[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%
CPU.
I'm guessing that this is possibly something that needs posting on a ffmpeg
forum somewhere right?
Martin
-----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
slowly!
Thanks for the comments.
John P
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