[mythtv] Cutlist editor is broken in 0.21 'bleeding' builds from atrpms

Martin Long mythtv at longhome.co.uk
Sat Feb 17 01:20:04 UTC 2007

Has anyone got any further with this?

I've applied this patch, and it seems to do the trick. I guess that it's
just telling the decoder not to die if the mpeg stream is a bit messed up -
which with DVB it often is. 

My wife was starting to get a bit narked that 1 in 3 times when she was
skipping ad's, the box would completely lock-up. Then I found that mythweb
was causing mythbackend to lock-up when asking it for preview pictures
(requiring use of the decoder to generate new ones), and was grabbin 99.9%

I'm guessing that this is possibly something that needs posting on a ffmpeg
forum somewhere right?


-----Original Message-----
From: mythtv-dev-bounces at mythtv.org [mailto:mythtv-dev-bounces at mythtv.org]
On Behalf Of John Pilkington
Sent: 15 February 2007 13:28
To: Development of mythtv
Subject: Re: [mythtv] Cutlist editor is broken in 0.21 'bleeding' builds
from atrpms

David Matthews wrote:
> John Pilkington wrote:
>> This is essentially a repost from 1 February, but after a new myth build 
>> and under a new kernel. The symptoms are unchanged.  Recordings are from 
>> DVB-T in the UK.
>>> The cutlist editor is now broken.  It was OK in 
>>> r12545, one of Axel's earlier 'bleeding' releases for FC5. 
>>> After a few adjustments of step size and skipping backwards and forwards
>>> the editor suddenly becomes unresponsive and mythfrontend CPU usage as
>>> shown by 'top' reaches 95% or more.
>>> Frontend log shows:
>>> 007-01-31 14:35:30.242 TV: Changing from None to WatchingPreRecorded
>>> 2007-01-31 14:35:30.265 The realtime priority setting is not enabled.
>>> 2007-01-31 14:35:30.579 Video timing method: SGI OpenGL
>>> [mpeg2video @ 0x5ee91e4]current_picture not initalized
>>> 2007-01-31 14:35:39.019 AFD Error: Unknown decoding error
>>> [mpeg2video @ 0x5ee91e4]current_picture not initalized
>>> 2007-01-31 14:35:39.528 AFD Error: Unknown decoding error
>>> [mpeg2video @ 0x5ee91e4]current_picture not initalized
>>> 2007-01-31 14:35:41.345 AFD Error: Unknown decoding error
> I upgraded to the latest svn recently and started seeing these symptoms 
> when fast forwarding a recording or skipping forward.  After a few of 
> these log messages the frontend would freeze and the only option was to 
> kill it.  I traced the problem to the ffmpeg update in 12645 and some 
> code that was added to libs/libavcodec/mpeg12.c .  I ifdef'd it out and 
> it fixed the problem.  It doesn't seem to have had any adverse effects.
> I don't know enough about the interaction between mpeg12.c and the 
> higher levels to know the right way of dealing with this so I'm not 
> proposing this as a patch to myth.  I suspect the problem has to do with 
> mpeg streams with errors.  Due to having a slightly noisy signal there 
> are always a few mpeg errors reported in my log.
It's certainly quite possible that the basic problem is a corrupt mpeg 
stream.  I just successfully edited the most recent recording that gave 
trouble, after passing it through a lossless transcode.  Of course, that 
has a habit of erroring out too, but mencoder will usually work - more 

Thanks for the comments.

John P
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