[FFmpeg-user] Extra streams in gopro videos - how do I examine?

[Carl Eugen Hoyos]

Jesper Taxbøl <jesper <at> taxboel.dk> writes:

> I am curious to find out what the two extra streams in my 
> GoPro Hero4 video are. How can I examine them and possibly 
> dump their contents in a textfile?

$ ffmpeg -i GP120116.MP4 -codec copy -map 0:3 -f rawvideo out
The other stream is nearly empty:
00000000  00 14 1c da                                       |....|
00000004

Carl Eugen