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

[Lou]

On Wed, 3 Sep 2014 13:54:11 -0700 (PDT)
ifightnoman <ifightnoman at gmail.com> wrote:

> 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.

Please show the complete ffmpeg console output.