I have tried to upgrade from PlexMediaServer-0.9.14.6.1620-e0b7243-x86.spk to PlexMediaServer-1.5.7.4016-25d94bad9-x86.spk.
By giving you the filenames I hope it identifies the system which is a Synology Intel version.
I am transcode tv content which produces .ts files produced by DVBLink using a USB TV tuner adaptor on the Synology system.
WIth the 0.9.14.6... system it transcodes everything. Some of the programmes I transcode included tv programmes originally recorded in the noughtys (around 2006) but recently retransmitted as repeats, but were probably using old tv formats. These programmes transcode without error on version 0.9.14.6.....
When I upgrade to version 1.5.7... it will transcode recently made TV programmes but when I try to transcode these older programs, to sync with an iPad, I get a transcode error. They will however play correctly through a web interface on my Windows 10 pc.
Is there a resolution so I can upgrade to 1.5.7..., as I have had to reinstall the older version (0.9.14.6...), and transcode all programmes to sync to my iPad?