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

Sat Jan 5 23:30:44 UTC 2013

2013/1/6 Andréas Kühne <andreas at kuhne.se>:
> 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
>>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> mythtv-users mailing list
>>>>> mythtv-users at mythtv.org
>>>>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> mythtv-users mailing list
>>>> mythtv-users at mythtv.org
>>>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>>>>
>>>
>>>
>>>
>>> --
>>> vänliga hälsningar,
>>>
>>> Andréas
>>>
>>> Upplandsgatan 93 . 113 44 . Stockholm
>>> Mobil 076 543 8825
>>> andreas at kuhne.se
>>>
>>> _______________________________________________
>>> mythtv-users mailing list
>>> mythtv-users at mythtv.org
>>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>>>
>>
>>
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>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>>
>
>
>
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>

Hello, I have same problem with buffers. I have this message on the
mythfrontend log:

Jan  6 00:19:58 telemedia  mythfrontend[3192]: E CoreContext
audio/audiooutputalsa.cpp:242 (IncPreallocBufferSize) ALSA: Try to
manually increase audio buffer with: echo 128 | sudo tee
/proc/asound/card1/pcm7p/sub0/prealloc

I add to mythtv user on sudoers file:

mythuser ALL=(ALL) NOPASSWD:/usr/bin/tee /proc/asound/card1/pcm7p/sub0/prealloc

The problem is that when I execute the command there is no change on
the prealloc file:

$ cat /proc/asound/card1/pcm7p/sub0/prealloc
64
$ echo 128 | sudo tee /proc/asound/card1/pcm7p/sub0/prealloc
128
$ cat /proc/asound/card1/pcm7p/sub0/prealloc
64

I try with this, but nothing:

# echo 128 > /proc/asound/card1/pcm7p/sub0/prealloc

Do this command really change the prealloc file?

Thanks and best regards.

--
Josu Lazkano