[FFmpeg-devel] mpv+ffmpeg: [ffmpeg/video] h264: Late SEI is not implemented on 29.97 fps mp4 videos downloaded from youtube

[FFmpeg-devel] mpv+ffmpeg: [ffmpeg/video] h264: Late SEI is not implemented on 29.97 fps mp4 videos downloaded from youtube

[Stuart Little via ffmpeg-devel]

I am running

$ ffmpeg -version
ffmpeg version n8.0.1 Copyright (c) 2000-2025 the FFmpeg developers
built with gcc 15.2.1 (GCC) 20251112
configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libdvdnav --enable-libdvdread --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan
libavutil      60.  8.100 / 60.  8.100
libavcodec     62. 11.100 / 62. 11.100
libavformat    62.  3.100 / 62.  3.100
libavdevice    62.  1.100 / 62.  1.100
libavfilter    11.  4.100 / 11.  4.100
libswscale      9.  1.100 /  9.  1.100
libswresample   6.  1.100 /  6.  1.100

and

$ mpv --version
mpv v0.40.0-dirty Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Sep 24 2025 17:56:15
libplacebo version: v7.351.0
FFmpeg version: n8.0 (runtime n8.0.1)
FFmpeg library versions:
   libavcodec      62.11.100
   libavdevice     62.1.100
   libavfilter     11.4.100
   libavformat     62.3.100
   libavutil       60.8.100
   libswresample   6.1.100
   libswscale      9.1.100

Playing mp4 videos downloaded from youtube in formats running at 29.97 fps produce periodic yellow warnings:

[ffmpeg/video] h264: Late SEI is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[ffmpeg/video] h264: If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)

A sample file is available for download at [0] (to test, I actually need to download it; just running 'mpv <URL AT [0]>' produces other warnings). I have also uploaded that sample to https://streams.videolan.org/upload/, as instructed in the warning being reported here.

---

References:

[0] https://www.dropbox.com/scl/fi/l0hl39002ldqs5ugdc5nu/test1.mp4?rlkey=lqtd62261pq1web97nte7vm2s&dl=0
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