We have not received any report similar to this issue you're experiencing. Sound's like you casting from a mobile device. Make sure that the app is up to date and try clearing the cache or restarting the device. Let us know if that fixes it.
@TeamYouTube we have no sound on videos that are chromecasted from several mobile devices, is this a known issue?
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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