Revision as of 09:02, 13 February 2015

Media Commons

Convert Image to Pyramidal TIFF

Example:

 gdal_translate -co "TILED=YES" original.tif output.tif
 gdaladdo -r average output.tif 2 4 8 16 32 64

The first command will tile the image which helps with performance. The second will add overviews: 2 4 8 16 32 64 (each number is a split level (so this will create 6 levels - you can create more but making a tile smaller than 256 by 256 is pointless). The final image in the example will be output.tif.

To make the image show up in the menu, copy it to /home/demo/demo_content.

Convert high resolution video for CGLX player

Converting high resolution video into CGLX renderable OSG tile clusters with XML metadata for playback under MediaCommons:

Script requires FFMPEG and Python 2.7

Usage: sh clustertile.sh [INPUT_DIR_FILE] [OUTPUT_DIR] [OUTPUT_PREFIX] [WIDTH] [HEIGHT] [COL] [ROW]

Example: user$> sh clustertile.sh /foo/foo.mp4 /bar test 3840 2160 8 8

Depending on the source resolution and level of subdivision FFMPEG crop streaming can be fast or take some time. Transcoding your source content to H264 before running the clustertile script can speed things up significantly.

#!/bin/bash
# Rev021115
# Nathan Wade
#
# This script creates cluster optimized OpenSceneGraph quad tiles with metadata 
# from a single HD video source for synchronous playback on MediaCommons CGLX video walls.  
#
# http://sc13.supercomputing.org/sites/default/files/WorkshopsArchive/pdfs/wp154s1.pdf
# http://vis.ucsd.edu/~cglx/
#
# required: FFMPEG, Python 2.7
# usage: sh scriptname INPUT_DIR_FILE OUTPUT_DIR OUTPUT_PREFIX WIDTH HEIGHT COL ROW

echo "INPUT_DIR_FILE: $1"
#ffmpeg -i $1
echo "OUTPUT_DIR: $2"
echo "OUTPUT_PREFIX: $3"
echo "WIDTH: $4"
echo "HEIGHT: $5"
echo "COL: $6"
echo "ROW: $7"

mkdir $2/$3/
touch $2/$3.xml


PYTHON_ARG="$1 $2 $3 $4 $5 $6 $7" python - <<END

import os
import subprocess as sp

FMPEG_BIN = "ffmpeg" # unix, os x
FFMPEG_BIN = "ffmpeg.exe" # ms windows

XML = open('$2/$3.xml','w')
XML.write("<?xml version=\"1.0\"?>\n<RenderableDataObject type=\"tiled_video\">\n")

cW = $4/$6
cH = $5/$7
cRow = 0
cCol = 0

for col in range(0,$6):
	for row in range(0,$7):
		XML.write('    <tile path=\"$2/$3/%i-%i.mp4\" column=\"%i\" row=\"%i\" />\n'%(cCol, cRow, cCol, $7-cRow-1))
        
        #ffmpeg -i in.mp4 -filter:v "crop=out_w:out_h:x:y" [-an | -c:a copy] out.mp4 -y
		command = [ FMPEG_BIN,
            '-i', '$1',
            '-filter:v', 'crop=%i:%i:%i:%i'%(cW,cH, cW*cCol, cH*cRow),
            '-an','$2/$3/%i-%i.mp4'%(cCol, cRow),
            '-y']
		pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8)

		cRow+=1
		
	cRow = 0
	cCol+=1

XML.write("</RenderableDataObject>\n")
XML.close
END

exit