[mythtv-users] Video frame buffering failed too many times [0.26-fixes]

Sat Jan 5 23:12:00 UTC 2013

Thanks Igor,

I move the setting to /etc/rc.local (which is always run after startup) and
now it is set to the max value, just as yours is.

// Andréas

2013/1/5 Igor Cicimov <icicimov at gmail.com>

>
> On Sun, Jan 6, 2013 at 9:44 AM, Andréas Kühne <andreas at kuhne.se> wrote:
>
>> I checked now again.
>>
>> I tried to set the max value (as you indicated below), but after setting
>> the value and then trying to read the value again, it doesn't work. The
>> default value is reset.
>>
>> I am also using Mythbuntu (version 12.04, myth 0.26)
>>
>> // Andréas
>>
>>
> This is what mine is set to atm:
>
> **igorc at mythtv:~$ cat /proc/asound/card1/pcm3p/sub0/prealloc
> 32768
>
> This is mine startup script, sorry I was wrong it is not set in the user
> login but as system init script:
>
> igorc at mythtv:~$ cat /etc/init.d/sound_card_buffer_prealloc
> #!/bin/bash
>
> [ -f /proc/asound/card1/pcm3p/sub0/prealloc ] && echo 32768 >
> /proc/asound/card1/pcm3p/sub0/prealloc
> [ -f /proc/asound/card0/pcm3p/sub0/prealloc ] && echo 32768 >
> /proc/asound/card0/pcm3p/sub0/prealloc
> [ -f /proc/asound/card2/pcm3p/sub0/prealloc ] && echo 32768 >
> /proc/asound/card2/pcm3p/sub0/prealloc
>
> I have to check for 3 devices since ALSA constantly changes my device
> order (still no idea why).
>
> This is the structure and permissions on my sound directory:
>
> igorc at mythtv:~$ ls -l /proc/asound/
> total 0
> dr-xr-xr-x 7 root root 0 Jan  6 09:51 card0
> dr-xr-xr-x 3 root root 0 Jan  6 09:51 card1
> dr-xr-xr-x 3 root root 0 Jan  6 09:51 card2
> -r--r--r-- 1 root root 0 Jan  6 09:51 cards
> lrwxrwxrwx 1 root root 5 Jan  6 09:51 CX8811 -> card2
> -r--r--r-- 1 root root 0 Jan  6 09:51 devices
> lrwxrwxrwx 1 root root 5 Jan  6 09:51 Generic -> card1
> -r--r--r-- 1 root root 0 Jan  6 09:51 hwdep
> -r--r--r-- 1 root root 0 Jan  6 09:51 modules
> dr-xr-xr-x 2 root root 0 Jan  6 09:51 oss
> -r--r--r-- 1 root root 0 Jan  6 09:51 pcm
> lrwxrwxrwx 1 root root 5 Jan  6 09:51 SB -> card0
> dr-xr-xr-x 2 root root 0 Jan  6 09:51 seq
> -r--r--r-- 1 root root 0 Jan  6 09:51 timers
> -r--r--r-- 1 root root 0 Jan  6 09:51 version
> igorc at mythtv:~$ ls -l /proc/asound/card1
> total 0
> -r--r--r-- 1 root root 0 Jan  6 09:51 codec#0
> -rw-r--r-- 1 root root 0 Jan  6 09:51 eld#0.0
> -r--r--r-- 1 root root 0 Jan  6 09:51 id
> dr-xr-xr-x 3 root root 0 Jan  6 09:51 pcm3p
> igorc at mythtv:~$ ls -l /proc/asound/card1/pcm3p/
> total 0
> -r--r--r-- 1 root root 0 Jan  6 09:52 info
> dr-xr-xr-x 2 root root 0 Jan  6 09:52 sub0
> igorc at mythtv:~$ ls -l /proc/asound/card1/pcm3p/sub0/
> total 0
> -r--r--r-- 1 root root 0 Jan  6 09:52 hw_params
> -r--r--r-- 1 root root 0 Jan  6 09:52 info
> -rw-r--r-- 1 root root 0 Jan  6 09:52 prealloc
> -r--r--r-- 1 root root 0 Jan  6 09:52 prealloc_max
> -r--r--r-- 1 root root 0 Jan  6 09:52 status
> -r--r--r-- 1 root root 0 Jan  6 09:52 sw_params
>
>  I'm using the HDMI output to Sony 32" HD TV, card1 device3.
>
>
>
>> 2013/1/5 Igor Cicimov <icicimov at gmail.com>
>>
>>> On Sun, Jan 6, 2013 at 9:20 AM, Andréas Kühne <andreas at kuhne.se> wrote:
>>>
>>>> I have tried setting the following as well, however the setting never
>>>> changes. Also, how would I set it so that the change is permanent after
>>>> each restart?
>>>>
>>>> Regards,
>>>>
>>>> Andréas
>>>>
>>>>
>>> Hmmm works for me in Mythbuntu. I have it in startup script after ALSA
>>> gets initiated and the mythtv user gets auto logged in. I set it to 32768
>>> though which is the max value for my device (found in
>>> /proc/asound/card0/pcm0p/sub0/max_prealloc file)
>>>
>>>
>>>> 2013/1/5 Igor Cicimov <icicimov at gmail.com>
>>>>
