video - HTTP Range header without corrupting mp4 file -

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I want to preview the MP files from the HP server so that I want to request some of them different in each file Is encoding

Note: I can access any part of the file with the HTC Range header.

Thank you. / P>

I do this with FFmpeg 

  ffmpeg -ss 00: 01: 00 -i http://example.com/foo.mp4 -t 00:01:00 -c copy outfil.mp4

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