[FFmpeg-trac] #10270(ffmpeg:reopened): Random duration changes when transcoding ogg vorbis

[FFmpeg]

#10270: Random duration changes when transcoding ogg vorbis
------------------------------------+------------------------------------
             Reporter:  Ace17       |                    Owner:  (none)
                 Type:  defect      |                   Status:  reopened
             Priority:  normal      |                Component:  ffmpeg
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+------------------------------------
Comment (by Ace17):

 I've added "strange.wav", which makes the issue visible with the prebuilt
 Windows binaries.

 Here's the output I get.

 {{{
 #./repro.sh

 + uname -a
 MINGW64_NT-6.1-7601 SEBASTIENA 3.4.6.x86_64 2023-02-15 18:03 UTC x86_64
 Msys

 + ffmpeg -version
 ffmpeg version N-110043-gadb5f7b41f-20230318 Copyright (c) 2000-2023 the
 FFmpeg developers
 built with gcc 12.2.0 (crosstool-NG 1.25.0.90_cf9beb1)
 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-libxml2 --enable-zlib --enable-libfreetype
 --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig
 --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 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-
 llvm --enable-frei0r --enable-libgme --enable-libkvazaar --enable-libass
 --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-libopus
 --enable-librist --enable-libssh --enable-libtheora --enable-libvpx
 --enable-libwebp --enable-lv2 --disable-libmfx --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-libsoxr
 --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d
 --disable-libdrm --disable-vaapi --enable-libvidstab --enable-vulkan
 --enable-libshaderc --enable-libplacebo --enable-libx264 --enable-libx265
 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi
 --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-
 ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-
 version=20230318
 libavutil      58.  4.100 / 58.  4.100
 libavcodec     60.  6.101 / 60.  6.101
 libavformat    60.  4.100 / 60.  4.100
 libavdevice    60.  2.100 / 60.  2.100
 libavfilter     9.  4.100 /  9.  4.100
 libswscale      7.  2.100 /  7.  2.100
 libswresample   4. 11.100 /  4. 11.100
 libpostproc    57.  2.100 / 57.  2.100

 + ffmpeg -loglevel 1 -i strange.wav -acodec libvorbis -y sound1.ogg
 + ffmpeg -loglevel 1 -i sound1.ogg -acodec libvorbis -y sound2.ogg
 + ffmpeg -loglevel 1 -i sound2.ogg -acodec libvorbis -y sound3.ogg
 + ffmpeg -loglevel 1 -i sound3.ogg -acodec libvorbis -y sound4.ogg
 + ffmpeg -loglevel 1 -i sound4.ogg -acodec libvorbis -y sound5.ogg
 + ffmpeg -loglevel 1 -i sound5.ogg -acodec libvorbis -y sound6.ogg

 + for f in sound*.ogg
 + ffprobe -v error -show_entries format=duration -of
 default=noprint_wrappers=1:nokey=1 sound1.ogg
 1.000000
 + for f in sound*.ogg
 + ffprobe -v error -show_entries format=duration -of
 default=noprint_wrappers=1:nokey=1 sound2.ogg
 0.011519
 + for f in sound*.ogg
 + ffprobe -v error -show_entries format=duration -of
 default=noprint_wrappers=1:nokey=1 sound3.ogg
 1.004263
 + for f in sound*.ogg
 + ffprobe -v error -show_entries format=duration -of
 default=noprint_wrappers=1:nokey=1 sound4.ogg
 1.004263
 + for f in sound*.ogg
 + ffprobe -v error -show_entries format=duration -of
 default=noprint_wrappers=1:nokey=1 sound5.ogg
 1.004263
 + for f in sound*.ogg
 + ffprobe -v error -show_entries format=duration -of
 default=noprint_wrappers=1:nokey=1 sound6.ogg
 1.004263
 }}}

 Here, the durations are: 1.000000, 0.011519, 1.004263, 1.004263, 1.004263,
 1.004263

 You should be able to reproduce the issue on a Windows machine now.

 Best regards
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10270#comment:10>
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