Hello, I am interested in storing custom metadata on a per frame level in a mov or mp4 file. It looks like using user data unregistered (UDU) supplemental enhancement information (SEI) may be a suitable approach for this. I am however struggling to get this to work as I am always reading back the custom message I used for the first frame.
Below is a basic change I made to the mux.c and demux_decode.c examples from ffmpeg that shows my attempt: https://gist.github.com/tvercaut/94c68e46d0d0321a2c83b88024d9cd69/revisions Essentially, I have tried to use `av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_SEI_UNREGISTERED, my_sei_buffer);` at muxing time and `av_frame_get_side_data(frame, AV_FRAME_DATA_SEI_UNREGISTERED);` at demuxing/decoding time. I also realised I had to set the `udu_sei` flag when muxing: `av_dict_set_int(&opt, "udu_sei", 1, 0);` I have looked for additional material / documentation on how to do this but couldn't find a lot. Am I missing a key step here? Also, is there a way to display the UDU SEI messages using ffmpeg or ffprobe command line tools? I tried using `ffmpeg -i test.mov -vf showinfo -f null -` but this doesn't display the content to the UDU SEI messages I provided. P.S.: This is a bit of a follow-up from an old post of mine but trying a different approach for per-frame metadata: https://lists.ffmpeg.org/pipermail/libav-user/2022-April/013051.html Best wishes, Tom
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