#11656: -bitexact does not remove metadata encoder tag in OGG Vorbis files -------------------------------------+------------------------------------- Reporter: Iwan | Type: defect Gabovitch | Status: new | Priority: normal Component: ffmpeg | Version: git- | master Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Summary of the bug: `-bitexact` removes the metadata encoder tag for wav, flac and mp3 files, but not for ogg files. Let's generate a wav: {{{ $ ffmpeg -f lavfi -i "sine=frequency=1000:duration=0.1:sample_rate=44100" -af "volume=0.2" input.wav ffmpeg version 2025-07-01-git-11d1b71c31-full_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers built with gcc 15.1.0 (Rev4, Built by MSYS2 project) configuration: --enable-gpl --enable-version3 --enable-static --disable- w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --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-libdvdnav --enable-libdvdread --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable- libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-liboapv --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable- libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable- libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --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-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-openal --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-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable- librubberband --enable-libsoxr --enable-chromaprint libavutil 60. 4.101 / 60. 4.101 libavcodec 62. 4.103 / 62. 4.103 libavformat 62. 1.101 / 62. 1.101 libavdevice 62. 0.100 / 62. 0.100 libavfilter 11. 0.100 / 11. 0.100 libswscale 9. 0.100 / 9. 0.100 libswresample 6. 0.100 / 6. 0.100 [out @ 00000187e0830640] The "sample_fmts" option is deprecated: set the supported sample formats [out @ 00000187e0830640] The "all_channel_counts" option is deprecated: accept all channel counts Input #0, lavfi, from 'sine=frequency=1000:duration=0.1:sample_rate=44100': Duration: N/A, start: 0.000000, bitrate: 705 kb/s Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s Stream mapping: Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help Output #0, wav, to 'input.wav': Metadata: ISFT : Lavf62.1.101 Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s Metadata: encoder : Lavc62.4.103 pcm_s16le [out#0/wav @ 00000187e082f500] video:0KiB audio:9KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.884354% size= 9KiB time=00:00:00.10 bitrate= 711.8kbits/s speed=58.7x elapsed=0:00:00.00 }}} Let's confirm the metadata: {{{ $ ffprobe.exe -hide_banner input.wav Input #0, wav, from 'input.wav': Metadata: encoder : Lavf62.1.101 Duration: 00:00:00.10, bitrate: 711 kb/s Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 1 channels, s16, 705 kb/s }}} Let's convert to flac with `-bitexact`: {{{ $ ffmpeg -hide_banner -i input.wav -bitexact output.flac [aist#0:0/pcm_s16le @ 00000205f2020900] Guessed Channel Layout: mono Input #0, wav, from 'input.wav': Metadata: encoder : Lavf62.1.101 Duration: 00:00:00.10, bitrate: 711 kb/s Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s Stream mapping: Stream #0:0 -> #0:0 (pcm_s16le (native) -> flac (native)) Press [q] to stop, [?] for help Output #0, flac, to 'output.flac': Stream #0:0: Audio: flac, 44100 Hz, mono, s16, 128 kb/s Metadata: encoder : Lavc flac [out#0/flac @ 00000205f2021bc0] video:0KiB audio:1KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 707.455013% size= 9KiB time=00:00:00.10 bitrate= 753.8kbits/s speed=42.3x elapsed=0:00:00.00 }}} Even though the output shows `encoder` `: Lavc flac`, it does not get written: {{{ $ ffprobe.exe -hide_banner output.flac Input #0, flac, from 'output.flac': Duration: 00:00:00.10, bitrate: 753 kb/s Stream #0:0: Audio: flac, 44100 Hz, mono, s16 }}} Let's convert to ogg with `-bitexact`: {{{ $ ffmpeg -hide_banner -i input.wav -bitexact output.ogg [aist#0:0/pcm_s16le @ 00000256f3f20900] Guessed Channel Layout: mono Input #0, wav, from 'input.wav': Metadata: encoder : Lavf62.1.101 Duration: 00:00:00.10, bitrate: 711 kb/s Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s Stream mapping: Stream #0:0 -> #0:0 (pcm_s16le (native) -> vorbis (libvorbis)) Press [q] to stop, [?] for help Output #0, ogg, to 'output.ogg': Stream #0:0: Audio: vorbis, 44100 Hz, mono, fltp Metadata: encoder : Lavc libvorbis [out#0/ogg @ 00000256f3f21bc0] video:0KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:3KiB muxing overhead: 743.708609% size= 4KiB time=00:00:00.10 bitrate= 305.8kbits/s speed=9.99x elapsed=0:00:00.01 }}} This time, the metadata is in the file: {{{ $ ffprobe.exe -hide_banner output.ogg Input #0, ogg, from 'output.ogg': Duration: 00:00:00.10, start: 0.000000, bitrate: 305 kb/s Stream #0:0: Audio: vorbis, 44100 Hz, mono, fltp, 80 kb/s Metadata: encoder : Lavc libvorbis }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/11656> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker