[FFmpeg-trac] #9461(avfilter:new): Showpectrumpic: scale doesn't work anymore

FFmpeg trac at avcodec.org
Thu Oct 21 09:49:13 EEST 2021

#9461: Showpectrumpic: scale doesn't work anymore
             Reporter:  RKleinert   |                    Owner:  (none)
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
Comment (by RKleinert):

 Replying to [comment:2 Elon Musk]:
 > It still works just fine, just no longer trims upper frequencies if user
 have supplied non power of 2 height or width (for vertical orientation).
 > Contrary to your claims, it does not loop forever, it just executes
 really slow because of current very slow and naive fft implementation for
 sizes you set.

 Thanks for your quick reply. As I don't really have insight in the
 workings of the function could you tell me, which sizes would work and
 which won't? So far I've gotten it to word with 1024x768 for instance.
 1000x768 works as well, but 1024x700 doesn't. So it works with a height of
 768 but not 700 although 768 is not a power of 2.
Ticket URL: <https://trac.ffmpeg.org/ticket/9461#comment:3>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker

More information about the FFmpeg-trac mailing list