preserve GoPro telemetry in output MP4 files


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Beginning with the Hero5, GoPro includes "GPMF" telemetry in their MP4 files. There is some really neat stuff, including GPS-derived time-date and location information.

However, VideoReDo obliterates this in any output files it generates, leaving only the video and audio.

Information on GPMF, including a parsing library, is here:

and there are sample MP4 files included in the "samples" subdirectory.

If you compile GoPro's demo code ("demo" subdirectory), or use the nag-ware (likely based on top of the library code in github), you'll see that telemetry exists in these files, but any VideoReDo generated subset or joining loses this data.
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