QT & FFMPEG encrypt & decrypt Video offline

Dara Alavi

I want encrypt & decrypt Video file With FFMPEG oflfine mode in hard disk.
I encrypt a Video File (mp4 Extention) by ffmpeg.exe Tools by this Command:

ffmpeg -i SampleVideo_1280x720_1mb.mp4 -vcodec copy -acodec copy
-encryption_scheme cenc-aes-ctr -encryption_key
76a6c65c5ea762046bd749a2e632ccbb -encryption_kid
a7e61c373e219033c21091fa607bf3b8 SampleVideo_1280x720_1mb_encrypted.mp4

for decryption : i want decrypt and play video file (encrypted.mp4) in my player source c++ (ffmpeg base) and now i dont wnat use decrypt file with command line with ffplay.exe *like this :

ffplay SampleVideo_1280x720_1mb_encrypted.mp4 -decryption_key
76a6c65c5ea762046bd749a2e632ccbb

I do not need ffplay.exe because i downloaded FFMPEG dev and i have written my own player program Which is based on FFMPEG! with QT & C++.
I dont want use ffplay.exe that exist static FFMPEG Folder. .
I want decrypt and play Encrypted File in my player program Through Programing code.

Now how to decrypt encrypted files using FFMPeg API with C++ Programing?

I searched a lot but did not find anything.
There is no explanation on how to use it. Frown | :(
I did not find a sample.. Frown | :(

thanks in advance.

mrjj

Hi
Could you not look at ffplay source code and see how it does ?

Bonnie

Since the encryption and decryption are purely by FFMPEG API and have nothing to do with Qt, I think it should be more efficient to ask that in some FFMPEG-related forums.

Dara Alavi

@mrjj said in QT & FFMPEG encrypt & decrypt Video offline:

Hi
Could you not look at ffplay source code and see how it does ?

Hi mate.
I saw it, but I could not understand how it did it.
Call different functions and library .

@Bonnie said in QT & FFMPEG encrypt & decrypt Video offline:

Since the encryption and decryption are purely by FFMPEG API and have nothing to do with Qt, I think it should be more efficient to ask that in some FFMPEG-related forums.

so can you tell use Why Qt support FFMPEG For Media Engine ? like this
[link text]https://doc.qt.io/archives/qtextended4.4/ffmpeg.html(link url)
Such a situation can happen to any library that works with Qt!
Both are open source, both based on C ++
There is no barrier when a project can be created with these conditions.
And if you understand the essence of the question, you can write the relevant program in the GUI interface.

Good luck..

Bonnie

@Dara-Alavi
It's a very old archived documentation. There's no Qt Extended anymore.
Anyway, if you insist, good luck with that then :)

Dara Alavi

@Bonnie said in QT & FFMPEG encrypt & decrypt Video offline:

It's a very old archived documentation. There's no Qt Extended anymore.
Anyway, if you insist, good luck with that then :)

It may be an old document, but it still works! FFMPEG & QT they does not get old, I insist on solving my problems, not running away from them. Good luck you too.

SGaist

Hi,

As shown in that example, you usually wrap the C API to integrate it with your C++ code.

Like the engine you saw in that old example, you have to implement a class that will encapsulate the calls to the ffmpeg API.

Follow the logic of the ffmpeg application and implement the various steps in your class.