Say I have an input file with several subtitles, one of them being
flagged "default" (say the 0:s:1 stream, that is the 2nd subtitle
stream). I am copying all of them: "-map 0:s -c:s copy"
Empirically I have found that:
* no option
-----> the default flag is unmodified
* "-disposition:s:2 default"
-----> the default flag is unmodified
* "-disposition:s -default"
-----> the default flag is set on the s:0 stream
* "-disposition:s -default -disposition:s:2 default"
-----> the default flag is set on the s:2 stream
* "-disposition:s -default -disposition:s:2 default"
-----> the default flag is set on the s:2 stream
* "default_mode passthrough"
-----> the default flag is unmodified
* "default_mode infer"
-----> the default flag is unmodified
* "default_mode infer_no_subs"
-----> the default flag is unmodified
* "default_mode infer -disposition:s -default"
-----> the default flag is set on the s:0 stream
* "default_mode infer_no_subs -disposition:s -default"
-----> the default flag is removed from all s: streams
* "default_mode passthrough -disposition:s -default"
-----> the default flag is removed from all s: streams
So, I know what to do depending on what I want on the output, but I do
not understand at all how these different options interact...
Any clue appreciated!
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