[FFmpeg-trac] #11248(ffmpeg:new): mapping of optional streams selected by language broken

[FFmpeg]

#11248: mapping of optional streams selected by language broken
--------------------------------+--------------------------------------
             Reporter:  Jakob   |                     Type:  defect
               Status:  new     |                 Priority:  normal
            Component:  ffmpeg  |                  Version:  git-master
             Keywords:  map     |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
--------------------------------+--------------------------------------
 Summary of the bug:

 I used to use `-map 0:s:m:language:eng?` to map only english subtitles
 into the output, but don't fail if there is no such subtitle. This worked
 fine until I updated ffmpeg to the latest version (#9601 also suggests
 that this used to work).

 Using either `-map 0:s:0?` or `-map 0:s:m:language:eng`, i.e. optional map
 by number or mandatory map by language, works as expected.

 How to reproduce:
 {{{
 % ffmpeg -i 0.mkv -c copy -map '0:s:m:language:eng?' out.srt
 ffmpeg version N-117538-g9ce63e65d6-20241015 Copyright (c) 2000-2024 the
 FFmpeg developers
   built with gcc 14.2.0 (crosstool-NG 1.26.0.120_4d36f27)
   configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static
 --pkg-config=pkg-config --cross-prefix=x86_64-ffbuild-linux-gnu-
 --arch=x86_64 --target-os=linux --enable-gpl --enable-version3 --disable-
 debug --enable-iconv --enable-zlib --enable-libfreetype --enable-
 libfribidi --enable-gmp --enable-libxml2 --enable-openssl --enable-lzma
 --enable-fontconfig --enable-libharfbuzz --enable-libvorbis --enable-
 opencl --enable-libpulse --enable-libvmaf --enable-libxcb --enable-xlib
 --enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth
 --enable-chromaprint --enable-libdav1d --enable-libdavs2 --enable-
 libdvdread --enable-libdvdnav --disable-libfdk-aac --enable-ffnvcodec
 --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar
 --enable-libaribcaption --enable-libass --enable-libbluray --enable-libjxl
 --enable-libmp3lame --enable-libopus --enable-librist --enable-libssh
 --enable-libtheora --enable-libvpx --enable-libwebp --enable-libzmq
 --enable-lv2 --enable-libvpl --enable-openal --enable-libopencore-amrnb
 --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg
 --enable-libopenmpt --enable-librav1e --enable-librubberband --disable-
 schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1
 --enable-libtwolame --enable-libuavs3d --enable-libdrm --enable-vaapi
 --enable-libvidstab --enable-vulkan --enable-libshaderc --enable-
 libplacebo --enable-libvvenc --enable-libx264 --enable-libx265 --enable-
 libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-
 cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-libs='-ldl -lgomp'
 --extra-ldflags=-pthread --extra-ldexeflags=-pie --cc=x86_64-ffbuild-
 linux-gnu-gcc --cxx=x86_64-ffbuild-linux-gnu-g++ --ar=x86_64-ffbuild-
 linux-gnu-gcc-ar --ranlib=x86_64-ffbuild-linux-gnu-gcc-ranlib --nm=x86_64
 -ffbuild-linux-gnu-gcc-nm --extra-version=20241015
   libavutil      59. 43.100 / 59. 43.100
   libavcodec     61. 22.100 / 61. 22.100
   libavformat    61.  9.100 / 61.  9.100
   libavdevice    61.  4.100 / 61.  4.100
   libavfilter    10.  6.100 / 10.  6.100
   libswscale      8.  6.100 /  8.  6.100
   libswresample   5.  4.100 /  5.  4.100
   libpostproc    58.  4.100 / 58.  4.100
 Input #0, matroska,webm, from '0.mkv':
 [... listing of all input streams ...]
 Stream map '' matches no streams.
 To ignore this, add a trailing '?' to the map.
 Failed to set value '0:a:m:language:eng?' for option 'map': Invalid
 argument
 Error parsing options for output file out.mkv.
 Error opening output files: Invalid argument
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11248>
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