Submitting Video Evidence In Court - Which File Format?

Watermarking of video files can almost always be applied to a particular VMS's database exports which are generally viewed only in their native Viewer (i.e. the file format is proprietary - it can't be viewed in WMP or VLC).

This watermarking of native files is almost always sold as the preferred method of exporting files, especially as part of a 'chain of evidence' scheme designed to retain data validity when the video is used as evidence in court. The claim I've heard against .AVI is that it can be challenged.

My question is this: Has anyone ever had a defense lawyer (or anyone else) successfully challenge the validity of video in an .AVI file format when submitted as evidence?

I get that technically someone with skills could edit an .AVI file, but do defense lawyers even understand the technology involved to challenge the format - and has it ever happened?

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