[FFmpeg-trac] #7864(undetermined:new): FFmpeg (possibly libavformat) seems not to write the correct duration when remuxing a FLAC file with seeking.
FFmpeg
trac at avcodec.org
Wed Apr 24 12:50:14 EEST 2019
#7864: FFmpeg (possibly libavformat) seems not to write the correct duration when
remuxing a FLAC file with seeking.
-------------------------------------+-------------------------------------
Reporter: pbelkner | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
FFmpeg (possibly libavformat) seems not to write the correct duration when
remuxing a FLAC file with seeking.
How to reproduce:
1.) Run FFmpeg on a FLAC file with option acodec set to copy and option ss
set to e.g. 1:0 (one second), e.g.
{{{
peter at debian-9:~$ ffmpeg -i ~/aerosmith/1973_make_it/01_make_it.flac
-acodec copy -ss 1:0 -y xx/01_make_it.flac
ffmpeg version 3.2.12-1~deb9u1 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
configuration: --prefix=/usr --extra-version='1~deb9u1'
--toolchain=hardened --libdir=/usr/lib/i386-linux-gnu
--incdir=/usr/include/i386-linux-gnu --enable-gpl --disable-stripping
--enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libebur128 --enable-libflite --enable-
libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme
--enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-
libopenmpt --enable-libopus --enable-libpulse --enable-librubberband
--enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex
--enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265
--enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-
openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-
libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv
--enable-libx264 --enable-shared
libavutil 55. 34.101 / 55. 34.101
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.101 / 57. 56.101
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libavresample 3. 1. 0 / 3. 1. 0
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
Input #0, flac, from '~/aerosmith/1973_make_it/01_make_it.flac':
Metadata:
COMMENT : level: +4.00 dB, track: -0.86 dB, album: -1.22 dB
ARTIST : Aerosmith
ALBUM : Make It
DATE : 1973
TITLE : Make It
REPLAYGAIN_ALGORITHM: EBU R128
REPLAYGAIN_REFERENCE_LOUDNESS: -23 LUFS
REPLAYGAIN_TRACK_GAIN: -10.3 LU
REPLAYGAIN_TRACK_PEAK: 0.956400
REPLAYGAIN_ALBUM_GAIN: -10.1 LU
REPLAYGAIN_ALBUM_PEAK: 0.987564
ENCODER : Lavf52.93.0
Duration: 00:03:41.00, start: 0.000000, bitrate: 853 kb/s
Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
Side data:
replaygain: track gain - -10.300000, track peak - 0.000022, album
gain - -10.100000, album peak - 0.000023,
Output #0, flac, to 'xx/01_make_it.flac':
Metadata:
DESCRIPTION : level: +4.00 dB, track: -0.86 dB, album: -1.22 dB
ARTIST : Aerosmith
ALBUM : Make It
DATE : 1973
TITLE : Make It
REPLAYGAIN_ALGORITHM: EBU R128
REPLAYGAIN_REFERENCE_LOUDNESS: -23 LUFS
REPLAYGAIN_TRACK_GAIN: -10.3 LU
REPLAYGAIN_TRACK_PEAK: 0.956400
REPLAYGAIN_ALBUM_GAIN: -10.1 LU
REPLAYGAIN_ALBUM_PEAK: 0.987564
encoder : Lavf57.56.101
Stream #0:0: Audio: flac, 44100 Hz, stereo (16 bit)
Side data:
replaygain: track gain - -10.300000, track peak - 0.000022, album
gain - -10.100000, album peak - 0.000023,
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size= 16736kB time=00:02:40.96 bitrate= 851.8kbits/s speed= 265x
video:0kB audio:16728kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.050387%
peter at debian-9:~$
}}}
2.) Even if FFmpeg claims that the result is one second shorter as the
input (i.e. time=00:02:40.96) this is not written to the result:
{{{
peter at debian-9:~$ ffmpeg -i ~/aerosmith/1973_make_it/01_make_it.flac
-acodec copy -ss 1:0 -y xx/01_make_it.flac
ffmpeg version 3.2.12-1~deb9u1 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
configuration: --prefix=/usr --extra-version='1~deb9u1'
--toolchain=hardened --libdir=/usr/lib/i386-linux-gnu
--incdir=/usr/include/i386-linux-gnu --enable-gpl --disable-stripping
--enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libebur128 --enable-libflite --enable-
libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme
--enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-
