[FFmpeg-trac] #10270(ffmpeg:reopened): Random duration changes when transcoding ogg vorbis
FFmpeg
trac at avcodec.org
Tue Mar 21 09:38:09 EET 2023
#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 |
------------------------------------+------------------------------------
Description changed by Ace17:
Old description:
> When repeatedly transcoding the same file from ogg to ogg, the duration
> of the generated file changes (see log below).
>
> How to reproduce:
> {{{
> #/usr/bin/env bash
> ffmpeg -loglevel 1 -i bizarre.wav -y sound1.ogg
> ffmpeg -loglevel 1 -i sound1.ogg -y sound2.ogg
> ffmpeg -loglevel 1 -i sound2.ogg -y sound3.ogg
> ffmpeg -loglevel 1 -i sound3.ogg -y sound4.ogg
> ffmpeg -loglevel 1 -i sound4.ogg -y sound5.ogg
> ffmpeg -loglevel 1 -i sound5.ogg -y sound6.ogg
>
> set +x
> for f in sound*.ogg ; do
> echo -n "$f :"
> ffprobe $f 2>&1 | grep start
> done
> }}}
>
> Output:
> {{{
> ffmpeg version 5.1.2-3 Copyright (c) 2000-2022 the FFmpeg developers
> built with gcc 12 (Debian 12.2.0-14)
> configuration: --prefix=/usr --extra-version=3 --toolchain=hardened
> --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu
> --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-
> ladspa --enable-libaom --enable-libass --enable-libbluray --enable-
> libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-
> libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype
> --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm
> --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-
> libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse
> --enable-librabbitmq --enable-librist --enable-librubberband --enable-
> libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-
> libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-
> libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx
> --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid
> --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-
> omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2
> --disable-sndio --enable-libjxl --enable-pocketsphinx --enable-librsvg
> --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883
> --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo
> --enable-librav1e --enable-shared
> libavutil 57. 28.100 / 57. 28.100
> libavcodec 59. 37.100 / 59. 37.100
> libavformat 59. 27.100 / 59. 27.100
> libavdevice 59. 7.100 / 59. 7.100
> libavfilter 8. 44.100 / 8. 44.100
> libswscale 6. 7.100 / 6. 7.100
> libswresample 4. 7.100 / 4. 7.100
> libpostproc 56. 6.100 / 56. 6.100
> + ffmpeg -loglevel 1 -i bizarre.wav -y sound1.ogg
> + ffmpeg -loglevel 1 -i sound1.ogg -y sound2.ogg
> + ffmpeg -loglevel 1 -i sound2.ogg -y sound3.ogg
> + ffmpeg -loglevel 1 -i sound3.ogg -y sound4.ogg
> + ffmpeg -loglevel 1 -i sound4.ogg -y sound5.ogg
> + ffmpeg -loglevel 1 -i sound5.ogg -y sound6.ogg
> + set +x
> sound1.ogg : Duration: 00:00:01.00, start: 0.000000, bitrate: 106 kb/s
> sound2.ogg : Duration: 00:00:00.01, start: 0.991293, bitrate: 8925 kb/s
> sound3.ogg : Duration: 00:00:01.00, start: 0.000000, bitrate: 97 kb/s
> sound4.ogg : Duration: 00:00:00.99, start: 0.010159, bitrate: 95 kb/s
> sound5.ogg : Duration: 00:00:00.99, start: 0.010159, bitrate: 97 kb/s
> sound6.ogg : Duration: 00:00:00.99, start: 0.010159, bitrate: 94 kb/s
> }}}
>
> The input wav here is exactly 1 second long.
> The duration of the generated files changes from 1.00 (ok), 0.99
> (okayyish) , 0.01 (what the?).
New description:
When repeatedly transcoding the same file from ogg to ogg, the duration of
the generated file changes (see log below).
Edit: the problem manifests itself with git-master prebuilt binaires,
however you have to use "bizarre.wav" to trigger it on GNU/Linux, and you
have to use "strange.wav" to trigger it on MS Windows.
How to reproduce:
{{{
#/usr/bin/env bash
ffmpeg -loglevel 1 -i bizarre.wav -y sound1.ogg
ffmpeg -loglevel 1 -i sound1.ogg -y sound2.ogg
ffmpeg -loglevel 1 -i sound2.ogg -y sound3.ogg
ffmpeg -loglevel 1 -i sound3.ogg -y sound4.ogg
ffmpeg -loglevel 1 -i sound4.ogg -y sound5.ogg
ffmpeg -loglevel 1 -i sound5.ogg -y sound6.ogg
set +x
for f in sound*.ogg ; do
echo -n "$f :"
ffprobe $f 2>&1 | grep start
done
}}}
Output:
{{{
ffmpeg version 5.1.2-3 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 12 (Debian 12.2.0-14)
configuration: --prefix=/usr --extra-version=3 --toolchain=hardened
--libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu
--arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-
ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b
--enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d
--enable-libflite --enable-libfontconfig --enable-libfreetype --enable-
libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-
libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg
--enable-libopenmpt --enable-libopus --enable-libpulse --enable-
librabbitmq --enable-librist --enable-librubberband --enable-libshine
--enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt
--enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame
--enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp
--enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
--enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal
--enable-opencl --enable-opengl --enable-sdl2 --disable-sndio --enable-
libjxl --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-
libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint
--enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e
--enable-shared
libavutil 57. 28.100 / 57. 28.100
libavcodec 59. 37.100 / 59. 37.100
libavformat 59. 27.100 / 59. 27.100
libavdevice 59. 7.100 / 59. 7.100
libavfilter 8. 44.100 / 8. 44.100
libswscale 6. 7.100 / 6. 7.100
libswresample 4. 7.100 / 4. 7.100
libpostproc 56. 6.100 / 56. 6.100
+ ffmpeg -loglevel 1 -i bizarre.wav -y sound1.ogg
+ ffmpeg -loglevel 1 -i sound1.ogg -y sound2.ogg
+ ffmpeg -loglevel 1 -i sound2.ogg -y sound3.ogg
+ ffmpeg -loglevel 1 -i sound3.ogg -y sound4.ogg
+ ffmpeg -loglevel 1 -i sound4.ogg -y sound5.ogg
+ ffmpeg -loglevel 1 -i sound5.ogg -y sound6.ogg
+ set +x
sound1.ogg : Duration: 00:00:01.00, start: 0.000000, bitrate: 106 kb/s
sound2.ogg : Duration: 00:00:00.01, start: 0.991293, bitrate: 8925 kb/s
sound3.ogg : Duration: 00:00:01.00, start: 0.000000, bitrate: 97 kb/s
sound4.ogg : Duration: 00:00:00.99, start: 0.010159, bitrate: 95 kb/s
sound5.ogg : Duration: 00:00:00.99, start: 0.010159, bitrate: 97 kb/s
sound6.ogg : Duration: 00:00:00.99, start: 0.010159, bitrate: 94 kb/s
}}}
The input wav here is exactly 1 second long.
The duration of the generated files changes from 1.00 (ok), 0.99
(okayyish) , 0.01 (what the?).
--
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10270#comment:11>
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