#18176: Show animation
-------------------------------------+-------------------------------------
Reporter: vbraun | Owner:
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-6.6
Component: graphics | Resolution:
Keywords: | Merged in:
Authors: Volker Braun | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vbraun/show_animation | 39263a4fc8c59879373a47d55a9040a5d6702de9
Dependencies: | Stopgaps:
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Comment (by gagern):
When was the last time you had a Sage-generated movie play at a cinema in
your parts? On a more serious note, I believe that `delay` makes a lot of
sense if one speaks of a number associated to individual frames, but less
so if it's the same for all of them. Which is a reason why `delay` makes
more sense in a GIF environment than an MPEG one.
`show` does go through `save` only since your
[http://git.sagemath.org/sage.git/commit/?h=7747261d04e4ff0105fb514a2109b2d014396e2a
commit 7747261]. It was calling `gif` before that. In
[http://git.sagemath.org/sage.git/commit/?h=dc0067dbd358313ffaf58119e32a18f5ee5872df
dc0067d] for #7298 I had written a code path which routed `show` through
`save` without breaking such stuff. Unfortunately, #7298 won't merge since
it conflicts with your changes, and I haven't yet found the time to
rewrite it appropriately.
Test coverage is tricky. Since we don't bundle imagemagick, we can't rely
on `convert` so we can't create GIF. The same holds for ffmpeg and the
various video formats. And even if we had these tools enabled, how do we
automatically verify that the file looks as it should? I guess we could
disassemble the file to some textual representation of all its settings,
but that would require considerable amounts of code. Or we could set up
something like Selenium based tests. Although it's hard to get timing
right with those. But I'm against punting a useful feature just because we
can't auto-test it as well as we'd like.
--
Ticket URL: <http://trac.sagemath.org/ticket/18176#comment:16>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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