[FFmpeg-trac] #6435(ffmpeg:new): don't give overwriting error if the output is dev/null or pass 1 is specified.

[FFmpeg]

#6435: don't give overwriting error if the output is dev/null or pass 1 is
specified.
---------------------------------------+--------------------------------
               Reporter:  compn        |                  Owner:
                   Type:  enhancement  |                 Status:  new
               Priority:  wish         |              Component:  ffmpeg
                Version:  git-master   |               Keywords:
             Blocked By:               |               Blocking:
Reproduced by developer:  0            |  Analyzed by developer:  0
---------------------------------------+--------------------------------
 F:\>ffmpeg -i traintobusan.mp4 -c copy -f ipod NUL
 ffmpeg version N-83243-g2080bc3 Copyright (c) 2000-2017 the FFmpeg
 developers
   built with gcc 5.4.0 (GCC)
   configuration: --enable-gpl --enable-version3 --enable-cuda --enable-
 cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx
 --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig
 --enable-frei0r --enable-gnutls --enable-iconv --enable-l
 ibass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-
 libfreetype --enable-libgme --enable-libgsm --enable-libi
 lbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb
 --enable-libopencore-amrwb --enable-libopenh264 --enab
 le-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy
 --enable-libsoxr --enable-libspeex --enable-libtheora --e
 nable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-
 libvorbis --enable-libvpx --enable-libwavpack --enable-
 libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-
 libxvid --enable-libzimg --enable-lzma --enable-decklink
 --enable-zlib
   libavutil      55. 45.100 / 55. 45.100
   libavcodec     57. 75.100 / 57. 75.100
   libavformat    57. 63.100 / 57. 63.100
   libavdevice    57.  2.100 / 57.  2.100
   libavfilter     6. 70.100 /  6. 70.100
   libswscale      4.  3.101 /  4.  3.101
   libswresample   2.  4.100 /  2.  4.100
   libpostproc    54.  2.100 / 54.  2.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'traintobusan.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf56.4.101
   Duration: 01:58:00.90, start: 0.000000, bitrate: 688 kb/s
     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661),
 yuvj420p(pc), 676x360 [SAR 675:676 DAR 15:8], 599 kb/s, 25 fps,
  25 tbr, 12800 tbn, 50 tbc (default)
     Metadata:
       handler_name    : VideoHandler
     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
 stereo, fltp, 80 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
 File 'NUL' already exists. Overwrite ? [y/N]

 NUL is aka windows /dev/null , same thing applies on linux.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6435>
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