[FFmpeg-trac] #8443(undetermined:new): A/V drift when reencoding NTSC

FFmpeg trac at avcodec.org
Thu Dec 26 18:38:17 EET 2019

#8443: A/V drift when reencoding NTSC
             Reporter:               |                    Owner:
  madscientist159                    |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |

Comment (by pdr0):

 Yes, showwaves and/or overlay is affected  .

 But the actual file AV sync is ok (white flashes in the video sync with
 audio waveform) .

 Just watching it in a media player, can you detect desync with the white
 flashes ? There is a disconnect with showwaves (possibly showwaves is not

 Or are you saying the track audio waveform in kdenlive (not showwaves)
 also goes out of sync with the white flashes in kdenlive ?

 This is not a good diagnostic test for your other livestream AV sync issue
 - since there appears to be some accuracy issue with showwaves

Ticket URL: <https://trac.ffmpeg.org/ticket/8443#comment:5>
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