There is some trouble in extracting watermark

[Asuka96]

I was trying to embed a txt file with information to a video with this command:
“embed dwt-window-median -i test.mp4 -o embedV.mp4 -w message.txt -t bit-file”
and got this
┌─────────────── DwtWindowMedian ───────────────┐
│ Total frames │ 1179 │
│ Embedded │ 109.00 B │
│ Embedded bits │ 872 │
│ Copied frames │ 1178 │
│ Frames with watermark │ 1 │
│ Full watermark │ True │
│ Start time │ 2021-06-01 21:23:21 │
│ End time │ 2021-06-01 21:23:50 │
│ Elapsed time │ 0:00:29 │
└───────────────────────────────────────────────┘
Then I used this command to extract information from the video， but I only got some garbled
extract dwt-window-median -i embededV.mp4 -o extract.txt -t bit-file -q 872

Is there a right way to embed and extract the watermark and get a correct result？

Thanks a lot