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README
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1993-07-02
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Media Vision Pro Movie Spectrum DOS VCR Program GaryL:07/02/93
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Documentation of DOS VCR features and controls, as well as warnings
about use. This VCR application uses the Motive library developed
by Media Vision for DOS playback of AVI movies.
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VCR currently requires Media Vision Pro Audio Spectrum or Thunderboard/
SoundBlaster v2.0 hardware and a VGA card, preferably one using the
Cirrus Logic 542X chip or supporting the VESA VGA BIOS Extension
(VBE v1.2). VCR plays back movies recorded in AVI format in one of
the following video formats:
raw 8/16/24-bit video
MS 8-bit RLE video (<64K per uncompressed frame)
MS Video 1 (Media Vision ALF) 8/16-bit (<64K per uncompressed frame)
VCR plays back movies recorded with 8 or 16-bit audio at 11kHz, 22kHz,
and 44kHz, in mono or stereo. Note that video playback quality will
be severely degraded at the higher data rates.
VCR can play off of a CDROM, provided that the file is compressed for
a data rate of <=150K/sec.
To run VCR, type VCR, followed by the filename:
VCR f:\space\8_bit_90\voyager.avi
VCR will immediately start playing the movie. While playing, there are
several VCR-like commands available on the keypad.
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[Enter] Toggle play/stop of movie.
[Home]
Stop playing and rewind movie to beginning.
[End]
Stop playing and fast forward movie to end.
[PgUp]
Frame step one frame backward.
[PgDn]
Frame step one frame forward.
[LeftArrow]
Cue movie backward 15 frames.
[RightArrow]
Cue movie forward 15 frames.
[Esc]
Stop movie and exit.
[/]
Toggle full screen/dinky window mode on Cirrus 542X chips.
[*] Toggle between normal and 2x playback. Note that sustained
2x playback may cause audio breakup and/or severely degraded
playback.
[-] Decrease volume 10%.
[+] Decrease volume 10%.
[Tab] Increase playback rate. 1x and 2x playback will have audio,
higher rates will shut off audio.
[Shift][Tab] Decrease playback rate. 1x and 2x playback will have audio,
higher rates will shut off audio. This can be used to play in
reverse also.
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In the file VCR.INI there are a number of optional variables which you
can set and modify to improve the image quality of VCR. Many of these
variables do the same things as controls in the Video Source dialog. Some
of these numbers are expressed in hexadecimal, others in decimal. The
range of valid values is given for many variables. Be very careful when
modifying these variables. Improperly modifying them can cause VCR to
stop viewing or recording audio or video.
Name Hex/dec Description
==== ======= =================================================
[video]
Interrupt (d) Interrupt number. Should be 2,3,5,7,10,11,12, or 15
MemoryBase (h) Memory address. Default is C800
PortBase (h) IO port number. Default is 250
VideoCable (d) Which video input to use. 0=composite, 1=S-video
FrameRate (d) What frame rate to use during capture.
Hue (h) Hue (00 to FF)
Color (h) Color (00 to FF)
Contrast (h) Contrast (00 to FF)
Red (h) Red (00 to FF)
Green (h) Green (00 to FF)
Blue (h) Blue (00 to FF)
HorzStart (h) Horizontal start (-97 to +97)
[audio]
SampleRate (d) Audio sample rate
NumChannels (d) 1=mono, 2=stereo
BitsPerSample (d) 8=8-bits/sample, 16=16-bits/sample
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