I have Ubuntu 16.04 with all restricteds, addons, libs, etc installed and regionset China. I can play most DVDs from various sources and regions. But I cannot play any DVD that has been burned in China locally: copies of foreign dvds can play, but China specific cannot. The o/s will not even see a Chinese dvd in the drive, and gives error no disk found. Obviously, I need a codec or library or whatever. Has anyone had this problem and have you solved it? Please share your knowledge. Where can I find the codecs, apps, libs, etc ? Thanks.
I found the final solution by trial and error, after my laptop gave me clues (it has win7 and 15.10 loaded), and after weeks of frustrations without help. I loaded everything I could find for dvd: gxine; libxine-all; everything for ffmpeg; python3dvd; quicktime -lib and -util. I reinstalled the libdvd-read -css2 etc as a precaution. This enabled 16.04 to at least read the dvd and attempt to play it. VLC gave me an error reading about blocks, which is a cryptic way of stating the drive itself may be a problem. Seems my sata drive was too old and could not process the blocks. Bought a new drive and problem now solved. I hope my troubles and solution may benefit others. p.s. I think the quicktime is the main solution.