It will surely be noticed, but after a broken segment I want to keep everything starting from the next semi-valid delta frame.
Anyway, turns out it can be done with Avidemux (though manually).
For each good segment I set markers and direct-copied to a new file, then finally joined them all.
Apparently copying raw frame data as-is is possible even when the range markers are on non-I frames.
And a correction: it actually wasn't H264, it's MPEG4 part 2, maybe ASP.
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