[FFmpeg-trac] #3989(undetermined:new): "Overwrite?" dialog causes frozen video when capturing desktop video

[FFmpeg]

#3989: "Overwrite?" dialog causes frozen video when capturing desktop video
-------------------------------------+-------------------------------------
             Reporter:  oconnor663   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 1) Record some video of the desktop with a command like `ffmpeg -f x11grab
 -i $DISPLAY test.mkv`.

 2) Without deleting the video from (1), run that command again. This time
 it pauses with the question "File 'test.mkv' already exists. Overwrite ?
 [y/N]". Wait a few seconds before saying yes.

 3) Play the resulting video in VLC.

 BUG: The video begins with several seconds of stillness, corresponding to
 the amount of time you waited at the prompt in (2).

 Repros on the release version (1:2.4.1-1, Arch Linux) and also when I
 build locally from master.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3989>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker