[mythtv-users] MythTV IPTV gets blank recordings randomly

[kariya]

Hello,

I use IPTV and it works fine intermittently.
LiveTV succeeds 10% and scheduled recordings 80%,
but randomly and often I get blank recordings(0-byte length).
Does anyone have any idea about this problem?
I thank you for any help.

I use 
	MythTV trunk [26538] backend on Ubuntu 10.04
		Linux g5 2.6.32-24-server #39-Ubuntu SMP Wed Jul 28 06:21:40 UTC 2010 x86_64 GNU/Linux 
	and frontend on Intel MacMini.
In addition, I use mhddfs and virtualbox for slave backends.
The machine(linux box) spec:
	CPU AMD Phenom II X4 955
	RAM 6GB
	
The backend log is as follows:
(Lines starting with '*' is output of my channel change script.)

2010-10-04 23:29:31.582 TVRec(7): Changing from None to WatchingLiveTV
2010-10-04 23:29:31.594 TVRec(7): HW Tuner: 7->7
2010-10-04 23:29:31.610 LoadFromScheduler(): Error, called from backend.
2010-10-04 23:29:31.646 Launching: /usr/local/bin/pt2.sh 42
2010-10-04 23:29:31.647 PID 1396: launched
2010-10-04 23:29:31.706 Finished recording 23: channel 3042
2010-10-04 23:29:31.796 LoadFromScheduler(): Error, called from backend.
2010-10-04 23:29:31.809 recording already exists...
2010-10-04 23:29:31.831 Finished recording 23: channel 3042
*using B25...
*using device: /dev/pt1video2
*pid = 19930
2010-10-04 23:29:33.218 PID 1396: exited: status=0, result=0
*C/N = 33.206299dB
*Recording...
2010-10-04 23:29:35.346 MainServer::ANN Playback
2010-10-04 23:29:35.348 adding: imac as a client (events: 0)
2010-10-04 23:29:35.353 MainServer::HandleAnnounce FileTransfer
2010-10-04 23:29:35.354 adding: imac as a remote file transfer
2010-10-04 23:29:37.387 RingBuf(/data/mythtv/3042_20101004232932.mpg) Error: OpenFile(): File too small (0B).
2010-10-04 23:29:37.437 RingBuf(/data/mythtv/3042_20101004232932.mpg) Error: Seek(0, SEEK_SET) Failed
eno: Bad file descriptor (9)
2010-10-04 23:29:37.453 RingBuf(/data/mythtv/3042_20101004232932.mpg) Error: Seek(0, SEEK_SET) Failed
eno: Bad file descriptor (9)
2010-10-04 23:29:37.466 RingBuf(/data/mythtv/3042_20101004232932.mpg) Error: Seek(0, SEEK_SET) Failed
eno: Bad file descriptor (9)
2010-10-04 23:29:37.485 RingBuf(/data/mythtv/3042_20101004232932.mpg) Error: Seek(0, SEEK_SET) Failed
eno: Bad file descriptor (9)
2010-10-04 23:29:37.499 RingBuf(/data/mythtv/3042_20101004232932.mpg) Error: Seek(0, SEEK_SET) Failed
eno: Bad file descriptor (9)
2010-10-04 23:29:37.512 RingBuf(/data/mythtv/3042_20101004232932.mpg) Error: Seek(0, SEEK_SET) Failed
eno: Bad file descriptor (9)
2010-10-04 23:29:38.643 TVRec(7): Changing from WatchingLiveTV to None
2010-10-04 23:29:38.783 Finished recording 23: channel 3042
2010-10-04 23:29:38.855 MainServer::ANN Playback
2010-10-04 23:29:38.859 adding: imac as a client (events: 0)
2010-10-04 23:29:38.918 TVRec(7): Changing from None to WatchingLiveTV
2010-10-04 23:29:38.934 TVRec(7): HW Tuner: 7->7
2010-10-04 23:29:38.951 LoadFromScheduler(): Error, called from backend.
2010-10-04 23:29:39.025 Launching: /usr/local/bin/pt2.sh 42
2010-10-04 23:29:39.028 PID 1435: launched
2010-10-04 23:29:39.098 Finished recording 23: channel 3042
2010-10-04 23:29:39.172 LoadFromScheduler(): Error, called from backend.
2010-10-04 23:29:39.476 PID 1435: exited: status=0, result=0
2010-10-04 23:29:39.729 Finished recording 23: channel 3042
2010-10-04 23:29:39.781 TVRec(7): Changing from WatchingLiveTV to None
*using B25...
*using device: /dev/pt1video2
*pid = 20098
2010-10-04 23:29:40.400 Finished recording 23: channel 3042
*C/N = 33.689003dB
*Recording...