[FFmpeg-trac] #7179(undetermined:new): ffmpeg with overlay and -ss cause the second layer to start on the wrong frame

[FFmpeg]

#7179: ffmpeg with overlay and -ss cause the second layer to start on the wrong
frame
-------------------------------------+-------------------------------------
             Reporter:  jsteinkamp   |                     Type:  defect
               Status:  new          |                 Priority:  critical
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  overlay      |               Blocked By:
  with startframe                    |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 ::start on frame 11 end 15 -ss start in seconds 11-1 / 30 =
 0.33333333333333333333333333333333
 set sf=0.33333333333333333333333333333333
 ffmpeg -y -framerate 30 -i %st% -ss %sf% -framerate 30 -i %st% -ss %sf%
 -frames 5 -filter_complex [0:v][1:v]overlay %codec% -start_number 11
 %output%

 ::FFMPEG READOUT
 ffmpeg version git-2017-12-18-3f88744 Copyright (c) 2000-2017 the FFmpeg
 developers
   built with gcc 7.2.0 (GCC)
   configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
 bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass
 --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-
 libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
 --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
 --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack
 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-
 libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
 --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc
 --enable-dxva2 --enable-avisynth --enable-libmfx
   libavutil      56.  6.100 / 56.  6.100
   libavcodec     58.  8.100 / 58.  8.100
   libavformat    58.  3.100 / 58.  3.100
   libavdevice    58.  0.100 / 58.  0.100
   libavfilter     7.  7.100 /  7.  7.100
   libswscale      5.  0.101 /  5.  0.101
   libswresample   3.  0.101 /  3.  0.101
   libpostproc    55.  0.100 / 55.  0.100
 Input #0, image2, from 'i\numbers.%04d.tif':
   Duration: 00:00:00.50, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: tiff, rgba, 400x100 [SAR 1:4 DAR 1:1], 30 fps, 30
 tbr, 30 tbn, 30 tbc
 Input #1, image2, from 'i\numbers.%04d.tif':
   Duration: 00:00:00.50, start: 0.000000, bitrate: N/A
     Stream #1:0: Video: tiff, rgba, 400x100 [SAR 1:4 DAR 1:1], 30 fps, 30
 tbr, 30 tbn, 30 tbc
 Stream mapping:
   Stream #0:0 (tiff) -> overlay:main
   Stream #1:0 (tiff) -> overlay:overlay
   overlay -> Stream #0:0 (tiff)
 Press [q] to stop, [?] for help
 Output #0, image2, to 'test1\t.%04d.tif':
   Metadata:
     encoder         : Lavf58.3.100
     Stream #0:0: Video: tiff, rgba, 400x100 [SAR 1:4 DAR 1:1], q=2-31, 200
 kb/s, 30 fps, 30 tbn, 30 tbc (default)
     Metadata:
       encoder         : Lavc58.8.100 tiff
 frame=    5 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.16 bitrate=N/A
 speed=5.73x
 video:55kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7179>
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