from: https://blog.csdn.net/weiyuefei/article/details/64125208
ffmpeg循环推流方法
You should be able to use the -stream_loop -1 flag before the input (-i):
ffmpeg -threads 2 -re -fflags +genpts -stream_loop -1 -i ./test.mp4 -c copy ./test.m3u8
The -fflags +genpts will regenerate the pts timestamps so it loops smoothly, otherwise the time sequence will be incorrect as it loops.
FFmpeg >= 2.8.4 is required in this case.
参考
https://www.v2ex.com/t/264280
http://video.stackexchange.com/questions/12905/repeat-loop-input-video-with-ffmpeg
http://stackoverflow.com/questions/30846719/infinite-stream-from-a-video-file-in-a-loop
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