Trimming remote file

[VicenteFava]

ffmpeg -i http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_50mb.mp4 -ss 00:01:08 -t 00:01:18 -async 1 cut.mp4

Hello, The above command seems to do what I need (trim a remote video file and save the results locally). I need to do this on my iPhone but I could not use the library. The documentation is very obscure.

Can anyone help me? Thanks