motivation
Can be used to fetch frames from a video and create mosaics out of them for better storage and distribution.
Possible usage scenarios:
- show preview in video slider
- auxiliary imagery for non linear editing of videos
requirements
-
Requires graphicsmagick to be installed:
sudo apt-get install graphicsmagick
-
Requires avconv to be installed with x264 support (if reading h.264 videos) Read how to do it here.
examples
The following examples are available in samples
And the video used it them is this one:
do mosaic magic
Source code:
var au = ;au;
Callback result is:
mosaicDimensions: 870 984 frameDimensions: 145 82 strategy: 'square' outFile: 'mosaics/jTE4TOJANeatDmQi341m.jpg' grid: 6 12 n: 68 videoDuration: 6641 videoDimensions: 580 326
and the following mosaic image:
Note: The square
strategy displayed above is the most appropriate for humans to inspect the result.
If you're scripting a preview slider based on CSS properties horizontal
or vertical
strategies
are better suited for such purpose. They compose the mosaic in a single row/column respectively.
get metadata
Source code:
var au = ;au;
Callback result is:
duration: '00:01:06.41' durationSecs: 6641 vCodec: 'h264 (Constrained Baseline)' vDetails: 'Video: h264 (Constrained Baseline), yuv420p, 580x326 [PAR 1:1 DAR 290:163], 694 kb/s, 24 fps, 24 tbr, 24 tbn, 48 tbc' dimensions: 580 326 aCodec: 'aac' aDetails: 'Audio: aac, 48000 Hz, stereo, s16, 127 kb/s'
usage
Check API.
Usage examples in bin/* command line utilities and tests directory.
changelog
Check LOG.