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

FFmpeg trac at avcodec.org
Tue Dec 31 00:47:20 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 madscientist159):

 My tests with long running streams are showing minor drift back and forth
 around proper sync, but no long-term desync using my patched ffmpeg copy
 that passes the hardware timestamps straight through into the encoders for
 both video and audio.  The drift seems to be up to a frame either side,
 which at 24P is still a fairly serious issue.  VLC seems to be a reliable
 witness for the A/V sync issues on 1/4 playback speed, as is Blender.

 It would be useful to get the showwaves issue corrected; at minimum, it
 may shed some light on why there is minor sync "wobble" over time with the
 live streams.  Getting this fixed would also repair kdenlive.

Ticket URL: <https://trac.ffmpeg.org/ticket/8443#comment:13>
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