我正试图从本地付费电话中获取一张屏幕截图，以便使用图像识别来了解它的拥塞程度。每次从AWS Lambda运行命令时，我都试图使用ffmpeg来提取一张屏幕快照。我的问题是，我无法从m3u8文件中提取任何类型的图像。
http://roads.mk/315/video-kameri
当我打开其中一个摄像头时，直播流显示正常，但当我右键点击复制地址时，我会得到一个斑点链接
blob：http://roads.mk/cb301be0-3e70-4d09-af2b-3f3d44ee8f4f
幸运的是，在该网站的移动版上，一旦点击链接，它就会立即下载m3u8文件。一旦使用命令放入ffmpeg
ffmpeg -i "gradsko_1.m3u8" -vf fps=1/3600 grad%04d.jpg
我收到的回复
[hls @ 000000ce3d26d700] Skip ('#EXT-X-VERSION:3')
[hls @ 000000ce3d26d700] Opening 'gradsko_1-586008.ts' for reading
[hls @ 000000ce3d26d700] Failed to open segment 586008 of playlist 0
[hls @ 000000ce3d26d700] Opening 'gradsko_1-586009.ts' for reading
[hls @ 000000ce3d26d700] Failed to open segment 586009 of playlist 0
[hls @ 000000ce3d26d700] Opening 'gradsko_1-586010.ts' for reading
[hls @ 000000ce3d26d700] Failed to open segment 586010 of playlist 0
[hls @ 000000ce3d26d700] Skip ('#EXT-X-VERSION:3')
Last message repeated 3 times
[hls @ 000000ce3d26d700] Error when loading first segment 'gradsko_1-585991.ts'
gradsko_1.m3u8: Immediate exit requested
Exiting normally, received signal 2.```
From what I could tell, the stream seems to be protected.
Any way to get inside this? I would only need a single screenshot with no audio since the program would run once an hour/on command for a very general estimate. I'm just starting out with ffmpeg so any tips would be greatly appreciated.
这对我有效：ffmpeg -i http://streaming1.neotel.net.mk:8080/hls/romanovce_3.m3u8 -vframes 1 -q:v 2 output.jpg
仅供参考：如果你首先将播放列表(m3u8(下载到本地驱动器，然后尝试使用它，你会遇到两个问题。
- 播放列表中的URL现在是无效的，因为它们是相对于服务器的
- 播放列表很快就过时了，因为这是实时的，服务器只保留了几个片段