Conversion packages

conversion	program
raster transcoding (raster to raster)	imagemagick
3d transcoding (3d to 3d)	aqsis frontend (k3d)
audio transcoding (audio to audio)	sox
video transcoding (video to video)	mplayer
text transcoding (text to text)	jodconverter (opendocument, txt, html to opendocument, txt, html) ghostscript (txt/html to pdf) poppler-utils (pdf to txt, abiword or html)
tracing (vector to raster)	autotrace
pixel values to sound samples (raster to audio)	enscribe
inserting frame into video (raster to video)	imagemagick and mplayer
ocr (raster to text)	gocr
ascii art (raster to text)	aalib
extract text from geometry file (3d to text)	????????????
samples to pixels (audio to raster)	baudline? (don't know if it works in cli only)
waveform plotting (audio to raster)	gnuplot
speech recognition (audio to text)	sphinx? (needs feedback)
text to speech (text to audio)	espeak
insert text in geometry file (text to 3d)	aqsis and aqsis frontend (k3d)
insert text in vector file (text to vector)	imagemagick
text rendering in raster file (text to raster)	imagemagick
rastering (vector to raster)	imagemagick
extract frame from video (video to raster)	mplayer
extract audio track from video (video to audio)	mplayer? (unsure about this)