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Reverse Engineering CapCut's Encrypted Video Cache (BDVE Type 1) and Building an Open-Source Solver

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If you've ever inspected the local draft directory of CapCut or JianYing (ByteDance's video editors), you might have noticed video cache files taking up hundreds of megabytes in folders like Resources/combination or Resources/videoAlg. Naturally, you might try opening one with VLC, QuickTime, or running: ffmpeg -i 48C34141-8F08-4483-A597-073963B3DB0A_video.mp4 output.mp4 Only to be greeted by this demuxer error: [mov,mp4-m4a-3gp-3g2-mj2 @ 0x7fa2b00] moov atom not found Invalid data found when processing input The file size on disk is complete (e.g. 50 MB, 1 GB), yet neither VLC nor FFmpeg can

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