replace frame in video

Hi

I use matlab R2018b

I insert text as watermark in specific frame from video ( using DCT ) but I have some problem

1- I want to replace the original frame by the watermarked frame

2- the text that I can insert just one character (8 binary) how can I insert more

[Walter Roberson]

Remember that when you deal with videos, you might have compression in-between frames that might change the image enough that the watermark cannot be retrieved.

[LEKHCHINE Somia]

so do you have some suggestions that could help me

because I must insert the watermarked frame in the original video to keep proof

[Image Analyst]

Try http://www.visionbib.com/bibliography/image-proc136cod1.html

[Walter Roberson]

https://ieeexplore.ieee.org/abstract/document/4100627

[Walter Roberson]

https://www.spiedigitallibrary.org/conference-proceedings-of-spie/6072/60721A/Towards-robust-compressed-domain-video-watermarking-for-H264/10.1117/12.642535.short?SSO=1

[Walter Roberson]

https://dl.acm.org/citation.cfm?id=1854254

[LEKHCHINE Somia]

thank you so much