[FFmpeg-trac] #10797(avfilter:new): showspectrumpic is unreasonably RAM hungry

[FFmpeg]

#10797: showspectrumpic is unreasonably RAM hungry
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             Reporter:  ed        |                     Type:  enhancement
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Summary of the bug:
 when creating a spectrogram of a large audio file, FFmpeg can easily
 consume 3+ GiB of RAM.

 My current workaround is to replace FFmpeg with sox for this purpose,
 since that only needs 6 MiB for the same task -- but I prefer the output
 that FFmpeg produces, so looking forward to switching back.

 How to reproduce:
 {{{
 # first produce an audio file with a long duration:
 ffmpeg -f lavfi -i sine=f=140:d=12345 big.flac

 # then create a spectrogram; this takes ~2.5G to process:
 ffmpeg -i big.flac -filter_complex showspectrumpic=s=640x512 -frames:v 1
 spec.png
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10797>
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