[Bug 652951] matroskamux and vp8enc: filed to set invisble flag for vp8 altref frames

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=652951
  GStreamer | gst-plugins-good | git

--- Comment #1 from Alexey Fisher <bug-track at fisher-privat.net> 2011-06-19 16:02:17 UTC ---
steps to reproduce. auto-alt-ref-frames is important to reproduce it:
make first pass:
gst-launch filesrc location=some_file.ogg ! decodebin2 ! vp8enc
multipass-cache-file=multipass.cache multipass-mode=1 mode=vbr bitrate=2000000 
auto-alt-ref-frames=1 ! fakesink

make second pass:
gst-launch filesrc location=some_file.ogg ! decodebin2 ! vp8enc
multipass-cache-file=multipass.cache multipass-mode=2 mode=vbr bitrate=2000000 
auto-alt-ref-frames=1 ! webmmux ! filesink location=test.webm

play the file. you will get lots of artifacts in the video. The reason is,
altref/invisible frames are played.

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