[FFmpeg-trac] #3221(undetermined:new): best effort time stamp is wrong after av_seek_frame is called.

[FFmpeg]

#3221: best effort time stamp is wrong after av_seek_frame is called.
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             Reporter:  hxuanyu      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by hxuanyu):

 Hi I added avcodec_flush_buffers before calling av_seek_frame, but result
 still seems incorrect, sorry the log format is not so good, you can check
 attached file log1.

 When I seek to dts 3, and continue to read. I expected to get a full frame
 straight away. But in fact until I read out 5 packets I could get the
 first full frame.

         Line 463: 00:00:32.620  MAIN  rhbc73 Packet [0] dts = 0, pts =
 -9223372036854775808, KEY =1
         Line 465: 00:00:32.620  MAIN  rhbc73          **************** NO
 complete frame
         Line 469: 00:00:32.620  MAIN  rhbc73 Packet [1] dts = 1, pts =
 -9223372036854775808, KEY =1
         Line 471: 00:00:32.620  MAIN  rhbc73          **************** NO
 complete frame
         Line 473: 00:00:32.620  MAIN  rhbc73 Packet [2] dts = 2, pts =
 -9223372036854775808, KEY =0
         Line 475: 00:00:32.620  MAIN  rhbc73          **************** NO
 complete frame
         Line 477: 00:00:32.620  MAIN  rhbc73 Packet [3] dts = 3, pts =
 -9223372036854775808, KEY =1
         Line 479: 00:00:32.620  MAIN  rhbc73          **************** NO
 complete frame
         Line 481: 00:00:32.620  MAIN  rhbc73 Packet [4] dts = 4, pts =
 -9223372036854775808, KEY =1
         Line 483: 00:00:32.620  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 0, best effort time stamp = 0
         Line 485: 00:00:32.620  MAIN  rhbc73 Packet [5] dts = 5, pts =
 -9223372036854775808, KEY =0
         Line 487: 00:00:32.620  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 1, best effort time stamp = 1
         Line 489: 00:00:32.620  MAIN  rhbc73 Packet [6] dts = 6, pts =
 -9223372036854775808, KEY =0
         Line 491: 00:00:32.620  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 2, best effort time stamp = 2
         Line 493: 00:00:32.620  MAIN  rhbc73 Packet [7] dts = 7, pts =
 -9223372036854775808, KEY =0
         Line 495: 00:00:32.635  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 3, best effort time stamp = 3
         Line 497: 00:00:32.635  MAIN  rhbc73 Packet [8] dts = 8, pts =
 -9223372036854775808, KEY =1
         Line 499: 00:00:32.635  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 4, best effort time stamp = 4
         Line 501: 00:00:32.635  MAIN  rhbc73 Packet [9] dts = 9, pts =
 -9223372036854775808, KEY =0
         Line 503: 00:00:32.635  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 5, best effort time stamp = 5
         Line 505: 00:00:32.635  MAIN  rhbc73 Packet [10] dts = 10, pts =
 -9223372036854775808, KEY =0
         Line 507: 00:00:32.635  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 6, best effort time stamp = 6
         Line 509: 00:00:32.635  MAIN  rhbc73 now try to see to packet
 where dts = 3
         Line 511: 00:00:32.635  MAIN  rhbc73 seek succeed, then continue
 to read
         Line 515: 00:00:32.635  MAIN  rhbc73 Packet [11] dts = 3, pts =
 -9223372036854775808, KEY =1
         Line 517: 00:00:32.635  MAIN  rhbc73          **************** NO
 complete frame
         Line 521: 00:00:32.635  MAIN  rhbc73 Packet [12] dts = 4, pts =
 -9223372036854775808, KEY =1
         Line 523: 00:00:32.635  MAIN  rhbc73          **************** NO
 complete frame
         Line 527: 00:00:32.635  MAIN  rhbc73 Packet [13] dts = 5, pts =
 -9223372036854775808, KEY =0
         Line 529: 00:00:32.635  MAIN  rhbc73          **************** NO
 complete frame
         Line 531: 00:00:32.635  MAIN  rhbc73 Packet [14] dts = 6, pts =
 -9223372036854775808, KEY =0
         Line 533: 00:00:32.651  MAIN  rhbc73          **************** NO
 complete frame
         Line 537: 00:00:32.651  MAIN  rhbc73 Packet [15] dts = 7, pts =
 -9223372036854775808, KEY =0
         Line 539: 00:00:32.651  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 3, best effort time stamp = 3
         Line 541: 00:00:32.651  MAIN  rhbc73 Packet [16] dts = 8, pts =
 -9223372036854775808, KEY =1
         Line 543: 00:00:32.651  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 4, best effort time stamp = 4
         Line 547: 00:00:32.651  MAIN  rhbc73 Packet [17] dts = 9, pts =
 -9223372036854775808, KEY =0
         Line 549: 00:00:32.651  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 5, best effort time stamp = 5
         Line 553: 00:00:32.651  MAIN  rhbc73 Packet [18] dts = 10, pts =
 -9223372036854775808, KEY =0
         Line 555: 00:00:32.651  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 6, best effort time stamp = 6
         Line 557: 00:00:32.651  MAIN  rhbc73 Packet [19] dts = 11, pts =
 -9223372036854775808, KEY =0
         Line 559: 00:00:32.651  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 7, best effort time stamp = 7
         Line 563: 00:00:32.651  MAIN  rhbc73 Packet [20] dts = 12, pts =
 -9223372036854775808, KEY =1
         Line 565: 00:00:32.651  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 8, best effort time stamp = 8
         Line 567: 00:00:32.651  MAIN  rhbc73 Packet [21] dts = 13, pts =
 -9223372036854775808, KEY =0
         Line 569: 00:00:32.651  MAIN  rhbc73            =======
 got a complete frame, pkt_dts = 9, best effort time stamp = 9

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Ticket URL: <https://trac.ffmpeg.org/ticket/3221#comment:3>
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