Merge commit 'fa1749dd'

* commit 'fa1749dd':
  vp9: split superframes in the filtering stage before actual decoding

This commit is a noop.

2017-04-24 20:45:04     @ubitux BBB: btw, do you think you can get the bsf thing this week or we should skip it to give you more time and go on with the merges?
2017-04-24 20:45:20     @BBB    I’m not sure I’ll finish it that soon
2017-04-24 20:45:26     @BBB    I’d skip it and leave it for later
2017-04-24 20:45:35     @BBB    I’ll do it, I promise, but I Can’t guarantee it’ll be done by $date
Merged-by: Clément Bœsch <u@pkh.me>

doc/libav-merge.txt

@@ -98,6 +98,7 @@ Stuff that didn't reach the codebase:
 - Removal of the custom atomic API (5cc0057f49, see http://ffmpeg.org/pipermail/ffmpeg-devel/2017-March/209003.html)
 - Read aac_adtstoasc extradata updates from packet side data on Matroska once mov and the bsf in question are fixed (See 13a211e632 and 5ef1959080)
 - new bistream reader (see http://ffmpeg.org/pipermail/ffmpeg-devel/2017-April/209609.html)
+- use of the bsf instead of our parser for vp9 superframes (see fa1749dd34)
 
 Collateral damage that needs work locally:
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