python ffmpeg任意提取視頻幀的方法
環(huán)境準(zhǔn)備
1、安裝 FFmpeg
2、安裝 ffmpeg-python
pip3 install ffmpeg-python
3、【可選】安裝 opencv-python
pip3 install opencv-python
4、【可選】安裝 numpy
pip3 install numpy
視頻幀提取
準(zhǔn)備視頻素材
抖音視頻素材下載:https://anoyi.com/dy/top
基于視頻幀數(shù)提取任意一幀
import ffmpeg import numpy import cv2 import sys import random def read_frame_as_jpeg(in_file, frame_num): """ 指定幀數(shù)讀取任意幀 """ 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): """ 獲取視頻基本信息 """ 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/拜無憂.mp4' video_info = get_video_info(file_path) total_frames = int(video_info['nb_frames']) print('總幀數(shù):' + str(total_frames)) random_frame = random.randint(1, total_frames) print('隨機(jī)幀:' + 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()
基于時間提取任意一幀
import ffmpeg import numpy import cv2 import sys import random def read_frame_by_time(in_file, time): """ 指定時間節(jié)點讀取任意幀 """ 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): """ 獲取視頻基本信息 """ 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/拜無憂.mp4' video_info = get_video_info(file_path) total_duration = video_info['duration'] print('總時間:' + total_duration + 's') random_time = random.randint(1, int(float(total_duration)) - 1) + random.random() print('隨機(jī)時間:' + 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()
相關(guān)資料
https://github.com/kkroening/ffmpeg-python/tree/master/examples
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