[MPlayer-users] Screenshot filter broken by FFmpeg 419ade4

[Josh]

It appears that this commit in FFmpeg breaks the screenshot filter in 
MPlayer: 
http://git.videolan.org/?p=ffmpeg.git;a=commit;h=419ade4b6193c6eb626cda01b21e7091f42b2cc2

It results in the error:
Opening video filter: [screenshot]
  [png @ 01193440]dimensions not set
Could not open libavcodec PNG encoder
Couldn't open video filter 'screenshot'.

Of course when attempting a screenshot:
sending VFCTRL_SCREENSHOT!
failed (forgot -vf screenshot?)

Reversing that commit fixes screenshots.