[Bug 752802] avviddec: Sends incorrect CAPS event before the correct one

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752802

--- Comment #11 from Olivier Crête <olivier.crete at ocrete.ca> ---
This is worse than I though, here are some bits from my discussion on
#ffmpeg-devel

<nevcairiel> interlacing is of no consequence to the memory requirements for
the image buffer, and all other relevant properties are well known at that time
<ocrete> in many hardware, you need to initialise the display to get the ram
from
<nevcairiel> and get_buffer2 is not a callback to initialize your display, its
a callback to get a memory buffer to decode the frame into
<nevcairiel> if you use it for something else, you get to deal with problems
from that :)(
<wm4> are you sure software decoding would be fast enough to even reach
realtime on such a crappy restricted device?
<wm4> but a memcpy kills it?
<wm4> at this point you could probably decode a frame to software memory,
initialize the display, and then decode to video ram
<wm4> by starting again


So I think we have two options:
1. Drop the whole downstream allocation codepath from gst-libav, it may have
the side-effect of simplifying the code quite a bit.
2. Decode enough to get one output frame, get the caps, and then start decoding
for real...

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