97 lines
3.2 KiB
Plaintext
97 lines
3.2 KiB
Plaintext
CMIF video tools
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================
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This directory contains Python and C programs to manipulate files
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containing digitized video in the "CMIF video format".
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History
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-------
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We started this in October 1991, when we had a large framegrabber
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board on loan from SGI for a few weeks: we developed a movie recording
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program (camcorder.py) and added numerous features, including still
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frame capture and synchronous sound recording using a second machine
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(the machine holding the framegrabber board didn't have audio).
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During the following months, when we started using and processing the
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recorded film fragments, the "CMIF video format" was revised several
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times, and we eventually created an object-oriented interface for
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reading and writing various incarnations of these files, called VFile.
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(This module is also used by our flagship application, the CMIF
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editor, not in this directory but in /ufs/guido/mm/.)
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When we got our own Indigo entry-level video board (in June 1992) and
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a version of the Irix video library that supported capturing PAL
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format (in August 1992), Sjoerd added an interface to the video
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library to Python (sv) and Guido wrote Vrec.py (based upon a still
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frame grabber by Sjoerd, in turn based upon SGI demo code in C) to
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record a movie using it. Vrec was soon followed by modernized
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versions of the other programs (Vinfo, Vplay, Vtime) and an
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interactive editor (Vedit). Finally, VFile was rewritten for more
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modularity, functionality and robustness, and various other tools were
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added as needed. Also, new options were added to existing tools, and
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several new video file formats were added.
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Guido van Rossum
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Jack Jansen
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Sjoerd Mullender
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Overview of files
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-----------------
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cmif-film.ms description of the CMIF video file format (more than a
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little out of date -- read the source for VFile for
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more info about new file formats)
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These are programs with a command line interface:
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Vrec.py record video movies using the Indigo video library and
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board
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Vplay.py play video movies
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Vinfo.py show statistics on movies
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Vtime.py Copy a video file, manipulating the time codes (e.g.
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faster/slower, or regenerate time codes, or drop
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frames too close apart)
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Vcopy.py selectively write frames from one movie file to another
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usage: Vcopy [-t type] [-m treshold] [-a] infile outfile
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commands: 'n' gets next frame; 'w' writes current frame
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Vmkjpeg.py compress an rgb or grey video file to jpeg[grey] format
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Vunjpeg.py expand a jpeg[grey] video file to rgb or grey format
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Vfix.py truncate the scan line width of a video file to
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a multiple of 4 ('grey' images only)
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Vedit.py interactive video editing program (uses the FORMS library)
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Vsend.py unicast or multicast live video as UDP packets
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Vreceive.py receive transmissions from Vsend
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Vaddcache.py add a "cached index" to a video file, for faster playing
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Vrecb.py like Vrec.py but uses "burst capture" -- somewhat specialized
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These modules and files are used by the above programs:
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VFile.py classes that read and write CMIF video files
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Viewer.py two viewer classes used by Vedit
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LiveVideoIn.py live video input class, used by Vsend
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LiveVideoOut.py live video output class, used by Vsend and Vreceive
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senddefs.py Defaults shared by Vsend and Vreceice
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VeditForm.fd FORMS' fdesign definition for Vedit's form
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