errorignore: Added convert-error signal
The convert-error signal is emitted whenever we get a GstFlowReturn other than GST_FLOW_OK. The handler can then decide what to convert that into - for instance, return the same GstFlowReturn to not convert it. The default handler will act according to the ignore-error, ignore-notlinked, ignore-notnegotiated and convert-to properties. If a handler is connected, these properties are ignored.
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