#12827: Expand Animation class to accept more graphics types
-------------------------------------+-------------------------------------
Reporter: niles | Owner: jason, was
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.1
Component: graphics | Resolution:
Keywords: animate, | Merged in:
graphics, 3D | Reviewers:
Authors: Niles Johnson | Work issues: docstrings, testing,
Report Upstream: N/A | think about img protocol
Branch: | Commit:
u/niles/ticket/12827 | de5349040ebab566d5a0e35d99284e628ab21080
Dependencies: | Stopgaps:
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Comment (by jhpalmieri):
First, overall it looks pretty good to me.
Second, a typo: on the third line of `animate.py`, "iteratable" should be
"iterable".
Third, I'm having problems with ffmpeg; this is on OS X 10.9. To try to
fix them, I installed the latest version (from the git repo) of ffmpeg,
but the problems persist.
- the `-loop_output` flag leads to the error `Unrecognized option
'loop_output'.` The man page says
{{{
-loop_output number_of_times
Repeatedly loop output for formats that support looping such as
animated GIF (0 will loop the output infinitely). This option
is
deprecated, use -loop.
}}}
Of course, the man page doesn't say anything at all about `-loop` so I
don't know exactly how to use it, but just changing `-loop_output` to
`-loop` produces a valid animated file. (I also don't know how long the
`-loop` option has been available, so if we switch to that, will we just
be breaking old versions of ffmpeg, or will it affect fairly recent ones?)
- the `-g 3` option leads to `Codec AVOption g (set the group of picture
(GOP) size) specified for input file #0 (/Users/palmieri/.sage/temp
/Macintosh-001b639d44a1.local/67838/dir_lolwRD/%08d.png) is not a decoding
option.` Removing this option completely works. (I also can't find it in
the man page, so I don't know what it's supposed to do. The man page is
really not very good.)
- the `-pix_fmt rgb24` option leads to `Incompatible pixel format 'rgb24'
for codec 'gif', auto-selecting format 'pal8'`. I just deleted this option
and it works. Should we do that, or use `-pix_fmt rgb8` (for example)
instead? The available formats may depend on how ffmpeg was installed, so
it might be better to omit it and allow users to specify it using the
`ffmpeg_options` argument.
- finally, the gif file produced by ffmpeg (for example using the `sines`
animation) looks pretty bad: the axes and sine waves are multi-colored,
and not in a good way. Using ffmpeg to produce a .mov file or .avi file
works well.
--
Ticket URL: <http://trac.sagemath.org/ticket/12827#comment:19>
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