It mentions that these movies use the multi-angling feature to substitute translated text into frames of the movies and that screws things up. However, it says ddrescue should work in this case, but in testing both gddrescue and ddrescue I found neither produced usable images.
There are references to several of these movies in this thread: http:// forum.doom9. org/archive/ index.php/ t-157734. html
It mentions that these movies use the multi-angling feature to substitute translated text into frames of the movies and that screws things up. However, it says ddrescue should work in this case, but in testing both gddrescue and ddrescue I found neither produced usable images.