[FFmpeg-user] Problem finding codec parameters in m4v file

[ifightnoman]

I have a large (1 GB) m4v file that ffmpeg is unable to decode.
I am trying to generate a thumbnail from this file but hit the error
message:

[buffer @ 027fd600] Unable to parse option value "-1" as pixel format
    Last message repeated 1 times
[buffer @ 027fd600] Error setting option pix_fmt to value -1.
[graph 0 input from stream 0:0 @ 027d4400] Error applying options to the
filter.

Here is my command line, which works for every other video file that I've
tried:

ffmpeg -i "C:\Videos\slice_00007.m4v" -vf "thumbnail,scale=512:512"
-frames:v 1 -y -f mjpeg "C:\Videos\slice.jpg"

I've hosted the file via Dropbox,  here
<https://www.dropbox.com/s/twa4lauc49ajvqi/slice_00007.m4v?dl=0>  .

I've tried several different builds of ffmpeg. The current one is a very
recent static build:

ffmpeg version N-66012-g97b8809 Copyright (c) 2000-2014 the FFmpeg
developers
  built on Sep  1 2014 00:07:41 with gcc 4.8.3 (GCC)



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