As requested, this is a h.265 re-encode of the original
h.264 release, this release
only has the commentary subs and audio tracks to help reduce the size further.
Look at
this reddit post for more info
What are the audio commentaries?The audio commentaries are secondary audio tracks present in the Monogatari Blu-rays and DVDs, that play over each episode of the anime. They feature a pair of characters discussing the episode as they're watching it... or more accurately, they tend to discuss everything but the episode. It's not just a chat between voice actors either : this is entirely in-character dialogue written by Nisio Isin. That's right, an entire 100 episodes worth of them !
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The files were merged using a utility called
MonoMuxSource:
VideoCommentary AudioCommentary Subs

ContactInformation:No information.