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Thiago Santos authored
When switching to a new chain it might be that this new chain is not yet ready to be exposed so check it before exposing. Can happen with mpegts that might delay adding pads or pushing data until it has found the PMT/PAT/PCR and that may take a while depending on the stream. It happened frequently with HLS: http://vevoplaylist-live.hls.adaptive.level3.net/vevo/ch1/appleman.m3u8
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