first frame is no keyframe

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first frame is no keyframe

r3plica
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I am trying to create screenshots for any video file type that is uploaded into my system.
There is one video in my system that is having problems, it is a WMV file.

I am trying to run this command:

ffmpeg -ss 7 -i "83b00403-fb16-4266-a3a6-b9e94a941cc2.wmv" -vframes 1 -y -f image2 \ -vcodec mjpeg "c7f9c241-bb06-44cf-9843-ccecb023f7cf.png"

which works for everything except this file.
I ran this manually and in bold red writing I got the error in the subject:

first frame is no keyframe

And no thumbnail is created :(
Can someone let me know why?