[FFmpeg-trac] #5815(avcodec:reopened): vp8: auto-alt-ref does not work with transparency

[FFmpeg]

#5815: vp8: auto-alt-ref does not work with transparency
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             Reporter:               |                    Owner:
  MasterBlatter                      |                   Status:  reopened
                 Type:  defect       |                Component:  avcodec
             Priority:  normal       |               Resolution:
              Version:  git-master   |               Blocked By:
             Keywords:  libvpx       |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by MasterBlatter):

 Yep I wasn't getting this kind of artifacts on the first run (is a batch
 of encodes at many bitrates), but after even on it (maybe coz I was
 testing with a 1 minute file and I cutted them to 2s?), but only with
 those brga files, not with yuv files nor using libx264 libx265 or libvpx-
 vp9.

 I was no sure if it was an ffmpeg, an y4m decoder or a libvpx-vp8 bug.

 I can confirm without -lag-in-frames 1 or with -pix_fmt yuv420p the result
 file is OK.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5815#comment:17>
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