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I raise such problem but in the same post I raise the solution.

The first thing to know is that the .camrec format (from Camtasia) is a compressed file, so we must first decompress these files before converting them to .mp4.

Using 7z it is possible to decompress a .camrec file, and generate a .avi:

7z e "*file.camrec" "file.avi"

The second thing, is to convert this .avi file to .mp4 with ffmpeg.

ffmpeg -i "file.avi" "file.mp4"

If someone has a better solution I invite you to post it here.

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Camtasia file format is a colsed and composed file with multiple assets and instructions called MS-CFB. The binary header does not correspond to 7zip, rar, zip or gzip. You can not conver .camrec from ffmpeg or unzip.

In Microsoft website says: https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-cfb/68530324-9d3d-4441-9ea9-66a2c8f79567

[MS-CFB]: Compound File Binary File Format

000000: D0CF 11E0 A1B1 1AE1 0000 0000 0000 0000 ................

And i have a .camrec file for the example:

whk@machine:~/Vídeos$ file fest.camrec;
fest.camrec: Composite Document File V2 Document, Cannot read section info
whk@machine:~/Vídeos$ head -n 16 fest.camrec | xxd;
00000000: d0cf 11e0 a1b1 1ae1 0000 0000 0000 0000  ................

The best option is download Camtasia Studio and install it on a Windows machine and export the project as video file format.

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