I'm not sure if that is the proper place, or way, to split samples.
Also I couldn't find a way to make a sensible Wine test for this. AFAIU you can only get the larger sample sizes when using variable block length encoding, which ffmpeg (or other free encoders that I could find) doesn't support. I did hack `test_sync_reader_streaming()` to check what happens on Windows with the game video, and that's where I got the max capacity value I use in the patch.