1FFMONGODB-SAVE-IMG(1)            Fawkes Manual           FFMONGODB-SAVE-IMG(1)
2
3
4

NAME

6       ffmongodb-save-imgs - Save PNG files from database images
7

SYNOPSIS

9       ffmongodb-save-imgs [-h] [-o dir] [-f] [-d database] -c <collection> items...
10

DESCRIPTION

12       This program connects to a local MongoDB database and extracts raw RGB
13       images from a collection (typically recorded via the mongodb-log
14       plugin), and stores them as a series of PNG images.
15

OPTIONS

17       -h
18           Show help instructions.
19
20       -o directory
21           Write PNG images to the given output directory.
22
23       -f
24           Use the filenames as stored in the database. If not given the
25           images will be saved as a numbered sequence of the form 00000001,
26           00000002 etc.
27
28       -d database
29           Name of the database to read from.
30
31       -c collection
32           Name of the collection to read from.
33
34       items
35           Timestamps and time ranges for which to extract the images.
36           Timestamps are given as the time since the epoch in milisecond
37           precision. If two timestamps are given concatenated by ".." they
38           are treated as start and end times of a time range.
39

VIDEO FROM AN IMAGE SEQUENCE

41       You can generate videos from an image sequence for example using a
42       command like this:
43
44       ffmpeg -r 24 -b:v 500000 -i openni-image-rgb-%08d.png video.mp4
45           Create video.mp4 with 24fps at a bit rate of 500kbit from images of
46           the given name pattern. Note that for older ffmpeg version the
47           bitrate must be specified with just -b.
48

EXAMPLES

50       ffmongodb-save-imgs -c openni_image_rgb 0..1355421345807
51           Extract all images until 1355421345807.
52

SEE ALSO

54       fawkes(8)
55

AUTHOR

57       Written by Tim Niemueller <niemueller@kbsg.rwth-aachen.de>
58

DOCUMENTATION

60       Documentation by Tim Niemueller <niemueller@kbsg.rwth-aachen.de>
61

FAWKES

63       Part of the Fawkes Robot Software Framework. Project website is at
64       http://www.fawkesrobotics.org
65
66
67
68Fawkes 1.0.1                      07/13/2018             FFMONGODB-SAVE-IMG(1)
Impressum