Commit 0e075b4d authored by Andreas Frisch's avatar Andreas Frisch Committed by Andreas Frisch

mpegtsmux: Don't assume English for ISO-639 language descriptor

Previously, "en" (should have actually been "eng") was assumed
for the ISO-639 language descriptor if no language was explicitely given.
Neither ETSI EN 300 468 nor ATSC A/52 mandate for a language descriptor,
so we should simply not set it, if it's unknown.

Part-of: <!1386>
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