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  1. Hello
    All Freinds Please Help ME:
    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:

    f
    Code:
    fmpeg -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 :
    Code:
    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.

    I look at ffplay source code it, but I could not understand how it did it.
    Call different functions and library .

    There is no explanation on how to use it. Frown |
    I did not find a sample.. Frown |

    thanks in advance.
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  2. Member metis's Avatar
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    @dara.alavi

    i have written my own player program Which is based on FFMPEG!
    #MeToo, but mine is entirely written with Lazarus/FreePascal (FPC), see FFPlay4Laz.
    Currently, I'm updating the entire Code to 'SDL2' to make the Player even faster.


    how to decrypt encrypted files using FFMPeg API with C++ Programing?
    Suppose, You're App already opens, decodes and syncs the Streams.
    I have no Idea about Decryption by Code (yet), because my Player doesn't use it, but maybe this helps You:
    see [../libavcodec/avcodec.h] -> AV_PKT_DATA_ENCRYPTION_INFO:
    "This side data contains encryption info for how to decrypt the packet.
    ..., use av_encryption_info_* methods to access."


    I look at ffplay source code...
    'ffplay.c' has no DecryptionCode.
    Last edited by metis; 17th Feb 2021 at 06:32.
    Life could be so easy, if there weren't those f*** Details.
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  3. Member metis's Avatar
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    @dara.alavi

    I did a little Research for You.
    Decrypting is Part of FFmpeg's AVOptions, so what You need is av_opt_set().

    Should be something like av_opt_set(YourCodecContext, "decryption_key", "YourDecryptionKey", AV_OPT_FLAG_DECODING_PARAM).
    (I didn't try it out - Tell me/us, if it works.)

    For CodeSamples for 'av_opt_set()', see here:
    https://cpp.hotexamples.com/examples/-/-/av_opt_set/cpp-av_opt_set-function-examples.html

    BTW: The FFmpeg-Sources for En-/Decryption are in:
    [..\libavformat\isom.h], [..\libavformat\crypto.c] and [..\libavformat\mov.c].
    Life could be so easy, if there weren't those f*** Details.
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