download MKV2MP4 and remux it only takes minutes
Or, better, something faster / more capable. Let me cite the pros / cons list from my review:
Pros
Accepts both M4V (MP4 / MOV) and MKV input, meaning you can quickly, say, downmix the AC3 track of an already-converted M4V file now that AC3 is no longer supported in the vast majority of players.
Very easy-to-setup for batch mode (to convert more than one video at a time) unlike MP4/MKVTools, where you do have to make some additional settings. Batch mode is particularly good compared to Subler, which has very weak batch support.
Cheap (compared to almost all the other remuxers; except for, of course, the free Subler).
Cons (in addition to the ones already explained)
Somewhat slow conversion, at least compared to the, in this regard, best tools (Subler, MP4Tools, AnyVideo Converter HD). It's still way faster than, say, iVI (Pro).
No support for video conversion for non-H.264 (for example, VC-1) input, unlike with MP4/MKVTools / iVI.
Uses at least twice the movie's filesize for temp files can be an issue when, to speed things up, you use a small(er) SSD to write the target movie file to
(No MTS support)
(More info:
https://forums.macrumors.com/threads/1504900/ )
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I'm also looking for mkv/720p/AC3/offline playback and according to the description it does that but would like to know if people have any experience with Cinexplayer?
Depends on your device. If it's an iPad 4, you won't have problems. If its something else (meaning far lower CPU performance), you'll encounter stuttering.
In the latter case, I recommend either remuxing with audio conversion (see my numerous tutorials on the matter) or using the just-returned AVPlayerHD, which has far better MKV playing performance.
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People say its crashing above 720p. No? Can it read your server like AirVideo?
No, it doesn't. It's "just" inefficient, compared to the best (e.g., AVPlayerHD) MKV players.
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New ac3 rules are very frustrating as all the players need to convert your files before they will play. I had avplayer but forgot to install it again after ios6 upgrade. Apple pulled it as you know.
Besides JBing what is the best solution?
Currently, AVPlayerHD.