>>>>> On Sun, Jan 6, 2013 at 8:47 AM, Igor Cicimov <icicimov at gmail.com>wrote:
>>>>>
>>>>>>
>>>>>> On 06/01/2013 7:51 AM, "Stephen Robertson" <
>>>>>> stephengrobertson at gmail.com> wrote:
>>>>>> >
>>>>>> > Hi all,
>>>>>> >
>>>>>> > I'm getting this error when watching live TV.  I don't think I ever
>>>>>> > see this watching recorded or in progress recordings.
>>>>>> >
>>>>>> > I've searched the archives and found references to this but they
>>>>>> seem
>>>>>> > to be from some time ago so I'm not sure whether this is a known
>>>>>> > problem or whether it was thought to be fixed.
>>>>>> >
>>>>>> > As far as I can tell it seems to happen a few minutes after the
>>>>>> > program has changed (Not the channel, this happens with no user
>>>>>> > action).
>>>>>> >
>>>>>> > This is on a standalone FE connected via gigabit ethernet
>>>>>> >
>>>>>> > Any thoughts/suggestions welcome.
>>>>>> >
>>>>>> > Stephen
>>>>>> >
>>>>>>
>>>>>> Is the problem showing on all channels or only SD or only HD? All
>>>>>> stations or one specific? Looks like sound decoding error causing the video
>>>>>> playback to back off waiting for the sound.
>>>>>>
>>>>>> > Logs at:
>>>>>> > http://pastebin.com/nCzZAdcy
>>>>>> > http://pastebin.com/0WbCRLBi
>>>>>> >
>>>>>> > MythTV Version : v0.26.0-55-g09ac5b2
>>>>>> > MythTV Branch : fixes/0.26
>>>>>> > Network Protocol : 75
>>>>>> > Library API : 0.26.20120822-1
>>>>>> > QT Version : 4.8.1
>>>>>> > Options compiled in:
>>>>>> >  linux profile use_hidesyms using_alsa using_oss using_pulse
>>>>>> > using_pulseoutput using_backend using_bindings_perl
>>>>>> > using_bindings_python using_bindings_php using_crystalhd using_dvb
>>>>>> > using_firewire using_frontend using_hdhomerun using_ceton
>>>>>> using_hdpvr
>>>>>> > using_iptv using_ivtv using_joystick_menu using_libcec
>>>>>> using_libcrypto
>>>>>> > using_libdns_sd using_libxml2 using_lirc using_mheg
>>>>>> using_opengl_video
>>>>>> > using_qtwebkit using_qtscript using_qtdbus using_v4l2 using_x11
>>>>>> > using_xrandr using_xv using_bindings_perl using_bindings_python
>>>>>> > using_bindings_php using_mythtranscode using_opengl using_vaapi
>>>>>> > using_vdpau using_ffmpeg_threads using_live using_mheg using_libass
>>>>>> > using_libxml2
>>>>>> > _______________________________________________
>>>>>> > mythtv-users mailing list
>>>>>> > mythtv-users at mythtv.org
>>>>>> > http://www.mythtv.org/mailman/listinfo/mythtv-users
>>>>>>
>>>>> CoreContext audio/audiooutputalsa.cpp:242 (IncPreallocBufferSize)
>>>>> ALSA: Try to manually increase audio buffer with: echo 128 | sudo tee
>>>>> /proc/asound/card0/pcm0p/sub0/prealloc
>>>>> Jan  5 10:38:58 revo01 mythlogserver: mythfrontend[1714]: I
>>>>> CoreContext mythpainter_ogl.cpp:62 (ClearCache) Clearing OpenGL painter
>>>>> cache.
>>>>>
>>>>> Yeah have seen this before the sound buffer is set too low. Do as the
>>>>> error message say:
>>>>>
>>>>> $ echo 4096 | sudo tee /proc/asound/card0/pcm0p/sub0/prealloc
>>>>>
>>>>> with 4096 instead 128 to be on the safe side and see if the error goes
>>>>> away.
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> mythtv-users mailing list
>>>>> mythtv-users at mythtv.org
>>>>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>>>>>
>>>>>
>>>>
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>>>>
>>>>
>>>
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>>>
>>>
>>
>>
>> --
>> vänliga hälsningar,
>>
>> Andréas
>>
>> Upplandsgatan 93 . 113 44 . Stockholm
>> Mobil 076 543 8825
>> andreas at kuhne.se
>>
>> _______________________________________________
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>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>>
>>
>
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