Add support for "Motion Photos"

GCam creates a small video around the shutter moment in mp4 format and appends it to the end of the jpeg file. They also add a few EXIF tags describing the video, example as follows;

Motion Photo                    : 1
Motion Photo Version            : 1
Motion Photo Presentation Timestamp Us: 1166199
Directory Item Mime             : image/jpeg
Directory Item Semantic         : Primary
Directory Item Length           : 0
Directory Item Padding          : 0
Directory Item Mime             : video/mp4
Directory Item Semantic         : MotionPhoto
Directory Item Length           : 3774306
Directory Item Padding          : 0

The video, in this case, is 3,774,306 bytes at the end of the file. The format of the video is an actual mp4 video. It can be copied into an mp4 file directly using “dd” as; dd bs={filelen-3774306} skip=1 if=file.MP.jpg of=file.MP.mp4

[thestinger]

The camera’s gallery would need to be able to display them.

[lbdroid]

This is an issue that I brought forward, you think its inappropriate to be slightly defensive when someone tries to side track it?