The default backend is macosx but using it leads to the error I mentioned:
Traceback (most recent call last):
File "./fftest.py", line 24, in <module>
ani.save('animation.avi')
File "/Library/Python/2.6/site-packages/matplotlib/animation.py",
line 615, in save
writer.grab_frame()
File "/Library/Python/2.6/site-packages/matplotlib/animation.py",
line 199, in grab_frame
dpi=self.dpi)
File "/Library/Python/2.6/site-packages/matplotlib/figure.py", line
1370, in savefig
self.canvas.print_figure(*args, **kwargs)
File
"/Library/Python/2.6/site-packages/matplotlib/backend_bases.py", line
2015, in print_figure
print_method = self._get_print_method(format)
File
"/Library/Python/2.6/site-packages/matplotlib/backend_bases.py", line
1956, in _get_print_method
'%s.' % (format, ', '.join(formats)))
ValueError: Format "rgba" is not supported.
Supported formats: bmp, emf, eps, gif, jpeg, jpg, pdf, pgf, png, ps,
raw, rgba, svg, svgz, tif, tiff.
The above error does not occur if I switch to agg.
Also using the ffmpeg command
ffmpeg -f image2 -i t%d.jpg video.avi
on a few images gives the following output, where I put !! next to the
lines which are suppressed by including -loglevel quiet
FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
built on May 2 2013 23:13:41 with llvm_gcc 4.2.1 (Based on Apple
Inc. build 5658) (LLVM build 2336.9.00)
configuration: --enable-libmp3lame --enable-shared --disable-mmx
--arch=x86_64
libavutil 50.36. 0 / 50.36. 0
libavcore 0.16. 1 / 0.16. 1
libavcodec 52.108. 0 / 52.108. 0
libavformat 52.93. 0 / 52.93. 0
libavdevice 52. 2. 3 / 52. 2. 3
libavfilter 1.74. 0 / 1.74. 0
libswscale 0.12. 0 / 0.12. 0
Input #0, image2, from 't%d.jpg':
Duration: 00:00:00.12, start: 0.000000, bitrate: N/A
Stream #0.0: Video: mjpeg, yuvj422p, 4272x2848, 25 tbr, 25 tbn, 25 tbc
File 'video.avi' already exists. Overwrite ? [y/N] y
!![buffer @ 0x7fff094014b0] w:4272 h:2848 pixfmt:yuvj422p
!![ffsink @ 0x7fff094016d0] auto-inserting filter 'auto-inserted
scaler 0' between the filter 'src' and the filter 'out'
!![scale @ 0x7fff094018f0] w:4272 h:2848 fmt:yuvj422p -> w:4272 h:2848
fmt:yuv420p flags:0x4
!!Output #0, avi, to 'video.avi':
!! Metadata:
!! ISFT : Lavf52.93.0
!! Stream #0.0: Video: mpeg4, yuv420p, 4272x2848, q=2-31, 200 kb/s,
25 tbn, 25 tbc
Stream mapping:
Stream #0.0 -> #0.0
Press [q] to stop encoding
frame= 3 fps= 2 q=4.0 Lsize= 524kB time=0.12 bitrate=35781.7kbits/s
video:519kB audio:0kB global headers:0kB muxing overhead 1.083673%
Quoting Tony Yu <tsy...@gmail.com>:
> On Mon, May 6, 2013 at 7:09 AM, Colin McAuliffe <cjm2...@columbia.edu>wrote:
>
>> Hi Tony, thanks for the reply.
>>
>> I was using 1.2.0 and just upgraded to 1.2.1 but the problem persists. I
>> ran the example code from the link and it hangs after 350-400 frames. Also,
>> I got an error when running the code as it is posted and had to add:
>>
>> import matplotlib
>> matplotlib.use("Agg")
>>
>> to get it to work. Is this an incorrect setting I'm using?
>>
>> Colin
>
>
> Hmm, that's strange: Your problem sounds too similar to be a different bug.
> Could you copy the error message you got? It might be a clue. Also, what
> backend are you running?
>
>>>> import matplotlib.pyplot as plt
>>>> print plt.rcParams['backend']
>
> Another possibility (longshot) is that your version of `ffmpeg` may not
> respect the `-loglevel quiet` flag being passed to suppress output. Maybe
> you could try running an `ffmpeg` command with and without that flag to see
> if it works.
>
> -Tony
>
--
Colin McAuliffe
PhD Candidate
Columbia University
Department of Civil Engineering and Engineering Mechanics
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