Hello,
i'm currently facing off against a strange problem happening using the latest DVBLink Server + TVSource + TVAdvisor for Synology 415Play (some 6.0.0 build) and HD recordings. I'm using a DVBSky 960 CI as a tuner and so far it works well. I never tested it on another system so I can't say if the device itself is the problem, but since SD recordings work well... anyway, here's what's happening.
Well, kind of easy, as soon as I start HD recordings I encounter discontinuities, no matter if I visit the monitoring page or not. But if I visit the monitoring page, I can see them, they happen unforeseen and the encounter rate differs from recording to recording, but always multiple at once, starting at 4 at the same time, up to 31, totally random, as far as I can say. Sometimes there is just one moment where those discontinuities occur, sometimes they occur 5 or 6 times in one recording, but I never got one HD recording without any discontinuity at all. I can also say that SD recordings work without any problem at all, they run smoothly and do not have any errors or disconts at all. I'm checking the recordings afterwards using TSDoctor, which is also partly able to repair those failure, even if losing frames of course.
Anyway, I checked out a lot. I thought it might be the usb speed and switched the device from the USB 3.0 hub it was connected to into the 415Play itself - nothing changed. I tried plugging it into the USB 2.0 port of the 415Play and also into the 3.0 port - also, no difference. I checked the CPU state while recording and tried checking it while the disconts occurred - nothing strange here (always around 10% CPU usage). I thought it might be the HDD write speed which lacks the relevant transfer speed but honestly, I'm using a 4-drive RAID 5 with 4 8 TB Seagate drives with around 5400 rpm, it can't happen that those drives don't make the 15-20 MBit/sec write speed, at least I didn't do anything else on the device, so this shouldn't be the case, or do you think that this should be the problem? Anyway, even if the HDD should lack speed, the RAM should cache the data until writing is possible again, shouldn't it? That led me in testing recording with the Synology feature HDD write cache enabled and disabled - both didn't help (I at this moment disable write cache since this seems to have problems with RAID 5, or at least my seagate drives).
I also unplugged the power cord of the 960 CI, waited a bit and plugged it in again to make sure it isn't a problem with the 960 CI itself, no luck for me. I'm not sure if HD recordings ever worked for my system constellation. I have this 960 CI for half a year now and I use it quite often, but more or less only for SD recordings, that's why I encountered this problem just now and not lots earlier.
Well, now's the point I hit a brick wall and don't know where to turn next. That's bad since I planned to equip my 960 CI with a HD+ card to even watch private HD programs in the next week, but if I can't record them properly this seems a bit unnecessary to me...
Just to add, I don't know if the streaming works, since I don't Live TV very often (my server's main purpose is to record stuff while i'm not at home or don't have time).
Anyway, to show you what I mean I started a recording spontaneously at 5:40 PM today and attached you the log file, so you can guess whats happening. Any hints what I can try to make this work? Thanks.
Best Regards.
Timtam