[FFmpeg-trac] #9307(undetermined:new): Seeking to the start of some files produces noise spike

[FFmpeg]

#9307: Seeking to the start of some files produces noise spike
-------------------------------------+-------------------------------------
             Reporter:  Misaki       |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  ffplay,      |               Blocked By:
  opus, libopus                      |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Comment (by Misaki):

 The 'seeking starts from a later packet' theory is correct.

 {{{ ffmpeg -i \[pow\ at\ start\]\[crop_1080\]屏東潮州 六姐妹ｉｎ新北市三重
 正義堂遶境\ Part２\[2012-06-17\]\ \[vUY-EH3gTRU\].webm -c copy -vn -ss
 0.01 copy.webm }}}

 Attached.

 {{{
  ffmpeg -i copy.webm -af astats -f null -
 [...]
   Duration: 00:00:00.99, start: 0.004000, bitrate: 95 kb/s
 [...]
 [Parsed_astats_0 @ 0x55c9a77f8100] Peak level dB: 14.207783
 [Parsed_astats_0 @ 0x55c9a77f8100] RMS level dB: -9.854039
 [Parsed_astats_0 @ 0x55c9a77f8100] RMS peak dB: -13.131624
 [...]
 [Parsed_astats_0 @ 0x55c9a77f8100] Number of samples: 46728
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9307#comment:1>
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