[Bug 785011] Sometime between 1.10.4 and 1.12.0 MKV video decode broke when mapping buffers to get pixel data

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785011

--- Comment #3 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Ok so you have a custom sink that uses mmap'd memory. Can you give some more
details about how that works? Does it provide memory to the decoder (I assume
you use avdec_h264?) or copy inside the sink from the decoder memory to the
mmap'd memory? What exactly is that mmap'd memory based on?

Do you get properly decoded video inside your sink, e.g. if you write out the
memory to a file and check what it contains?


Also it seems unlikely that this is related to Matroska, it must be something
related to the decoder element. That it works for MP4 must be coincidence.

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