[FFmpeg-trac] #11527(ffmpeg:new): When using tee to live stream to youtube - image that is streamed on youtube changes aspect ratio

[FFmpeg]

#11527: When using tee to live stream to youtube - image that is streamed on
youtube changes aspect ratio
----------------------------------+--------------------------------------
             Reporter:  bojanv55  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  ffmpeg    |                  Version:  git-master
             Keywords:  tee       |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+--------------------------------------
 Summary of the bug:
 When using tee to stream image+audio to youtube, image aspect ratio is
 changed on youtube stream. If other tee destination fails during the
 process, image ratio is OK. Also if I do not use tee, image aspect ratio
 is normal. So it only happens when there are 2 destinations working and
 only on youtube live stream (local file is OK).

 How to reproduce:
 {{{
 This fails:

 "C:\Users\default.DESKTOP-TKUK8H2\Downloads\ffmpeg-master-latest-win64
 -gpl-shared\bin\ffmpeg.exe" -y -loop 1 -i "C:\Users\default.DESKTOP-
 TKUK8H2\Documents\coverhd1p.png" -i "http://livestream.me:8010/livestream"
 -c:v libx264 -preset ultrafast -pix_fmt yuv420p -minrate 6000k -maxrate
 6000k -bufsize 12000k -b:v 6000k -r 30 -g 30 -keyint_min 60 -x264opts
 keyint=60:min-keyint=60:no-scenecut -s 1280x720 -tune zerolatency -b:a
 128k -c:a aac -ar 48000 -strict experimental -drop_pkts_on_overflow 1
 -attempt_recovery 1 -recover_any_error 1 -recovery_wait_time 1 -map 0:v
 -map 1:a -f tee
 "[f=flv:select=\'a:0,v:0\']rtmp://a.rtmp.youtube.com/live2/mycode|[f=flv:select=\'a:0\']output1.flv"

 This works:

 "C:\Users\default.DESKTOP-TKUK8H2\Downloads\ffmpeg-master-latest-win64
 -gpl-shared\bin\ffmpeg.exe" -y -loop 1 -i "C:\Users\default.DESKTOP-
 TKUK8H2\Documents\coverhd1p.png" -i "http://livestream.me:8010/livestream"
 -c:v libx264 -preset ultrafast -pix_fmt yuv420p -minrate 6000k -maxrate
 6000k -bufsize 12000k -b:v 6000k -r 30 -g 30 -keyint_min 60 -x264opts
 keyint=60:min-keyint=60:no-scenecut -s 1280x720 -tune zerolatency -b:a
 128k -c:a aac -ar 48000 -strict experimental -drop_pkts_on_overflow 1
 -attempt_recovery 1 -recover_any_error 1 -recovery_wait_time 1 -map 0:v
 -map 1:a -f flv rtmp://a.rtmp.youtube.com/live2/mycode
 }}}

 [[Image(https://i.postimg.cc/262QsfHF/wrong-aspect-ratio.jpg)]]

 {{{
 C:\Users\default.DESKTOP-TKUK8H2>"C:\Users\default.DESKTOP-
 TKUK8H2\Downloads\ffmpeg-master-latest-win64-gpl-shared\bin\ffmpeg.exe"
 -version
 ffmpeg version N-118905-gcbbc927a67-20250324 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
 --enable-shared --disable-static --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=20250324
 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
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11527>
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