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h264parse: In-band sps/pps update if only codec_data differs in src caps

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:h264parse-resend-codec-data into master

Initially the case "only codec_data is different" was addressed in https://bugzilla.gnome.org/show_bug.cgi?id=705333 in order for unusual bitstreams to be handled. That's the case where sps and pps are placed in bitstream. When sps/pps are signalled only via caps by upstream, however, the updated codec_data is mandatory for decoder and therefore we shouldn't ignore them.

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