[FFmpeg-user] filter thumbnail does not respect aspect ratio

[Carl Eugen Hoyos]

Thomas Seilund <tps <at> netmaster.dk> writes:

> 16:9 video:
> 
> ffmpeg -i p20120122142736.mpg -ss 0 -vf thumbnail 
> -frames:v 1 thumbnail.jpg

What does ffmpeg -i thumbnail.jpg report?
I am also (often) using ImageMagick to test 
issues, but it is definitely not a bug-free 
project (see for example 61a9f09).

Carl Eugen