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DOCS: explain about DVD situation in man page.

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Explains libdvdnav vs libdvdread situation (as much as I know),
workarounds for bugs, and limitations of image-based subtitles.
(try #4)
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archenemies 2016-01-23 22:17:12 -08:00 committed by wm4
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DOCS/man/mpv.rst
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@ -381,6 +381,45 @@ file stops playing. If option ``--c`` is changed during playback of
``file2.mkv``, it is reset when advancing to ``file3.mkv``. This only affects
file-local options. The option ``--a`` is never reset here.
Playing DVDs
------------
DVDs can be played with the ``dvd://[title]`` syntax. The optional
title specifier is a number which selects between separate video
streams on the DVD. If no title is given (``dvd://``) then the longest
title is selected automatically by the library. This is usually what
you want. mpv does not support DVD menus.
DVDs which have been copied on to a hard drive or other mounted
filesystem (by e.g. the ``dvdbackup`` tool) are accommodated by
specifying the path to the local copy: ``--dvd-device=PATH``.
Alternatively, running ``mpv PATH`` should auto-detect a DVD directory
tree and play the longest title.
.. note::
mpv uses a different default DVD library than MPlayer. MPlayer
uses libdvdread by default, and mpv uses libdvdnav by default.
Both libraries are developed in parallel, but libdvdnav is
intended to support more sophisticated DVD features such as menus
and multi-angle playback. mpv uses libdvdnav for files specified
as either ``dvd://...`` or ``dvdnav://...``. To use libdvdread,
which will produce behavior more like MPlayer, specify
``dvdread://...`` instead. Some users have experienced problems
when using libdvdnav, in which playback gets stuck in a DVD menu
stream. These problems are reported to go away when auto-selecting
the title (``dvd://`` rather than ``dvd://1``) or when using
libdvdread (e.g. ``dvdread://0``).
DVDs use image-based subtitles. Image subtitles are implemented as
a bitmap video stream which can be superimposed over the main
movie. mpv's subtitle styling and positioning options and keyboard
shortcuts generally do not work with image-based subtitles.
Exceptions include options like ``--stretch-dvd-subs`` and
``--stretch-image-subs-to-screen``.
CONFIGURATION FILES
===================