python 使用ffmpeg提取任意视频帧

1、安装 ffmpeg-python
pip3 install ffmpeg-python

基于视频帧数提取任意一帧

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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

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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()

参考：https://www.jianshu.com/p/4a678bffb12b