如何使用Python和FFmpeg高效提取视频中的任意帧？

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环境准备+1、安装FFmpeg+音视频工具+FFmpeg+简易安装文档+2、安装ffmpeg-python+pip3 install ffmpeg-python+3、[可选]安装opencv-python+pip3 install opencv-python+4、[可选]安装numpy+pip3 install numpy+视频

环境准备

1、安装 FFmpeg

音/视频工具 FFmpeg 简易安装文档

2、安装 ffmpeg-python

pip3 install ffmpeg-python

3、安装 opencv-python

pip3 install opencv-python

4、安装 numpy

pip3 install numpy

视频帧提取

准备视频素材

抖音视频素材下载：anoyi.com/dy/top

基于视频帧数提取任意一帧

import ffmpeg import numpy import cv2 import sys import random def read_frame_as_jpeg(in_file, frame_num): """ 指定帧数读取任意帧 """ out, err = ( ffmpeg.input(in_file) .filter('select', 'gte(n,{})'.format(frame_num)) .output('pipe:', vframes=1, format='image2', vcodec='mjpeg') .run(capture_stdout=True) ) return out def get_video_info(in_file): """ 获取视频基本信息 """ try: probe = ffmpeg.probe(in_file) video_stream = next((stream for stream in probe['streams'] if stream['codec_type'] == 'video'), None) if video_stream is None: print('No video stream found', file=sys.stderr) sys.exit(1) return video_stream except ffmpeg.Error as err: print(str(err.stderr, encoding='utf8')) sys.exit(1) if __name__ == '__main__': file_path = '/Users/admin/Downloads/拜无忧.mp4' video_info = get_video_info(file_path) total_frames = int(video_info['nb_frames']) print('总帧数：' + str(total_frames)) random_frame = random.randint(1, total_frames) print('随机帧：' + str(random_frame)) out = read_frame_as_jpeg(file_path, random_frame) image_array = numpy.asarray(bytearray(out), dtype="uint8") image = cv2.imdecode(image_array, cv2.IMREAD_COLOR) cv2.imshow('frame', image) cv2.waitKey()

基于时间提取任意一帧

import ffmpeg import numpy import cv2 import sys import random def read_frame_by_time(in_file, time): """ 指定时间节点读取任意帧 """ out, err = ( ffmpeg.input(in_file, ss=time) .output('pipe:', vframes=1, format='image2', vcodec='mjpeg') .run(capture_stdout=True) ) return out def get_video_info(in_file): """ 获取视频基本信息 """ try: probe = ffmpeg.probe(in_file) video_stream = next((stream for stream in probe['streams'] if stream['codec_type'] == 'video'), None) if video_stream is None: print('No video stream found', file=sys.stderr) sys.exit(1) return video_stream except ffmpeg.Error as err: print(str(err.stderr, encoding='utf8')) sys.exit(1) if __name__ == '__main__': file_path = '/Users/admin/Downloads/拜无忧.mp4' video_info = get_video_info(file_path) total_duration = video_info['duration'] print('总时间：' + total_duration + 's') random_time = random.randint(1, int(float(total_duration)) - 1) + random.random() print('随机时间：' + str(random_time) + 's') out = read_frame_by_time(file_path, random_time) image_array = numpy.asarray(bytearray(out), dtype="uint8") image = cv2.imdecode(image_array, cv2.IMREAD_COLOR) cv2.imshow('frame', image) cv2.waitKey()

相关资料
github.com/kkroening/ffmpeg-python/tree/master/examples

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