vpxenc: Warns if the first buffer has a timestamp of 0
The following discussion from !2405 (merged) should be addressed:
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@slomo started a discussion: This causes a warning now on the first frame in basically every pipeline
GST_DEBUG=3 gst-launch-1.0 videotestsrc ! vp8enc ! fakesink 0:00:00.021403376 2359781 0x7febbc000b90 WARN vpxenc gstvpxenc.c:2290:gst_vpx_enc_handle_frame:<vp8enc0> decreasing pts 0:00:00.000000000 previous buffer was 0:00:00.000000000 enforce increasing pts
CC @gdesmott