[FFmpeg-trac] #10157(undetermined:new): Behavior of map_metadata -1 no longer strips metadata as expected
FFmpeg
trac at avcodec.org
Sat Jan 28 04:20:51 EET 2023
#10157: Behavior of map_metadata -1 no longer strips metadata as expected
-------------------------------------+-------------------------------------
Reporter: migan10 | Type: defect
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
Until recently, using "-map_metadata -1" would strip all metadata from an
input file, including global and stream metadata (excepting bitstream
metadata). Now, using -map_metadata -1 seems to have no effect or may just
affect global metadata. I can't figure out the correct method to strip
metadata from individual streams, if there is one.
I have run a bisect and the responsible commit is here, from November
2022:
https://github.com/FFmpeg/FFmpeg/commit/41194806812a31d25e24c535fcb92d7d97b8ce9d
How to reproduce:
Simply try using -map_metadata -1 with any input file that has metadata on
any of the streams. May potentially be specific to mkv muxer, as that's
all I've tested with. In example below you can see the metadata reappear
in the output file details despite setting -map_metadata -1.
{{{
% ffmpeg -i in.mkv -map_metadata -1 -map_chapters -1 -c copy -y out.mkv
ffmpeg version N-109647-gba36e6ed52 Copyright (c) 2000-2023 the FFmpeg
developers
built with gcc 12 (Debian 12.2.0-13)
configuration: --disable-ffplay --disable-doc --prefix=/opt/ffmpeg/build
--pkg-config-flags=--static --extra-cflags='-I/opt/ffmpeg/build/include
-I/usr/include/samba-4.0 -march=native' --extra-
ldflags=-L/opt/ffmpeg/build/lib --extra-libs='-lpthread -lm'
--bindir=/opt/ffmpeg/bin --enable-gpl --enable-version3 --enable-libaom
--enable-libass --enable-libfdk-aac --enable-libfreetype --enable-
libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-
libx264 --enable-libx265 --enable-nonfree --enable-libcaca --enable-
libaribb24 --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-
libgme --enable-libgsm --enable-libopencore-amrnb --enable-libopencore-
amrwb --enable-libopenjpeg --enable-libpulse --enable-librtmp --enable-
librubberband --enable-libsnappy --enable-libspeex --enable-libtheora
--enable-libtwolame --enable-libvidstab --enable-libwebp --enable-libxvid
--enable-lv2 --enable-opencl --enable-libdrm --enable-cuda-nvcc --enable-
openssl --enable-ffnvcodec --enable-nvenc --enable-nvdec --enable-libnpp
--enable-libzimg --enable-libzvbi --enable-libxml2 --enable-
filter=scale_cuda --enable-libvmaf
libavutil 57. 44.100 / 57. 44.100
libavcodec 59. 56.100 / 59. 56.100
libavformat 59. 35.100 / 59. 35.100
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 54.100 / 8. 54.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
libpostproc 56. 7.100 / 56. 7.100
Input #0, matroska,webm, from 'in.mkv':
Metadata:
ENCODER : Lavf59.35.100
Duration: 00:25:26.43, start: 0.000000, bitrate: 2743 kb/s
Chapters:
Chapter #0:0: start 0.000000, end 739.805733
Metadata:
title : Chapter 01
Chapter #0:1: start 739.805733, end 1526.424900
Metadata:
title : Chapter 02
Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, progressive),
710x480 [SAR 8:9 DAR 71:54], 59.94 fps, 59.94 tbr, 1k tbn
Metadata:
ENCODER : Lavc59.56.100 hevc_nvenc
DURATION : 00:25:26.425000000
Stream #0:1(eng): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default)
Metadata:
title : Stereo
BPS-eng : 192000
DURATION-eng : 00:25:26.400000000
NUMBER_OF_FRAMES-eng: 47700
NUMBER_OF_BYTES-eng: 36633600
SOURCE_ID-eng : 0180BD
_STATISTICS_WRITING_APP-eng: MakeMKV v1.17.2 linux(x64-release)
_STATISTICS_WRITING_DATE_UTC-eng: 2023-01-27 07:48:22
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
SOURCE_ID
DURATION : 00:25:26.400000000
Stream #0:2(eng): Subtitle: ass (default)
Metadata:
BPS-eng : 436
DURATION-eng : 00:24:56.962000000
NUMBER_OF_FRAMES-eng: 835
NUMBER_OF_BYTES-eng: 81624
SOURCE_ID-eng : 0100E0
_STATISTICS_WRITING_APP-eng: MakeMKV v1.17.2 linux(x64-release)
_STATISTICS_WRITING_DATE_UTC-eng: 2023-01-27 07:48:22
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
SOURCE_ID
ENCODER : Lavc59.56.100 ssa
DURATION : 00:24:58.596000000
Output #0, matroska, to 'out.mkv':
Metadata:
encoder : Lavf59.35.100
Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, progressive),
710x480 [SAR 8:9 DAR 71:54], q=2-31, 59.94 fps, 59.94 tbr, 1k tbn
Metadata:
ENCODER : Lavc59.56.100 hevc_nvenc
DURATION : 00:25:26.425000000
Stream #0:1(eng): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo,
fltp, 192 kb/s (default)
Metadata:
title : Stereo
BPS-eng : 192000
DURATION-eng : 00:25:26.400000000
NUMBER_OF_FRAMES-eng: 47700
NUMBER_OF_BYTES-eng: 36633600
SOURCE_ID-eng : 0180BD
_STATISTICS_WRITING_APP-eng: MakeMKV v1.17.2 linux(x64-release)
_STATISTICS_WRITING_DATE_UTC-eng: 2023-01-27 07:48:22
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
SOURCE_ID
DURATION : 00:25:26.400000000
Stream #0:2(eng): Subtitle: ass (default)
Metadata:
BPS-eng : 436
DURATION-eng : 00:24:56.962000000
NUMBER_OF_FRAMES-eng: 835
NUMBER_OF_BYTES-eng: 81624
SOURCE_ID-eng : 0100E0
_STATISTICS_WRITING_APP-eng: MakeMKV v1.17.2 linux(x64-release)
_STATISTICS_WRITING_DATE_UTC-eng: 2023-01-27 07:48:22
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
SOURCE_ID
ENCODER : Lavc59.56.100 ssa
DURATION : 00:24:58.596000000
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Stream #0:2 -> #0:2 (copy)
Press [q] to stop, [?] for help
frame=54550 fps=36267 q=-1.0 size= 298240kB time=00:15:10.02
bitrate=2684.7kbits/s speed= 605x
}}}
Patches should be submitted to the ffmpeg-devel mailing list and not this
bug tracker.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10157>
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