[FFmpeg-trac] #9367(ffplay:closed): H264 does NOT support slice multi threading mode

FFmpeg trac at avcodec.org
Sat Aug 7 16:03:42 EEST 2021


#9367: H264 does NOT support slice multi threading mode
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:  (none)
  Core_2_Extreme                     |
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:  ffplay
              Version:  unspecified  |               Resolution:  invalid
             Keywords:  h264 thread  |               Blocked By:
  slice                              |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Comment (by Core_2_Extreme):

 Replying to [comment:5 mkver]:
 > Slice multithreading depends upon the input being composed of multiple
 slices. For it to work you have to encode your file with multiple slices
 (use -slices).

 I encoded following command
 {{{
 ffmpeg.exe -i BigBuckBunny.mp4 -vcodec libx264 -preset ultrafast -s
 3840x2160 -slices 8 -acodec copy 4k_slices.mp4
 }}}

 and played it following command then it worked.
 {{{
 ffplay.exe -thread_type slice -vcodec h264 4k_slices.mp4
 }}}
 https://i.gyazo.com/f11e7397f15921a8c7023308d9f1a707.png
 Thank you so much.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9367#comment:6>
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