Problems changing channels in live tv

[sugatam]

I recently set up gbpcr with comcast, using a dvico qam card on the pc, schedules direct for epg, and mvpmcx2 on a A110 via network browse. Works great for the most part, except I have this recurring problem. When witching channels on live tv via the arrow keys, I get a second or two of the new channel, then the screen goes black, and after several seconds I get thrown back to the tv guide. Live tv works great if I don't try to switch channels.

Any idea what's wrong?

[mvallevand]

If you compressed and upload your log files, I will have a look. I'm not optimistic, for now I think this is something that sub probably has to deal with, but since he already has improved digital stream capture significantly over the last year. I think it is just a matter of time.

Martin

[sugatam]

Here are the logs. A couple of channel switches were actually successful, and I got the black screen and thrown back to the guide on the third change

[mvallevand]

Yes this is one of the problem scenarios that I suspect is a problem. If you noticed the last log sequence, the file stops growing{

Code:

2009-07-23 08:58:53.656    VERBOSE    [7]    Request 200000 bytes (file size:1373904   file location: 38)
2009-07-23 08:58:53.718    VERBOSE    [7]    Request 200000 bytes (file size:1504752   file location: 200038)
2009-07-23 08:58:53.812    VERBOSE    [7]    Request 200000 bytes (file size:1701024   file location: 400038)
2009-07-23 08:58:53.875    VERBOSE    [7]    Request 200000 bytes (file size:1831872   file location: 600038)
2009-07-23 08:58:53.906    VERBOSE    [7]    Request 200000 bytes (file size:1897296   file location: 800038)

2009-07-23 08:59:32.937    VERBOSE    [7]    Request 200000 bytes (file size:1373904   file location: 38)
2009-07-23 08:59:33.031    VERBOSE    [7]    Request 200000 bytes (file size:1504752   file location: 200038)
2009-07-23 08:59:33.062    VERBOSE    [7]    Request 200000 bytes (file size:1504752   file location: 400038)
2009-07-23 08:59:33.093    VERBOSE    [7]    Request 200000 bytes (file size:1570176   file location: 600038)
2009-07-23 08:59:33.125    VERBOSE    [7]    Request 200000 bytes (file size:1635600   file location: 800038)

2009-07-23 08:59:45.781    VERBOSE    [7]    Request 200000 bytes (file size:1962720   file location: 38)
2009-07-23 08:59:45.812    VERBOSE    [7]    Request 200000 bytes (file size:2028144   file location: 200038)
2009-07-23 08:59:45.875    VERBOSE    [7]    Request 200000 bytes (file size:2224416   file location: 400038)
2009-07-23 08:59:45.906    VERBOSE    [7]    Request 200000 bytes (file size:2289840   file location: 600038)
2009-07-23 08:59:45.937    VERBOSE    [7]    Request 200000 bytes (file size:2355264   file location: 800038)

2009-07-23 09:00:02.421    VERBOSE    [7]    Request 200000 bytes (file size:4252560   file location: 38)
2009-07-23 09:00:02.453    VERBOSE    [7]    Request 200000 bytes (file size:4252560   file location: 200038)
2009-07-23 09:00:02.484    VERBOSE    [7]    Request 200000 bytes (file size:4252560   file location: 400038)
2009-07-23 09:00:02.515    VERBOSE    [7]    Request 200000 bytes (file size:4252560   file location: 600038)
2009-07-23 09:00:02.546    VERBOSE    [7]    Request 200000 bytes (file size:4252560   file location: 800038)

Martin

[sugatam]

So does that mean gbpvr stops appending the data stream to the file?

[mvallevand]

Once the NMT starts streaming it is important that GBPVR continuously provide data otherwise it thinks it reaches an end of file. I don't know what this log means but is one of the things I note when livetv stops on a channel change.

Martin

[sugatam]

Thanks for your patience with my questions. If this is a known problem with gbpvr and digital sources, do you have any idea when a fix will be available?

On an unrelated note, I'm curious how you have written the nmt "mono" replacement. I thought the sigma libraries that interface with the actual video chip are not freely available?

[mvallevand]

My suggestion is to try in the next version when it comes out and bump sub if it still a problem.

As for the libraries, the sigma libraries like mono are closed source. I donated my time to Syabas to create a closed source library that I call instead of mono.

Martin

[sugatam]

Thanks for the explanation. Is this Syabas library you created available for download somewhere (I mean the .a binary and the header files)?

[mvallevand]

Hopefully a .so will be available this fall but I'm waiting to see what Syabas does with the firmware after the C-200 comes out.

Note that the library is not a player, it will need a UI and a control module to make it do anything. This is a a lot of work too and since it can only do mpeg files it probably isn't going to attract a lot of developers.

Martin