[mythtv-users] Playback stops, returns to guide [Ringbuf Error: I/O problem in safe_read]

Fri Apr 24 21:48:48 UTC 2009

>> I have been having an issue where playback of recorded shows will  
>> stop, usually right around the title sequence, and will return me  
>> to the "Recorded Programs" list. I tried looking through the lists  
>> to see if this problem has been found and fixed, and was not able  
>> to find a solution. I did find two other posts (from 2004) but  
>> neither seemed to have any replies:
>> 1) http://www.gossamer-threads.com/lists/mythtv/users/61928?search_string=playback;#61928
>> 2) http://www.gossamer-threads.com/lists/mythtv/users/71233?nohighlight=1#71233
>>
>>
>> From searching through the googles, I found mentions of running m/ 
>> ythcommflag --rebuild -f <filename> /to rectify a bad seektable and  
>> this is what was returned:
>>
>> mythcommflag --rebuild -f 1006_20090423203000.mpg
>> 2009-04-24 09:32:53.313 Using runtime prefix = /usr
>> 2009-04-24 09:32:53.354 DBHostName is not set in mysql.txt
>> 2009-04-24 09:32:53.354 Assuming localhost
>> 2009-04-24 09:32:53.354 Empty LocalHostName.
>> 2009-04-24 09:32:53.468 New DB connection, total: 1
>> 2009-04-24 09:32:53.490 Closing DB connection named 'DBManager0'
>> 2009-04-24 09:32:53.493 mythcommflag version: 0.21.20080304-1 www.mythtv.org 
>>  <http://www.mythtv.org/>
>> 2009-04-24 09:32:53.493 Enabled verbose msgs: important
>>
>> MythTV Commercial Flagger, started at Fri Apr 24 09:32:53 2009
>> Rebuilding SeekTable(s) for:
>> ChanID  Start Time      Title                                       
>> Status
>> ------  --------------  -----------------------------------------   
>> ------
>> 2009-04-24 09:32:53.504 New DB connection, total: 2
>> 1006    20090423203000  Parks and Recreation                        
>> 2009-04-24 09:32:53.578 Using protocol version 40
>> 2009-04-24 09:32:57.791 RingBuf(/video/ 
>> media2/1006_20090423203000.mpg) Error: File I/O problem in  
>> 'safe_read()'
>> eno: Input/output error (5)
>> 2009-04-24 09:32:57.854 RingBuf(/video/ 
>> media2/1006_20090423203000.mpg) Error: File I/O problem in  
>> 'safe_read()'
>> eno: Input/output error (5)
>> 2009-04-24 09:32:57.919 RingBuf(/video/ 
>> media2/1006_20090423203000.mpg) Error: File I/O problem in  
>> 'safe_read()'
>> eno: Input/output error (5)
>> 2009-04-24 09:32:57.920 RingBuf(/video/ 
>> media2/1006_20090423203000.mpg) Error: File I/O problem in  
>> 'safe_read()'
>> eno: Input/output error (5)
>> 2009-04-24 09:32:57.982 RingBuf(/video/ 
>> media2/1006_20090423203000.mpg) Error: File I/O problem in  
>> 'safe_read()'
>> eno: Input/output error (5)
>> 2009-04-24 09:32:58.045 RingBuf(/video/ 
>> media2/1006_20090423203000.mpg) Error: File I/O problem in  
>> 'safe_read()'
>> eno: Input/output error (5)
>> Rebuilt
>>
>> Finished commercial break flagging at Fri Apr 24 09:32:58 2009
>>
>> The files have the correct length but I can not view them past the  
>> erroneous end marker. If I try to skip past where the recording  
>> wants to stop, it will play for a second or two then return to the  
>> programs screen. The preview thumbnail will continue to play past  
>> where the file tries to stop, so I know that the whole episode was  
>> recorded.
>>
>
> I had something similar to this start happening to me a couple of  
> months ago, with shows that my cable company broadcast on its CBS HD  
> channel. I traced it to something having to do with xvmc, but didn't  
> have the patience to try to solve the problem; so now whenever I  
> need to watch one of those shows I temporarily change my playback  
> profile from 'CPU--' to 'High Quality' or something like that, and  
> change it back when I'm done watching. This may not be your problem,  
> of course, but you ought to use it as a troubleshooting technique;  
> does the recording play fine if you change the playback profile? For  
> that matter, have you tried playing the recording outside of the  
> MythTV player?
>
> On a tangential question related to my comment above, is it possible  
> to set up recording profiles so that they will automatically be  
> applied to recordings from particular channels (or storage groups)?  
> I.E. tell Myth to "use 'High Quality' for everything recorded from  
> channel 2.1 (or for a given storage group) and CPU-- for everything  
> else," so I don't have to be always manually switching it?
>
> Jarom McDonald
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

Unfortunately, switching the playback profile from CPU+ to High  
Quality had no effect. The playback stopped in the same spot.

The last time this happened to an episode and MythTV transcoded said  
episode, it changed the length from 30 minutes to 2 minutes, which is  
why I thought that the end marker was being places in error. I tried  
again on one of the recordings and it again erroneously marked the end  
of the file and discarded the 27 minutes of show after the problem area.

I tried playing another file with the same issue through Mplayer, and  
it would not play through. When it would stop, it would kick back a  
"Cannot sync MAD frame" error.

I pulled some logs and sent them here -> http://mythbuntu.pastebin.com/ffd9e82a

On William's suggestion, I tried to run the optimize_mythdb.pl, but I  
can't. If it is because I am not even close to running it the right  
way, feel free to laugh.

mythserver at mythserver-desktop:/usr/share/doc/mythtv-backend/contrib$  
bash optimize_mythdb.pl
optimize_mythdb.pl: line 14: use: command not found
optimize_mythdb.pl: line 15: use: command not found
optimize_mythdb.pl: line 18: syntax error near unexpected token `('
optimize_mythdb.pl: line 18: `    my $Myth = new MythTV({'connect' =>  
0});'

Since I am using Mythbuntu, the script is in the wrong spot, but it  
will not run. I would copy the file to /usr/share/doc/mythtv-docs-0.21/ 
contrib but there is no folder like that on my install. I would assume  
the script would run even in another directory, but I wouldn't be  
surprised if I made a horribly wrong assumption. If I hit the  
"Optimize Tables" button in MCC, it will bring up a terminal and say  
it is running and repairing everything. When running Optimize through  
MCC, the only remaining recording I had with this issue now displays  
as only being 2 minutes and change, but the file size is still 1.1 gig

I appreciate all the help so far.