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README: make it clear that libav is optional
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@ -104,7 +104,7 @@ that fine library.
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* A C11 and a C++14 compiler
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* A C11 and a C++14 compiler
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* CMake 3.13.0+
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* CMake 3.13.0+
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* From NCURSES: terminfo 6.1+
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* From NCURSES: terminfo 6.1+
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* From FFMpeg: libswscale 5.0+, libavformat 57.0+, libavutil 56.0+
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* (OPTIONAL) From FFMpeg: libswscale 5.0+, libavformat 57.0+, libavutil 56.0+
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### Building
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### Building
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@ -1412,7 +1412,8 @@ cell_set_bg_default(cell* c){
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Media decoding and scaling is handled by libAV from FFmpeg, resulting in a
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Media decoding and scaling is handled by libAV from FFmpeg, resulting in a
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`notcurses_visual` object. This object generates frames, each one corresponding
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`notcurses_visual` object. This object generates frames, each one corresponding
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to a renderable scene on the associated `ncplane`.
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to a renderable scene on the associated `ncplane`. If notcurses is built without
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FFMpeg support, these functions will all return error.
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```c
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```c
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// Open a visual (image or video), associating it with the specified ncplane.
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// Open a visual (image or video), associating it with the specified ncplane.
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