#11405: Seeking on real time transcoded AVCI 100 file fails.
-------------------------------------+-------------------------------------
Reporter: Ankur | Type: defect
Bhatkalkar |
Status: new | Priority: normal
Component: | Version:
undetermined |
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
== Summary of the bug:
Our application requires some playback while recording for an AVC-I 100
mxf file and I am facing this issue when running some local tests with
ffmpeg. I run a transcode in real time which generates a growing mxf AVC-I
100 file and in another terminal I use ffplay to try and seek to a
position which is less than the duration that has been transcoded,
playback from the beginning of the file works as expected, but seeking
always fails with the clip always going to play from the beginning.
== How to reproduce:
This will require two terminals
In the first terminal within any arbitrary directory enter this command (
file has been attached for reference ), the input file should also be in
this current directory
{{{
ffmpeg -re -v 9 -loglevel 99 -report -i PermA_BuckBunny_1080i50.mov -c:v
libx264 -profile:v high422 -level:v 4.1 -b:v 100M -pix_fmt yuv422p10le
-x264opts force-cfr:keyint=1:min-keyint=1:avcintra-class=100:nal-hrd=cbr
-c:a pcm_s16le -ar 48000 -f mxf -write_index 1 output_avci.mxf
}}}
After the first command has run for more than 10s, open a second terminal
and within the same directory enter( currently seeking to 10s but this
could be any other value that works as long as it's within the duration
that has been transcoded )
{{{
ffplay -v 9 -loglevel 99 -report -probesize 100G -ss 10 output_avci.mxf
}}}
The logs show the error for the seek every single time, tried a different
range of options yet no success.
{{{
output_avci.mxf: could not seek to position 10.000
}}}
The ffmpeg and ffplay versions for the respective commands are( latest
static builds were used for this ):
{{{
./ffmpeg version
ffmpeg version N-118247-g19c95ecbff-20250106 Copyright (c) 2000-2025 the
FFmpeg developers
built with gcc 14.2.0 (crosstool-NG 1.26.0.120_4d36f27)
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static
--pkg-config=pkg-config --cross-prefix=x86_64-ffbuild-linux-gnu-
--arch=x86_64 --target-os=linux --enable-gpl --enable-version3 --disable-
debug --enable-iconv --enable-zlib --enable-libfreetype --enable-
libfribidi --enable-gmp --enable-libxml2 --enable-openssl --enable-lzma
--enable-fontconfig --enable-libharfbuzz --enable-libvorbis --enable-
opencl --enable-libpulse --enable-libvmaf --enable-libxcb --enable-xlib
--enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth
--enable-chromaprint --enable-libdav1d --enable-libdavs2 --enable-
libdvdread --enable-libdvdnav --disable-libfdk-aac --enable-ffnvcodec
--enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar
--enable-libaribcaption --enable-libass --enable-libbluray --enable-libjxl
--enable-libmp3lame --enable-libopus --enable-librist --enable-libssh
--enable-libtheora --enable-libvpx --enable-libwebp --enable-libzmq
--enable-lv2 --enable-libvpl --enable-openal --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg
--enable-libopenmpt --enable-librav1e --enable-librubberband --disable-
schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1
--enable-libtwolame --enable-libuavs3d --enable-libdrm --enable-vaapi
--enable-libvidstab --enable-vulkan --enable-libshaderc --enable-
libplacebo --disable-libvvenc --enable-libx264 --enable-libx265 --enable-
libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-
cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-libs='-ldl -lgomp'
--extra-ldflags=-pthread --extra-ldexeflags=-pie --cc=x86_64-ffbuild-
linux-gnu-gcc --cxx=x86_64-ffbuild-linux-gnu-g++ --ar=x86_64-ffbuild-
linux-gnu-gcc-ar --ranlib=x86_64-ffbuild-linux-gnu-gcc-ranlib --nm=x86_64
-ffbuild-linux-gnu-gcc-nm --extra-version=20250106
libavutil 59. 54.101 / 59. 54.101
libavcodec 61. 31.100 / 61. 31.100
libavformat 61. 9.104 / 61. 9.104
libavdevice 61. 4.100 / 61. 4.100
libavfilter 10. 6.101 / 10. 6.101
libswscale 8. 13.100 / 8. 13.100
libswresample 5. 4.100 / 5. 4.100
libpostproc 58. 4.100 / 58. 4.100
}}}
{{{
./ffplay version
ffplay version N-118247-g19c95ecbff-20250106 Copyright (c) 2003-2025 the
FFmpeg developers
built with gcc 14.2.0 (crosstool-NG 1.26.0.120_4d36f27)
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static
--pkg-config=pkg-config --cross-prefix=x86_64-ffbuild-linux-gnu-
--arch=x86_64 --target-os=linux --enable-gpl --enable-version3 --disable-
debug --enable-iconv --enable-zlib --enable-libfreetype --enable-
libfribidi --enable-gmp --enable-libxml2 --enable-openssl --enable-lzma
--enable-fontconfig --enable-libharfbuzz --enable-libvorbis --enable-
opencl --enable-libpulse --enable-libvmaf --enable-libxcb --enable-xlib
--enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth
--enable-chromaprint --enable-libdav1d --enable-libdavs2 --enable-
libdvdread --enable-libdvdnav --disable-libfdk-aac --enable-ffnvcodec
--enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar
--enable-libaribcaption --enable-libass --enable-libbluray --enable-libjxl
--enable-libmp3lame --enable-libopus --enable-librist --enable-libssh
--enable-libtheora --enable-libvpx --enable-libwebp --enable-libzmq
--enable-lv2 --enable-libvpl --enable-openal --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg
--enable-libopenmpt --enable-librav1e --enable-librubberband --disable-
schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1
--enable-libtwolame --enable-libuavs3d --enable-libdrm --enable-vaapi
--enable-libvidstab --enable-vulkan --enable-libshaderc --enable-
libplacebo --disable-libvvenc --enable-libx264 --enable-libx265 --enable-
libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-
cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-libs='-ldl -lgomp'
--extra-ldflags=-pthread --extra-ldexeflags=-pie --cc=x86_64-ffbuild-
linux-gnu-gcc --cxx=x86_64-ffbuild-linux-gnu-g++ --ar=x86_64-ffbuild-
linux-gnu-gcc-ar --ranlib=x86_64-ffbuild-linux-gnu-gcc-ranlib --nm=x86_64
-ffbuild-linux-gnu-gcc-nm --extra-version=20250106
libavutil 59. 54.101 / 59. 54.101
libavcodec 61. 31.100 / 61. 31.100
libavformat 61. 9.104 / 61. 9.104
libavdevice 61. 4.100 / 61. 4.100
libavfilter 10. 6.101 / 10. 6.101
libswscale 8. 13.100 / 8. 13.100
libswresample 5. 4.100 / 5. 4.100
libpostproc 58. 4.100 / 58. 4.100
}}}
Also attaching the ffmpeg and ffplay logs for when those commands were
run.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11405>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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