[FFmpeg-trac] #4824(undetermined:reopened): Rtmp Lip-sync trouble

FFmpeg trac at avcodec.org
Thu Sep 3 17:12:14 CEST 2015

#4824: Rtmp Lip-sync trouble
             Reporter:  laurfb       |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  flv desync   |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
Changes (by laurfb):

 * status:  closed => reopened
 * resolution:  worksforme =>


 Hi. My mistake :(
 Yes, ffplay, vlc, mpc or any other software player allways play well the
 saved file or live stream.
 The lip-sync issue apperar allways when I try to play/output the live
 stream or saved files from ffmpeg to any decklink output card (video &
 audio). It's not related to decklink cause any proper flv file without
 timestamp error is allways played well.
 Seems that ffmpeg cannot properly handle the DTS timestamp error while
 ffplay can!
 The same stream/saved files plays allways without any trouble with ffplay!
 Running ffprobe on out.flv fiels you provided or on any live stream from
 that live source we can see allways "Non-increasing DTS in stream..."
 I think the lip-sync issue is related only to the way that ffmpeg handle
 that DTS error.

 best regards,

Ticket URL: <https://trac.ffmpeg.org/ticket/4824#comment:2>
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