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% notcurses-view(1)
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% nick black <nickblack@linux.com>
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% v1.6.12
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# NAME
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notcurses-view - Render images and video to a terminal
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# SYNOPSIS
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**notcurses-view** [**-h|--help**] [**-d delaymult**] [**-l loglevel**] [**-s scalemode**] [**-k**] files
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# DESCRIPTION
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**notcurses-view** uses a multimedian-enabled notcurses to render images
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and videos to a terminal. Media will be scaled to the terminal's size.
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# OPTIONS
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**-d delaymult**: Apply a rational multiplier to the framerate.
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**-l loglevel**: Log everything (high log level) or nothing (log level 0) to stderr.
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**-s scalemode**: Scaling mode, one of **none**, **scale**, or **stretch**.
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**-m margins**: Define rendering margins (see below).
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**-k**: Inhibit use of the alternate screen. Necessary if you want the output left on your terminal after the program exits.
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files: Select which files to render, and what order to render them in.
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Fully general ncvisual layer (#647)
This represents an essentially complete rewrite of ncvisual and associated code. It had two major goals:
Improve the ncvisual API based off lessons learned, pursuant to the upcoming API freeze. In particular, I wanted to:
decouple ncvisuals from ncplanes. It should be possible to render a ncvisual to multiple planes, with different scaling each time. It should be possible to create an ncvisual without a plane, etc.
normalize the various ways of constructing an ncvisual -- file, memory, plane, etc.
Support multiple blitters, from 7-bit ASCII to Sixel. This required writing the blitters in several cases, and they're not yet in their final implementations (but the API is fine)
I have not yet unified Plots and Visuals, and might not, given that the Plot code works fine. We could at this point implement Plots in terms of Visuals, though -- the blitter backend range has been unified. Sixel is not yet implemented, though it is listed.
There is a new POC tool, blitter. It renders its arguments using all possible blitter+scaling combinations. Another new POC, resize, displays its argument, then resizes it to the screen size and displays that, explicitly making use of ncvisual_resize() rather than a scaling parameter to ncvisual_render().
This also eliminates some memory leaks and bugs we were seeing in trunk, and brings in Sixel scaffolding.
The C++ wrapper will also need patching back up; I cut most of it down while wrestling with this crap, urk.
Closes #638, #562, and #622.
4 years ago
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Default margins are all 0 and default scaling is **stretch**. The full
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rendering area will thus be used. Using **-m**, margins can be supplied.
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Provide a single number to set all four margins to the same value, or four
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comma-delimited values for the top, right, bottom, and left margins
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respectively. Negative margins are illegal.
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Scaling mode **stretch** resizes the object to match the target rendering
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area exactly. **scale** resizes the object so that the longer edge of the
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rendering area is matched exactly, and the other edge is changed to
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maintain aspect ratio. **none** uses the original image size.
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Blitters can be selected by pressing '0' through '8'. **NCBLIT_DEFAULT**
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corresponds to '0'. The various blitters are described in
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**notcurses_visual**.
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A video can be paused with space. Press space (or any other valid control)
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to unpause.
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# NOTES
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Optimal display requires a terminal advertising the **rgb** terminfo(5)
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capability, or that the environment variable **COLORTERM** is defined to
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**24bit** (and that the terminal honors this variable), along with a
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fixed-width font with good coverage of the Unicode Block Drawing Characters.
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# SEE ALSO
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**notcurses(3)**,
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**notcurses_visual(3)**,
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**terminfo(5)**,
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**unicode(7)**
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