[mythtv] Still problems with the dbox2 code

[Steven]

Chemical 801 schreef:

>Hi all,
>
>I've spent quite a bit of time trying to debug a problem I've been
>having playing back dbox2 recordings, and I'm now pretty confident
>that the problem lies in the code that records the TS stream from the
>Dbox. This problem is still present on SVN version 7931.
>
>The problem may be the same as ticket #659. I'm wondering if this
>ticket has been closed prematurely. This is a quick run-down of the
>problem I'm seeing.
>
>Mythbackend records the stream from the dbox, but when mythfrontend
>tries to play it back, the screen goes black. I occasionally hear some
>blips of audio, and on a long recording, I occasionally see some
>fragments of video. I've pasted the debug output from mythfrontend at
>the bottom of this message.
>
>Anyone interested can download the first few seconds of a recording here:
>http://s55.yousendit.com/d.aspx?id=12A1ZYM4FQXI23POEY3OLSJILO
>
>The above file was captured by mythbackend-svn-7931. I've simply
>truncated it to keep the download small.
>
>MPlayer plays this file flawlessly. I suspect that whatever is wrong
>in the first few frames of the stream Mplayer manages to compensate,
>whereas mythfrontend can't.
>
>I have also managed to repair the file by running it through either
>Project-X and dvb-replex. I've performed TS->TS "conversions"
>independently with both tools, and mythfrontend will happily play the
>resulting files.
>
>I have used a variety of Linux distros during testing, including FC4,
>Gentoo and Ubuntu. I have used two different dboxes, one is a Sagem,
>and the other Nokia. I have used several different Sportster images
>and on one occasion I also tried Yadi. The results are always the
>same.
>
>I'd love to be able to debug this problem myself, but I just don't
>have the coding experience or knowledge of Mpeg2 TS to do so. I am
>however very willing to test any proposed solutions, and provide
>further feedback.
>
>Cheers,
>jmce
>
>Debug output from mythfrontend during playback:
>
>2005-11-19 14:45:09.400 Using protocol version 22
>2005-11-19 14:45:10.643 New DB connection, total: 2
>2005-11-19 14:45:10.687 TV: Attempting to change from None to
>WatchingPreRecorded
>2005-11-19 14:45:12.794 AFD: Opened codec 0xb35bd80, id(MP3) type(Audio)
>2005-11-19 14:45:12.794 AFD: Opened codec 0xb35c150, id(DVB_SUBTITLE)
>type(Subtitle)
>2005-11-19 14:45:12.816 AFD: Opened codec 0xb35c690, id(MPEG2VIDEO) type(Video)
>2005-11-19 14:45:12.816 AFD: Opened codec 0xb36c6f0, id(MP3) type(Audio)
>2005-11-19 14:45:12.816 AFD: Opened codec 0xb36c9e0, id(DVB_SUBTITLE)
>type(Subtitle)
>2005-11-19 14:45:12.818 AFD: Opened codec 0xb36cce0, id(MPEG2VIDEO) type(Video)
>2005-11-19 14:45:12.836 AFD: Opened codec 0xb36cfe0, id(MPEG2VIDEO) type(Video)
>2005-11-19 14:45:12.836 AFD: Opened codec 0xb36d3b0, id(MP3) type(Audio)
>2005-11-19 14:45:12.836 AFD: Opened codec 0xb36d940, id(DVB_SUBTITLE)
>type(Subtitle)
>2005-11-19 14:45:12.837 AFD: Opened codec 0xb36dc40, id(MP3) type(Audio)
>2005-11-19 14:45:12.838 AFD: Opened codec 0xb36df40, id(MPEG2VIDEO) type(Video)
>2005-11-19 14:45:12.838 AFD: Opened codec 0xb36e480, id(DVB_SUBTITLE)
>type(Subtitle)
>
>(repeats ....)
>
Hi,

I can tell you that Levent (the original author of the dbox stuff) is 
working on an update that will use a different streaming protocol 
(udrec, and thus using udp instead of tcp).
This might improve things.

Steven