python如何调用ffmpeg

Posted 2023-03-14

python如何调用ffmpeg？去ffmpeg官网下载编译好的avcodec-57 dll、avutil-55 dll、swresample-2 dll，准备好了C语言写出的库。相关推荐：《

参考技术A 基本使用如下：
import av

container = av.open(path_to_video)

for frame in container.decode(video=0):
frame.to_image().save('frame-%04d.jpg' % frame.index)
保存关键帧：
import av
import av.datasets

content = av.datasets.curated('pexels/time-lapse-video-of-night-sky-857195.mp4')
with av.open(content) as container:
# Signal that we only want to look at keyframes.
stream = container.streams.video[0]
stream.codec_context.skip_frame = 'NONKEY'

for frame in container.decode(stream):

print(frame)

# We use `frame.pts` as `frame.index` won't make must sense with the `skip_frame`.
frame.to_image().save(
'night-sky.:04d.jpg'.format(frame.pts),
quality=80,
)