[FFmpeg-trac] #563(undetermined:new): Sorenson Spark: first frame is no keyframe

[FFmpeg]

#563: Sorenson Spark: first frame is no keyframe
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:  flv1
             Blocked By:             |               Blocking:
Reproduced by developer:  1          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 Attached sample plays fine with mplayer -demuxer lavf -vc ffflv, shows
 initial grey frames with ffmpeg (apparently skipping the initial keyframe)
 {{{
 $ ffmpeg -i trains_cut.flv -qscale 2 -t 10 out.avi
 ffmpeg version N-33698-gae85fd2, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Oct 16 2011 19:02:27 with gcc 4.5.3
   configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc
   libavutil    51. 21. 0 / 51. 21. 0
   libavcodec   53. 20. 1 / 53. 20. 1
   libavformat  53. 16. 0 / 53. 16. 0
   libavdevice  53.  4. 0 / 53.  4. 0
   libavfilter   2. 43. 6 /  2. 43. 6
   libswscale    2.  1. 0 /  2.  1. 0
 [flv @ 0x1305b60] warning: first frame is no keyframe

 Seems stream 0 codec frame rate differs from container frame rate: 1000.00
 (1000/1) -> 25.00 (25/1)
 Input #0, flv, from 'trains_cut.flv':
   Metadata:
     datasize        : 14613960
     lasttimestamp   : 212960
     audiosize       : 1802309
     videosize       : 12811397
     metadatacreator : inlet media - FLVTool2
     encoder         : Riva FLV Encoder
   Duration: 00:03:33.00, start: 0.000000, bitrate: 78 kb/s
     Stream #0:0: Video: flv1, yuv420p, 640x480, 490 kb/s, 25 tbr, 1k tbn,
 1k tbc
     Stream #0:1: Audio: mp3, 44100 Hz, mono, s16, 64 kb/s
 [buffer @ 0x1305060] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:0/1
 sws_param:
 Incompatible sample format 's16' for codec 'ac3', auto-selecting format
 'flt'
 Output #0, avi, to 'out.avi':
   Metadata:
     datasize        : 14613960
     lasttimestamp   : 212960
     audiosize       : 1802309
     videosize       : 12811397
     metadatacreator : inlet media - FLVTool2
     ISFT            : Lavf53.16.0
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 640x480,
 q=2-31, 200 kb/s, 25 tbn, 25 tbc
     Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 44100 Hz, mono, flt,
 128 kb/s
 Stream mapping:
   Stream #0.0 -> #0.0 (flv -> mpeg4)
   Stream #0.1 -> #0.1 (mp3 -> ac3)
 Press [q] to stop, [?] for help
 [flv @ 0x1305b60] warning: first frame is no keyframe
 frame=  249 fps=  0 q=2.0 Lsize=    1611kB time=00:00:10.00
 bitrate=1319.4kbits/s
 video:1431kB audio:157kB global headers:0kB muxing overhead 1.410500%
 }}}

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/563>
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