[FFmpeg-trac] #11526(avformat:new): cmfv and cmfa not in hls allowed_extensions

[FFmpeg]

#11526: cmfv and cmfa not in hls allowed_extensions
----------------------------------+--------------------------------------
             Reporter:  gamer191  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+--------------------------------------
 Summary of the bug:
 Cmfv and cmfa are not in ffmpeg's HLS demuxer's list of
 allowed_extensions. This causes issues when downloading niconico videos
 using yt-dlp.

 This can be reproduced with `yt-dlp
 "https://www.nicovideo.jp/watch/sm44612421" --downloader ffmpeg` (the cmfa
 issue can be reproduced using `yt-dlp
 "https://www.nicovideo.jp/watch/sm44612421" --downloader ffmpeg -f
 bestaudio`). Alternatively, you can create a .m3u8 file containing
 {{{
 #EXTM3U
 #EXT-X-TARGETDURATION:174
 #EXTINF:135,
 https://example.com/file.cmfv
 }}}
 and then run
 {{{
 % ffmpeg -i file.m3u8
 ffmpeg version N-118897-gfc44ccd981-20250323 Copyright (c) 2000-2025 the
 FFmpeg developers
   built with gcc 14.2.0 (crosstool-NG 1.27.0.18_7458341)
   configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static
 --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64
 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug
 --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib
 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-libxml2
 --enable-lzma --enable-fontconfig --enable-libharfbuzz --enable-libvorbis
 --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb
 --disable-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 --enable-schannel --enable-sdl2 --enable-libsnappy --enable-
 libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-
 libuavs3d --disable-libdrm --enable-vaapi --enable-libvidstab --enable-
 vulkan --enable-libshaderc --enable-libplacebo --disable-libvvenc
 --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid
 --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC
 --extra-cxxflags= --extra-libs=-lgomp --extra-ldflags=-pthread --extra-
 ldexeflags= --cc=x86_64-w64-mingw32-gcc --cxx=x86_64-w64-mingw32-g++
 --ar=x86_64-w64-mingw32-gcc-ar --ranlib=x86_64-w64-mingw32-gcc-ranlib
 --nm=x86_64-w64-mingw32-gcc-nm --extra-version=20250323
   libavutil      59. 60.100 / 59. 60.100
   libavcodec     61. 33.102 / 61. 33.102
   libavformat    61.  9.107 / 61.  9.107
   libavdevice    61.  4.100 / 61.  4.100
   libavfilter    10.  9.100 / 10.  9.100
   libswscale      8. 13.103 /  8. 13.103
   libswresample   5.  4.100 /  5.  4.100
   libpostproc    58.  4.100 / 58.  4.100
 [hls @ 00000257b8f1be40] URL https://example.com/file.cmfv is not in
 allowed_extensions
 [in#0 @ 00000257b8eb9f40] Error opening input: Invalid data found when
 processing input
 Error opening input file C:\Users\REDACTED\file.m3u8.
 Error opening input files: Invalid data found when processing input
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11526>
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