[FFmpeg-trac] #6090(avcodec:new): ffmpeg duplicates the first frame when decoding attached hevc-file.

[FFmpeg]

#6090: ffmpeg duplicates the first frame when decoding attached hevc-file.
------------------------------------+-----------------------------------
             Reporter:  figgis      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  hevc dts    |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+-----------------------------------

Comment (by figgis):

 I increased the loglevel.

 {{{
 $ ffmpeg -loglevel 40 -y -i BQMall_832x480_60_QP46.hevc tmp.yuv
 ffmpeg version N-83136-gbdbbb8f Copyright (c) 2000-2017 the FFmpeg
 developers
   built with gcc 4.9.2 (Debian 4.9.2-10)
   configuration: --enable-gpl --enable-libx264
   libavutil      55. 43.100 / 55. 43.100
   libavcodec     57. 73.100 / 57. 73.100
   libavformat    57. 62.100 / 57. 62.100
   libavdevice    57.  2.100 / 57.  2.100
   libavfilter     6. 69.100 /  6. 69.100
   libswscale      4.  3.101 /  4.  3.101
   libswresample   2.  4.100 /  2.  4.100
   libpostproc    54.  2.100 / 54.  2.100
 [hevc @ 0x2ce3380] max_analyze_duration 5000000 reached at 5000000
 microseconds st:0
 Input #0, hevc, from 'BQMall_832x480_60_QP46.hevc':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: hevc (Main), 1 reference frame, yuv420p(tv),
 832x480, 60 fps, 60 tbr, 1200k tbn, 60 tbc
 [graph 0 input from stream 0:0 @ 0x2df3300] w:832 h:480 pixfmt:yuv420p
 tb:1/1200000 fr:60/1 sar:0/1 sws_param:flags=2
 Output #0, rawvideo, to 'tmp.yuv':
   Metadata:
     encoder         : Lavf57.62.100
     Stream #0:0: Video: rawvideo, 1 reference frame (I420 / 0x30323449),
 yuv420p, 832x480, q=2-31, 200 kb/s, 60 fps, 60 tbn, 60 tbc
     Metadata:
       encoder         : Lavc57.73.100 rawvideo
 Stream mapping:
   Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
 Press [q] to stop, [?] for help
 *** 1 dup!
 No more output streams to write to, finishing.
 frame=  602 fps=0.0 q=-0.0 Lsize=  352170kB time=00:00:10.05
 bitrate=287062.4kbits/s dup=1 drop=0 speed=32.4x
 video:352170kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.000000%
 Input file #0 (BQMall_832x480_60_QP46.hevc):
   Input stream #0:0 (video): 601 packets read (322614 bytes); 601 frames
 decoded;
   Total: 601 packets (322614 bytes) demuxed
 Output file #0 (tmp.yuv):
   Output stream #0:0 (video): 602 frames encoded; 602 packets muxed
 (360622080 bytes);
   Total: 602 packets (360622080 bytes) muxed
 }}}

 This is interesting. ffmpeg reports a {{{*** 1 dup!}}} None of my other
 decoders or analysis tools does this.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6090#comment:3>
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