tatouage vidéo

Qu'est qu'on doit faire pour compresser un vidéo?

Answer 1

[Walter Roberson]

Which compression technique would you like to use?

Which operating system are you using? Most of the built-in video compression techniques are only available for Windows.

Answer 2

[Fiditiana TOLOJANAHARY]

J'utilise Windows 7. Je conçois un programme pour un tatouage vidéo, et on doit simuler une attaque avant l'extraction des marques. J'ai utilisé "avifile" pour la compression et je n'ai eu qu'une seul séquence du vidéo tatoué.

[Walter Roberson]

To compress the video on Windows 7, when you create the AVI file using http://www.mathworks.com/help/techdoc/ref/avifile.html avifile, specify the Compression option and try the codecs listed in the documentation.

I think the English equivalent of what you are trying to do is that you have a file that you have "watermarked", and that you want to simulate an attack on the file before extracting the "watermark". The English equivalent of the word you used, "tattoo", gives a nice mental image, but in English, a "watermark" is something that is not obvious unless you are looking for it, whereas "tattoo" in English is something that is usually fairly visible.

[Fiditiana TOLOJANAHARY]

I did what you proposed, so I'm not satisfied to the resultat. I've one frame not anyframes.

Answer 3

[Fiditiana TOLOJANAHARY]

En utilisant la fonction suivant, mon problème reste toujours le même: y=avifile('vidéoTatoué.avi','compression','None'); y = addframe(y,filename); y = close(y); Je n'ai eu que la première séquence du vidéo ("filename")