[FFmpeg-trac] #9030(undetermined:new): -ss with codec copy corrupts output

[FFmpeg]

#9030: -ss with codec copy corrupts output
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  balintlaczko                       |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by balintlaczko):

 ```
 > ffmpeg -i dance.mp4 -ss 5 -t 5 -codec copy out.mp4
 ffmpeg version 2020-12-12-git-5148740e79-full_build-www.gyan.dev Copyright
 (c) 2000-2020 the FFmpeg developers
   built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
   configuration: --enable-gpl --enable-version3 --enable-static --disable-
 w32threads --disable-autodetect --enable-fontconfig --enable-iconv
 --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-
 libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq
 --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2
 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1
 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid
 --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass
 --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-
 libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-
 llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc
 --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang
 --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-
 libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-
 libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame
 --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-
 libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis
 --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa
 --enable-librubberband --enable-libsoxr --enable-chromaprint
   libavutil      56. 62.100 / 56. 62.100
   libavcodec     58.115.102 / 58.115.102
   libavformat    58. 65.100 / 58. 65.100
   libavdevice    58. 11.103 / 58. 11.103
   libavfilter     7. 93.100 /  7. 93.100
   libswscale      5.  8.100 /  5.  8.100
   libswresample   3.  8.100 /  3.  8.100
   libpostproc    55.  8.100 / 55.  8.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'dance.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf58.29.100
   Duration: 00:00:10.05, start: 0.000000, bitrate: 1066 kb/s
     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661),
 yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], 923 kb/s, 59.94 fps, 59.94
 tbr, 19001 tbn, 119.88 tbc (default)
     Metadata:
       handler_name    : VideoHandler
       vendor_id       : [0][0][0][0]
     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 129 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
       vendor_id       : [0][0][0][0]
 Output #0, mp4, to 'out.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf58.65.100
     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661),
 yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 923 kb/s, 59.94 fps,
 59.94 tbr, 19001 tbn, 19001 tbc (default)
     Metadata:
       handler_name    : VideoHandler
       vendor_id       : [0][0][0][0]
     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 129 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
       vendor_id       : [0][0][0][0]
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 frame=  102 fps=0.0 q=-1.0 Lsize=     267kB time=00:00:04.99 bitrate=
 437.5kbits/s speed=2.16e+03x
 video:184kB audio:78kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 1.779118%
 ```

--
Ticket URL: <https://trac.ffmpeg.org/ticket/9030#comment:2>
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