[FFmpeg-trac] #5878(avdevice:new): x11grab slow with smaller -video_size

[FFmpeg]

#5878: x11grab slow with smaller -video_size
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             Reporter:  lolilolicon  |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avdevice
              Version:  unspecified  |               Resolution:
             Keywords:  x11grab      |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by lolilolicon):

 Replying to [comment:5 cehoyos]:
 > Replying to [comment:4 lolilolicon]:
 > > ffmpeg version 3.0.git Copyright (c) 2000-2016 the FFmpeg developers
 >
 > Can you explain how you downloaded the source for this build?
 > I thought this should never happen, there should always be a useful
 version information...

 Ouch, sorry. I grabbed https://github.com/FFmpeg/FFmpeg/archive/master.zip
 I believe it's commit 572f16e10041c9af131709f88a53750a4b3db802

 >
 > I believe that {{{--disable-stripping}}} is never a good idea, debug is
 the default.

 I used the build script from my distro repo, which came with this; the
 build tool strips binaries later, IIRC.

 >
 > Please test if performance is better if you build with {{{--disable-
 libxcb --enable-x11grab --enable-gpl}}}.

 Added `--disable-libxcb`, performance of `ffmpeg` is improved somewhat,
 e.g. for `-video_size 100x100` time is `0.690` compared to `0.724`. But
 it's still bad at smaller sizes.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5878#comment:7>
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