Add filename to --dump-json

[Rudloff]

Hello,

Would it be possible to add the output of --get-filename to --dump-json ?

Regards,

[phihag]

Added, you can use _filename. As the underscore indicates, this is a hidden property though, we reserve the right to remove it someday.

[phihag]

Oh, maybe I should elaborate why _filename has been made a hidden property in the first place: The filename can depend on a couple of things such as filesystem limits or system character set. This, and purely semantic considerations, make it separate from the extracted information about a video.