Sending refresh DTX packets every 400 ms independently of the encoded frame size.

Signed-off-by: Felicia Lim <flim@google.com>
4 jobs for master in 5 minutes and 41 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed autoconf #11426
docker

00:05:20

passed cmake #11427
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00:02:39

passed meson #11428
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00:02:54

 
  Test
passed whitespace #11429
docker

00:00:06