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"James Harris" wrote ...
> I cannot find either free or to-pay-for video editing software that
> makes a virtue of being lossless. Of course, only DV can be fully
> lossless. Mpeg can be almost lossless. Some 'stitching' would normally
> be required to maintain the GOP round edits but the effect would be
> minor and localised.
>
> In the absence of suggestions for a pre-built lossless editor I'm
> turning to the programming newsgroups.
>
> Anyone know of DV and Mpeg libraries that can be used for lossless
> frame-accurate processing?

Not clear what you are asking for? Are you an end-user looking for
a video editing application? Are you a computer programmer
looking for software libraries for video datastream handling?

As was mentioned, "lossless frame-accurate" editing is not really
possible in any temporally-compressed codec (which means virtually
all MPEG flavors). DV, of course, is NOT temporally-compressed.