libopenmpt --enable-libopus --enable-libpulse --enable-librubberband
--enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex
--enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265
--enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-
openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-
libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv
--enable-libx264 --enable-shared
libavutil 55. 34.101 / 55. 34.101
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.101 / 57. 56.101
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libavresample 3. 1. 0 / 3. 1. 0
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
Input #0, flac, from '~/aerosmith/1973_make_it/01_make_it.flac':
Metadata:
COMMENT : level: +4.00 dB, track: -0.86 dB, album: -1.22 dB
ARTIST : Aerosmith
ALBUM : Make It
DATE : 1973
TITLE : Make It
REPLAYGAIN_ALGORITHM: EBU R128
REPLAYGAIN_REFERENCE_LOUDNESS: -23 LUFS
REPLAYGAIN_TRACK_GAIN: -10.3 LU
REPLAYGAIN_TRACK_PEAK: 0.956400
REPLAYGAIN_ALBUM_GAIN: -10.1 LU
REPLAYGAIN_ALBUM_PEAK: 0.987564
ENCODER : Lavf52.93.0
Duration: 00:03:41.00, start: 0.000000, bitrate: 853 kb/s
Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
Side data:
replaygain: track gain - -10.300000, track peak - 0.000022, album
gain - -10.100000, album peak - 0.000023,
Output #0, flac, to 'xx/01_make_it.flac':
Metadata:
DESCRIPTION : level: +4.00 dB, track: -0.86 dB, album: -1.22 dB
ARTIST : Aerosmith
ALBUM : Make It
DATE : 1973
TITLE : Make It
REPLAYGAIN_ALGORITHM: EBU R128
REPLAYGAIN_REFERENCE_LOUDNESS: -23 LUFS
REPLAYGAIN_TRACK_GAIN: -10.3 LU
REPLAYGAIN_TRACK_PEAK: 0.956400
REPLAYGAIN_ALBUM_GAIN: -10.1 LU
REPLAYGAIN_ALBUM_PEAK: 0.987564
encoder : Lavf57.56.101
Stream #0:0: Audio: flac, 44100 Hz, stereo (16 bit)
Side data:
replaygain: track gain - -10.300000, track peak - 0.000022, album
gain - -10.100000, album peak - 0.000023,
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size= 16736kB time=00:02:40.96 bitrate= 851.8kbits/s speed= 265x
video:0kB audio:16728kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.050387%
peter at debian-9:~$
peter at debian-9:~$ ffmpeg -i ./xx/01_make_it.flac
ffmpeg version 3.2.12-1~deb9u1 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
configuration: --prefix=/usr --extra-version='1~deb9u1'
--toolchain=hardened --libdir=/usr/lib/i386-linux-gnu
--incdir=/usr/include/i386-linux-gnu --enable-gpl --disable-stripping
--enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libebur128 --enable-libflite --enable-
libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme
--enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-
libopenmpt --enable-libopus --enable-libpulse --enable-librubberband
--enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex
--enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265
--enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-
openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-
libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv
--enable-libx264 --enable-shared
libavutil 55. 34.101 / 55. 34.101
libavcodec 57. 64.101 / 57. 64.101
libavformat 57. 56.101 / 57. 56.101
libavdevice 57. 1.100 / 57. 1.100
libavfilter 6. 65.100 / 6. 65.100
libavresample 3. 1. 0 / 3. 1. 0
libswscale 4. 2.100 / 4. 2.100
libswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
Input #0, flac, from './xx/01_make_it.flac':
Metadata:
comment : level: +4.00 dB, track: -0.86 dB, album: -1.22 dB
ARTIST : Aerosmith
ALBUM : Make It
DATE : 1973
TITLE : Make It
REPLAYGAIN_ALGORITHM: EBU R128
REPLAYGAIN_REFERENCE_LOUDNESS: -23 LUFS
REPLAYGAIN_TRACK_GAIN: -10.3 LU
REPLAYGAIN_TRACK_PEAK: 0.956400
REPLAYGAIN_ALBUM_GAIN: -10.1 LU
REPLAYGAIN_ALBUM_PEAK: 0.987564
ENCODER : Lavf57.56.101
Duration: 00:03:41.00, start: 60.000363, bitrate: 620 kb/s
Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
Side data:
replaygain: track gain - -10.300000, track peak - 0.000022, album
gain - -10.100000, album peak - 0.000023,
At least one output file must be specified
peter at debian-9:~$
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7864>
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