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diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst index 871561cde3..347a6bbcc4 100644 --- a/DOCS/man/options.rst +++ b/DOCS/man/options.rst @@ -49,6 +49,35 @@ Track Selection ``--aid=no`` or ``--audio=no`` or ``--no-audio`` disables audio playback. (The latter variant does not work with the client API.) + .. note:: + + The track selection options (``--aid`` but also ``--sid`` and the + others) sometimes expose behavior that may appear strange. Also, the + behavior tends to change around with each mpv release. + + The track selection properties will return the option value outside of + playback (as expected), but during playbac, the affective track + selection is returned. For example, with ``--aid=auto``, the ``aid`` + property will suddenly return ``2`` after playback initialization + (assuming the file has at least 2 audio tracks, and the second is the + default). + + At mpv 0.32.0 (and some releases before), if you passed a track value + for which a corresponding track didn't exist (e.g. ``--aid=2`` and there + was only 1 audio track), the ``aid`` property returned ``no``. However if + another audio track was added during playback, and you tried to set the + ``aid`` property to ``2``, nothing happened, because the ``aid`` option + still had the value ``2``, and writing the same value has no effect. + + With mpv 0.33.0, the behavior was changed. Now track selection options + are reset to ``auto`` at playback initialization, if the option had + tries to select a track that does not exist. The same is done if the + track exists, but fails to initialize. The consequence is that unlike + before mpv 0.33.0, the user's track selection parameters are clobbered + in certain situations. + + Most likely this is not the end. + ``--sid=<ID|auto|no>`` Display the subtitle stream specified by ``<ID>``. ``auto`` selects the default, ``no`` disables subtitles. |