This directory contains Python and C code for video stuff.
History:
We started this in October 1991, when we had a large framegrabber
board on loan from SGI for a few weeks.
Later, when we started processing the recorded film fragments, the
"CMIF video format" was revised several times, and we finally created
an object-oriented interface for reading and writing various
incarnations of these files, called VFile.
When we finally got our own Indigo entry-level video board (in June
1992) and a version of the Irix video library that supported capturing
PAL format (August 1992) Sjoerd added an interface to the video
library to Python (sv) and Guido wrote makemovie.py (based upon a
still frame grabber by Sjoerd) to record a movie using it.
--Guido, Jack and Sjoerd
cam.py network real-time tv broadcast; see tv.py
usage: cam [packfactor [host]]
specifying 'all' for host broadcasts
camcorder.py record video movies or make snapshots (in movie format)
usage: camcorder [-c] [-a audiohost [-s]] [-p pf] [moviefile]
-c color (equivalent to -p 0)
-a audiohost syncaudio is running on audiohost
-s start syncaudio (on audiohost)
-p packfactor packfactor (default 2; 0 records color)
moviefile (default film.video)
keyboard commands:
s stop grabbing (single step if already stopped)
c continuous grabbing
r start recording
p pause recording (record single frame if paused)
ESC quit
colorsys.py color conversions, used by video
makemovie.py record video movies using the Indigo video library and
board
statit.py various statistics operations on movie files
syncaudio.py record audio synchronized with camcorder -a
usage: syncaudio videohost soundfile
soundfile format: 16 bits/sample, 16000 samples/sec, 1 channel
(actually, you'd better set the sampling rate to 16000
with the audio panel)
tv.py receiver for transmissions from cam.py
vcopy.py selectively write frames from one movie file to another
usage: vcopy infile outfile
commands: 'n' gets next frame; 'w' writes current frame
video.py player for movies recorded by camcorder.py
usage: video [-l] [-p pf] [-m mag] [-F]
[moviefile [soundfile [skipbytes]]]
-p pf override packfactor (to zoom)
-l looping -- restart movie when done
-m mag magnification
-F run at max speed
moviefile default is film.video
soundfile default is none (no sound)
skipbytes byte offset in soundfile where sound starts
Vplay.py same but using VFile.py
vinfo.py print summary of movie file(s)
usage: vinfo [-d] moviefile ...
-d print delta times (default: print abs times)
Vinfo.py same but using VFile.py
vpregs.py definition of VP registers
vtime.py virtual time module imported by syncaudio.py and camcorder.py
These are C programs, either for efficiency or because they need to
link with a C library.
squash.c make a movie smaller by averaging pixels
usage: squash factor [bits] <moviefile >newmoviefile
factor x and y compression factor
bits #bits left per sample in result (default 8)
squash2.c make a movie smaller by dropping pixels
usage: squash2 factor <moviefile >newmoviefile
factor x and y compression factor
tomono.c like squash2 but outputs a monochrome movie
v2i.c convert the first frame of a movie file to SGI .rgb format
link with -limage
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