if FFmeg.exe's output has more than one stream of the same kind, such as audo 
or subtitle,  there is not  the default one. 
Especially‍ if there is no the default subtitle, most of the players will not 
display any subtitle. FFproble.exe can show if there is the deflaut stream of 
every stream.
FFprobe   -show_streams INPUT
 
[STREAM]
...
DISPOSITION:default=0
...
[/STREAM]

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