#10761: Wrong container flags on .avi muxing; ignoring interlaced flag
-------------------------------------+-------------------------------------
Reporter: Selur | Type: defect
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: avi muxing | Blocked By:
interlaced signaling |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
How to reproduce:
{{{
1. Take a file with audio and video create separate audio and a video
files
ffmpeg -y -threads 8 -i "C:\Users\Selur\Desktop\random.avi" -map 0:1 -vn
-sn -ac 2 -ar 96000 -acodec pcm_s16le -f wav -map_metadata -1
"J:\tmp\audio.wav"
ffmpeg -y -noautorotate -nostdin -threads 8 -i
"C:\Users\Selur\Desktop\HuffInterlaced.avi" -map 0:0 -an -sn -vf
zscale=rangein=tv:range=tv,setfield=tff -pix_fmt yuv444p -vsync 0 -top 1
-vcodec ffvhuff -coder 0 -context 0 -non_deterministic true -flags
+ildct+ilme -top 1"J:\tmp\HuffInterlaced.avi"
2. multiplex those two files:
ffmpeg -y -r 30000/1001 -fflags +genpts -i "J:\tmp\HuffInterlaced.avi"
-top 1 -flags +ildct+ilme -i "J:\tmp\audio.wav" -c:0 copy -c:1 copy -map
0:0 -map 1:0 -aspect 720:480 -r 30000/1001 -f avi
"G:\Output\HuffInterlaced_broken.avi"
3. Checking the flags with mediainfo
mediainfo "G:\Output\HuffInterlaced_broken.avi"
you get:
...
Scan type : Progressive
Original scan type : Interlaced
...
which indicates that the container is flagged progressive and the video
stream is (properly) flagged interlaced. ("J:\tmp\HuffInterlaced.avi" is
properly flagged)
ffmpeg version N-113102-gff85dcf033-g0c6203c97a+2 Copyright (c) 2000-2023
the FFmpeg developers
built with gcc 13.2.0 (Rev3, Built by MSYS2 project)
configuration: --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache
g++' --ld='ccache g++' --extra-cxxflags=-fpermissive --extra-cflags=-Wno-
int-conversion --disable-autodetect --enable-amf --enable-bzlib --enable-
cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv
--enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-
ffnvcodec --enable-nvdec --enable-cuda-llvm --disable-doc --enable-
libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-
libx264 --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug
--enable-fontconfig --enable-libass --enable-libbluray --enable-
libfreetype --enable-libmfx --enable-libmysofa --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvidstab --enable-libvo-amrwbenc --enable-libwebp --enable-
libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth
--enable-libxvid --enable-libopenmpt --enable-version3 --enable-librav1e
--enable-libsrt --enable-libgsm --enable-libvmaf --enable-libsvtav1
--enable-mbedtls --extra-cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++
--extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads
libavutil 58. 36.100 / 58. 36.100
libavcodec 60. 36.100 / 60. 36.100
libavformat 60. 20.100 / 60. 20.100
libavdevice 60. 4.100 / 60. 4.100
libavfilter 9. 14.101 / 9. 14.101
libswscale 7. 6.100 / 7. 6.100
libswresample 4. 13.100 / 4. 13.100
libpostproc 57. 4.100 / 57. 4.100
build using: https://github.com/m-ab-s/media-autobuild_suite on Windows 11
64bit.
}}}
Reencoding the video stream would either change the coder and context
choice or require the knowledge of which coder and context were used.
I expected that even without having set '-top 1 -flags +ildct+ilme' in the
muxing call, that ffmpeg would recognize that the input is interlaced and
keep the interlaced signaling of the container.
As a try of a workaround I added '-top 1 -flags +ildct+ilme' to let ffmpeg
know that the video is interlaced, but that seems to get silently ignored.
Would be nice if this could be fixed.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10761>
FFmpeg <https://ffmpeg.org>
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