧并保存为图片
|
||
:param video_bytes: 视频文件流
|
||
:param output_path: 输出图片路径
|
||
:return: 输出图片的绝对路径，如果失败则返回None
|
||
"""
|
||
try:
|
||
logger.info(f"开始提取视频流首帧")
|
||
# 创建临时文件
|
||
with tempfile.NamedTemporaryFile(suffix=".mp4", delete=False) as temp_file:
|
||
# 将字节流写入临时文件
|
||
temp_file.write(video_bytes)
|
||
temp_file_path = temp_file.name # 获取临时文件路径
|
||
# 打开视频文件
|
||
return _get_first_frame(temp_file_path, output_path)
|
||
except Exception as e:
|
||
logger.error(f"提取视频首帧时出错: {e}")
|
||
return None
|