[FFmpeg-user] trying to save its output to the input

[Mark Filipak]

FFmpeg is trying to save its output to the input

Any ideas why this is happening?

G:\foo>ffmpeg g:\foo\foo.VOB -map 0 -c copy -dn g:\foo\foo.mp4
ffmpeg version 2023-11-09-git-acf63d5350-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg 
developers
   built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
   configuration: --enable-gpl --enable-version3 --enable-static --pkg-config=pkgconf 
--disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls 
--enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib 
--enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth 
--enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption 
--enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e 
--enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 
--enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx 
--enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi 
--enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg 
--enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc 
--enable-dxva2 --enable-d3d11va --enable-libvpl --enable-libshaderc --enable-vulkan 
--enable-libplacebo --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-libcodec2 --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      58. 32.100 / 58. 32.100
   libavcodec     60. 33.100 / 60. 33.100
   libavformat    60. 17.100 / 60. 17.100
   libavdevice    60.  4.100 / 60.  4.100
   libavfilter     9. 13.100 /  9. 13.100
   libswscale      7.  6.100 /  7.  6.100
   libswresample   4. 13.100 /  4. 13.100
   libpostproc    57.  4.100 / 57.  4.100
Output #0, svcd, to 'g:\foo\foo.VOB':
[out#0/svcd @ 0000000000717400] Output file does not contain any stream
Error opening output file g:\foo\foo.VOB.
Error opening output files: Invalid argument