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Apparent fix for some zero length recordings on 5D1

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bruce_s01

Joined: 08 Aug 2006
Posts: 544
Location: UK

Posted: Thu Sep 28, 2006 6:56 am Post subject: Apparent fix for some zero length recordings on 5D1

When carrying out simultaneous recordings using 2 Nova-T DVB cards, one of the recordings sometimes ended up zero length

From mythbackend.log

Code:

stream: start_time: 0.276 duration: 28320.966 bitrate=1093 kb/s
2006-09-27 02:00:01.151 AFD: Opened codec 0x86b9170, id(MPEG2VIDEO) type(Video)
2006-09-27 02:00:01.204 AFD: Opened codec 0x86bec90, id(MP2) type(Audio)
2006-09-27 02:00:03.057 TVRec(2): Changing from None to RecordingOnly
2006-09-27 02:00:03.093 DVB#1 Using DVB card 1, with frontend 'Conexant CX22702 DVB-T'.
2006-09-27 02:00:03.254 Started recording: Future Fighting Machines: channel 1567 on cardid 2, sourceid 1
2006-09-27 02:00:03.269 scheduler: Last message repeated 1 times: Finished recording: [adult swim]: channel 1601
2006-09-27 02:00:03.281 scheduler: Started recording: Future Fighting Machines: channel 1567 on cardid 2, sourceid 1
2006-09-27 02:00:04.147 DVB#1 DVB SI Table Parser Started
2006-09-27 02:00:04.284 Reschedule requested for id 0.
2006-09-27 02:00:04.592 DVBRec(1) Error: Failed to open DVB device
eno: Cannot allocate memory (12)
2006-09-27 02:00:04.761 Scheduled 88 items in 0.5 = 0.00 match + 0.48 place
2006-09-27 02:00:04.771 scheduler: Scheduled items: Scheduled 88 items in 0.5 = 0.00 match + 0.48 place
2006-09-27 02:00:11.834 DVB#1 ERROR - Failed to set demux buffer size (pid 18)
(12) Cannot allocate memory
[mpeg2video @ 0xb70b2620]ac-tex damaged at 27 18
[mpeg2video @ 0xb70b2620]Warning MVs not available

{snippage}

2006-09-27 02:25:00.860 TVRec(2): Changing from RecordingOnly to None
2006-09-27 02:25:01.393 Finished recording Future Fighting Machines: channel 1567
2006-09-27 02:25:01.394 Reschedule requested for id 0.
2006-09-27 02:25:01.398 scheduler: Finished recording: Future Fighting Machines: channel 1567
2006-09-27 02:25:01.860 Finished recording Future Fighting Machines: channel 1567
2006-09-27 02:25:01.934 Scheduled 86 items in 0.5 = 0.01 match + 0.53 place
2006-09-27 02:25:01.944 scheduler: Last message repeated 1 times: Finished recording: Future Fighting Machines: channel 1567
2006-09-27 02:25:01.935 Preview Error: Previewer file '/myth/tv/1567_20060927020000.mpg' is not valid.
[mpeg2video @ 0xb6fff620]ac-tex damaged at 9 3
[mpeg2video @ 0xb6fff620]Warning MVs not available

So looking at dmesg:

Code:

allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.
allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.
allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.
allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.
allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.
allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.
allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.

So searching for vmalloc, I found out that default setting for a normal kernel is 128m, so I added vmalloc=256m (my machine has 1GB of memory) to the append line in etc/lilo.conf and running lilo -v to update the boot files.
I then rebooted and then commenced to schedule several simultaneous recordings to test it. The recordings were OK and the memory allocation error lines no longer appear.

Hope this helps someone.
Regards
Bruce S.
_________________
Updated 2010/06/26: Athlon64 3700+ Asus A8N4-SLI Deluxe
1Gb PC 3200, 200Gb+250Gb SATA HDD,
DVD-RW LG , Gigabyte GV-NX66128DP
Hauppauage Nova-T 500 + Hauppauge Nova-(D)T 500,+ Nova HD S2 LinHes R6 RC2

tjc

Joined: 25 Mar 2004
Posts: 9117
Location: Arlington, MA

Posted: Thu Sep 28, 2006 6:31 pm Post subject:

Nice catch!

cecil
Site Admin

Joined: 19 Sep 2003
Posts: 2643
Location: Fontana, Ca

Posted: Mon Oct 02, 2006 7:49 pm Post subject:

Nice indeed!

seano

Joined: 25 Nov 2005
Posts: 73

Posted: Wed Jan 03, 2007 8:00 pm Post subject: Re: Apparent fix for some zero length recordings on 5D1

bruce_s01 wrote:

Hope this helps someone.

Helped me!
Thanks Bruce_s01!

Only difference was:

Code:

kernel: allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.

Appeared in messages and kern.log (not in dmesg)

Thanks again!

-Seano

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