(Very) slow channel change

[sdf]

To help us determine if it's a capture or playback issue, when you're getting these 20-25 second channel changes, when do you see a live tv buffer file created in buffer directory? ie, is it fairly immediately, or is it after 20-25 seconds. If it's created immediately, after a few seconds, if you look at the file properties, does it have data in it (ie a non-zero file size)? If you copy one of those files after say 10 seconds, can you play that file and see video?

Thank you sub for your interest.
The buffer file is always created immediately. When channel change stalls (not always but often), i have two ts files: the old channel and the new channel. Obviously the new ts file is 0 length, and nextpvr (client) has a blank screen. The old file is playable. Seems like a client, not a server problem.
I've made some testing with kodi, and channel change is 2-3 secs, also on an android smartphone (via wifi).
Maybe it depends on the decoder?
Tell me if you need further logs.
Thank you,
sdf

[johnsonx42]

Thank you sub for your interest.
The buffer file is always created immediately. When channel change stalls (not always but often), i have two ts files: the old channel and the new channel. Obviously the new ts file is 0 length, and nextpvr (client) has a blank screen. The old file is playable. Seems like a client, not a server problem.
I've made some testing with kodi, and channel change is 2-3 secs, also on an android smartphone (via wifi).
Maybe it depends on the decoder?
Tell me if you need further logs.
Thank you,
sdf

sorry sdf, cpyne hijacked your thread with a completely unrelated problem (he didn't know it was unrelated when he posted, but that's still why everyone really should post their own thread). yours is almost surely just a decoder issue. the only MPEG-2 decoder I know that plays well with channel changes is the Microsoft DTV-DVD decoder (which is unusable after Windows 7). I think the Hauppauge/main concept decoder also works well, and the cyberlink. ffdshow is hit-and-miss, the LAV decoder definitely no good, ATI MPEG-2 decoder is also unreliable (tends to freeze up after skipping, also after channel changes).

(oh, sorry, just realized you're in Italy, which made me want to try to dust off the little italian I know only to realize I can't put two words together anymore... and also maybe that means you're using h.264 instead of MPEG2? in that case the Microsoft decoder should be available)

[sub]

Thank you sub for your interest.
The buffer file is always created immediately. When channel change stalls (not always but often), i have two ts files: the old channel and the new channel. Obviously the new ts file is 0 length, and nextpvr (client) has a blank screen. The old file is playable. Seems like a client, not a server problem.
I've made some testing with kodi, and channel change is 2-3 secs, also on an android smartphone (via wifi).
Maybe it depends on the decoder?
Tell me if you need further logs.
Thank you,
sdf

Given kodi is changing channels in the normal time, it sounds like the capture side is working, so yes it will be decoder/renderers.

[sdf]

sorry sdf, cpyne hijacked your thread with a completely unrelated problem (he didn't know it was unrelated when he posted, but that's still why everyone really should post their own thread). yours is almost surely just a decoder issue. the only MPEG-2 decoder I know that plays well with channel changes is the Microsoft DTV-DVD decoder (which is unusable after Windows 7). I think the Hauppauge/main concept decoder also works well, and the cyberlink. ffdshow is hit-and-miss, the LAV decoder definitely no good, ATI MPEG-2 decoder is also unreliable (tends to freeze up after skipping, also after channel changes).

Thank you, johnsonx42 for your interest.
Yes, it is definitely a decoder issue, but must be solved programmatically. I've tried every mpeg 2 decoder in the world (almost), and if you are not on windows 7 and can't use microsoft DTV-DVD decoder nextpvr (client) is almost unusuable.
It seems to me that the server part (once configured firewall and windows defender) works perfectly.
From what I've seen in my configuration, ffdshow is the best decoder, but somestimes stalls (6,10 and also 20-25 secs). Also cyberlink is slow. Every codec has troubles.
What I can't understand is why kodi is so speedy, don't know if it depends on the splitter.

(oh, sorry, just realized you're in Italy, which made me want to try to dust off the little italian I know only to realize I can't put two words together anymore... and also maybe that means you're using h.264 instead of MPEG2? in that case the Microsoft decoder should be available)

You speak italian? Very good!! Here in italy only 4 stations (Dvb-t) are in H264; the rest is mpeg2. So the problem is related to most stations.
Thank you,
sdf

[cpyne]

Yep, sorry for the hijack. I did finally get to the ceton logs by using a different browser than Edge, but nothing obvious was there. (IE works fine). Rather than mess with the Ceton further, I decided to order a HD HomeRun Prime off Amazon. No guarantee this will fix it, but I figured it was time to upgrade anyway

[sub]

sdf, if you set all the audio decoders to disabled, does it make any difference on your channel change time?

[sdf]

Thank you, sub
No, the behaviour is the same.
Speed is fluctuating, don't know why.
While the .ts file is created alwayas after exactly the same amount of time (0,5-1 sec), video on the screen (and the deletion of the .ts related to the channel previously selected) sometimes appears very quickly (1-2 secs), but sometimes it takes very long.
Bye,
sdf

[sub]

Yeah, that is definitely not normal. There has got be something specific about your configuration that is causing this. If you're up for it, I'm happy to remotely connect using Teamviewer and take a look for you.

[sdf]

Thank you very much, sub.
In the meantime, found an old laptop with windows 7, and installed nextpvr client with microsoft decoders, but the situation doesn't change.
Don't know how to do with teamviewer; now here in Italy is 9,45 am. Will install it and wait for your instructions.
Thank you,
sdf

[sub]

Thank you very much, sub.
In the meantime, found an old laptop with windows 7, and installed nextpvr client with microsoft decoders, but the situation doesn't change.
Don't know how to do with teamviewer; now here in Italy is 9,45 am. Will install it and wait for your instructions.
Thank you,
sdf

If you install teamviewer and PM me the connection details, I'll connect and check a few things.