As far as we know, MP4, MKV are commonly supported formats for computer, Apple TV, iOS devices, Roku player, etc via streaming videos from NAS. And MPEG2 is a standard for lossy compression of video and audio, widely used for Video CDs which is now accepted by lots of media players, such as Windows Media Player and etc. Thus, what you need is a professional DVD ripping tool that supports converting DVD to these digital formats for NAS (Synology D212j) storing, streaming and playing with best quality.
Dimo Video Converter Ultimate for Mac is the recommended DVD to NAS converter for you. With this program, you can decrypt DVDs and lossless re-encode DVDs to MKV, MP4, MPEG-2 format and lossless backup DVD to mkv with keeping chapter markers for NAS (Synology D212j) on Mac (macos Sierra included).
Of course, this DVD ripper can help you convert commercial DVD movies to AVI, WMV, FLV, MOV, etc. and rip them for directly playback on Android, iOS, Windows based devices or VR headsets. Even AC3 5.1 audio can be preserved. Not only DVD, Blu-ray and SD/HD/4K video can be transcoded for NAS
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