MPEG2 decoding

[PWR]

I have my DVD and Blu-ray collection ripped and stored as MKVs on a NAS, which I watch via a Dune Media Player on my TV. Many of the ripped DVD MKVs will also stream and play perfectly on my iPad Air using VLC, which is great because it means I don't have to transcode them. However, approximately half of the ex-DVD MKVs play back with severe pixelation on movement and are unwatchable. Static scenes are clean and un-pixelated.

This isn't a bit-rate issue because some of the unwatchable files have lower overall bit-rates than some of the files that play perfectly. Neither does it appear to be an MKV-related issue because the same problem has manifested itself on some VOB files streamed to VLC on iPad. The issue is that - curiously - some MPEG2 (ex-DVD) files play perfectly whereas some are unable to be decoded properly by VLC on iPad.

(Incidentally, the desktop version of VLC plays ALL my mkv files perfectly.)

Does anyone have any ideas what is causing this?

Thanks.

[PWR]

Any takers on this? Felix?

To put it more simply: some VOB files play perfectly while others decode very badly, with lots of pixelation. It looks like the frames are trying to reconstruct in the wrong sequence. I have tried re-multiplexing the mpeg2 data within other containers, removing audio and subtitle tracks - everything I can think of - but to no avail. Some mpeg2 (ex DVD) files just will not play properly on my iPad, although they play perfectly on a desktop (Mac) version of VLC.

I hope there is a fix for this because the last thing I want to do is transcode half my DVD rips to mp4. Why should some files play perfectly while others pixelate and pulse?

(I think this is the same issue described in this post: https://forum.videolan.org/viewtopic.ph ... 82#p395182)

Regards.