"list index out of range" error or Arch Linux x86-64

[smikims]

When the interline parameter of TextClip is not specified or is above about -19 (the specific number seems to depend on font and font size), I get this error:

Traceback (most recent call last):
File "movie3.py", line 18, in
font='Courier').
File "/usr/lib/python2.7/site-packages/moviepy/video/VideoClip.py", line 842, in init
ImageClip.init(self, tempfile, transparent=transparent)
File "/usr/lib/python2.7/site-packages/moviepy/video/VideoClip.py", line 651, in init
img = ffmpeg_reader.read_image(img,with_mask=transparent)
File "/usr/lib/python2.7/site-packages/moviepy/video/io/ffmpeg_reader.py", line 152, in read_image
vf = FFMPEG_VideoReader(filename, pix_fmt=pix_fmt)
File "/usr/lib/python2.7/site-packages/moviepy/video/io/ffmpeg_reader.py", line 17, in init
self.load_infos(print_infos)
File "/usr/lib/python2.7/site-packages/moviepy/video/io/ffmpeg_reader.py", line 55, in load_infos
line = [l for l in lines if ' Video: ' in l][0]
IndexError: list index out of range

[Zulko]

Could you please post one example which works and one that doesn't ? I can't reproduce the bug (but maybe someone else can) and I can't imagine where it comes from. The only logical explanation is that ImageMagick cannot do some interline for some fonts and doesn't produce a picture at all (do you have a temporary image file in your directory after running the script ? Something like TEMP_MPY....png ?)

[smikims]

Here's one that produces bad overlapping text:

text = TextClip("In my nightmares\nI see rabbits.",
                fontsize=20, color='white',
                font='Courier', interline=-16).\
            set_pos((20,190)).\
            set_duration(olaf.duration)

And here's the one that produced the error message above:

text = TextClip("In my nightmares\nI see rabbits.",
                fontsize=20, color='white',
                font='Courier').\
            set_pos((20,190)).\
            set_duration(olaf.duration)

And yes, there is a temp.png in the current working directory, which contains the text with correct spacing in the middle of the image and everything else is transparent.

[Zulko]

Ok. could you please in this folder type this in a terminal and tell me what it prints ?

ffmpeg -i temp.png

thanks for your patience :)

[smikims]

Here you go:

ffmpeg version 2.1.3 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan 15 2014 20:51:13 with gcc 4.8.2 (GCC) 20131219 (prerelease)
  configuration: --prefix=/usr --disable-debug --disable-static --enable-avresample --enable-dxva2 --enable-fontconfig --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-pic --enable-postproc --enable-runtime-cpudetect --enable-shared --enable-swresample --enable-vdpau --enable-version3 --enable-x11grab
  libavutil      52. 48.101 / 52. 48.101
  libavcodec     55. 39.101 / 55. 39.101
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libavresample   1.  1.  0 /  1.  1.  0
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
[png @ 0xae9ae0] unsupported bit depth 16 and color type 4
[image2 @ 0xae9040] decoding for stream 0 failed
[image2 @ 0xae9040] Could not find codec parameters for stream 0 (Video: png, 193x35): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
temp.png: could not find codec parameters

[Zulko]

Ok, apparently your ffmpeg does not like the output of your ImageMagick, so I would say that this is not really a MoviePy issue. Are your ffmpeg and your ImageMagick recent ? If not I would suggest to first download a recent ffmpeg binary to replace the former (or put it in a different folder, see moviepy docs), and see if it works.

An alternative explanation would be that for some reason ImageMagick decides to output a grey-level picture. This could be fixed, but I don't think it is the issue.

[smikims]

I already had the latest, but just to make sure I got the latest static build from the ffmpeg website and the results were the same.

[jackMort]

try change this line: https://github.com/Zulko/moviepy/blob/master/moviepy/video/VideoClip.py#L832
to:

        "-type",  "truecolormatte", "PNG32:%s" % tempfile]

[Zulko]

Smikims, do you confirm that it solves the problem ?

[dbrgn]

I'm having the same problems (also on ArchLinux), and the fix by @jackMort helps.

[Zulko]

Ok, I commited the change on Github and PyPI, thanks all, thanks jackMort. I am closing the issue for now.