[FFmpeg-trac] #9998(avfilter:new): Problem with atrim and astats

[FFmpeg]

#9998: Problem with atrim and astats
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             Reporter:  Michael Koch  |                    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             |
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Comment (by Michael Koch):

 I found another problem. Use the same input file as above and trim it to a
 very short duration 10us which can contain only 0 or 1 sample:

 ffmpeg -i test.wav -af
 atrim=start=1.00025:duration=0.00001,astats=measure_perchannel="Min_level+Max_level":measure_overall=none
 -f null -

 This is the output:

 [Parsed_astats_1 @ 000001762b523e00] Min level: -268369920.000000
 [Parsed_astats_1 @ 000001762b523e00] Max level: 268369920.000000

 The measured levels are wrong, because the Min and Max levels can't be
 different if the stream doesn't contain more than one sample. With
 duration 30us (contains 1 or 2 samples) it works as expected.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9998#comment:2>
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