[FFmpeg-trac] #5018(undetermined:new): incorrect PTS/DTS on first frame of RTSP stream

[FFmpeg]

#5018: incorrect PTS/DTS on first frame of RTSP stream
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             Reporter:  Scott Lamb   |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  rtsp h264    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Mika Fischer):

 Replying to [comment:5 Scott Lamb]:
 > I just discovered an effective workaround: `-fflags nobuffer`. The first
 frame's pts is fine then.

 While this indeed prevents the frame with NOPTS, it also swallows the
 packet with NOPTS, which leads to the decoder swallowing all the following
 non-I-frames, so a whole GOP is lost.

 We see this issue with every single rtsp stream from a camera-like device.
 For instance try "IP Webcam" on Android
 (https://play.google.com/store/apps/details?id=com.pas.webcam&hl=de&gl=US)...
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Ticket URL: <https://trac.ffmpeg.org/ticket/5018#comment:8>
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