The example of FLV Multi player uses two videos: "KyodaiNoGilga" and "Garrison". The button in the left lower corner shows the selection area, but "Garrison" is not there and cannot be selected.
Fixed in current git (bff97ca6943329fc42fef894009c9304c0b8d22e) The player doesn't show buffering information correctly, but that's bug #16568
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