[mythtv-users] Burning DVD with MythArchive : mutiple audio streams : nuvexport : avidemux : projectx

Mark Paulus mark.paulus at verizonbusiness.com
Wed Dec 6 14:57:02 UTC 2006

John Pilkington wrote:
> Paul Harrison wrote:
>> John Drescher wrote:
>>> On 11/22/06, *John* <jharitos at yahoo.com <mailto:jharitos at yahoo.com>> 
>>> wrote:
>>>     I'm having a horrible success rate in burning DVD
>>>     using MythArchive as I'm getting maybe 1 in every 10
>>>     recordings to burn. From looking at the log files it
>>>     looks like the audio/video gets out of sync causing
>>>     mplex to drop too many frames thus resulting in an
>>>     error. I have 'Allow MythTranscode" set which states
>>>     it'll fix sync issues but it must not be working.
>>> This never worked for me and in my opinion this actually it works 
>>> against you. The problem is that mythtranscode creates audio video 
>>> sync problems. A few months ago (just before the release of 0.20) I 
>>> filed a bug report that each commercial cut caused av sync problems. 
>>> The bug was verified and a patch was made to mythreplex that attempts 
>>> to fix the damage that mythtranscode has done. The problem is that 
>>> this fix does not always work so I use projectX to cut my recordings 
>>> and I have modified the main script to use projectx to do the demux 
>>> instead of mythtranscode. For me this never fails but it adds a few 
>>> other steps to the process.
>>> John
>> Hi John,
>> If you could modify mythburn.py to _optionally_ use ProjectX to do the 
>> commercial cutting and demuxing I would be happy to apply it. The 
>> important thing is that projectX should be an optional install and only 
>> used if the user wants it and has it installed. I would rather that 
>> mythtranscode was fixed but no one who has the knowledge to do it is 
>> interested enough to fix it. Using projectX would also enable other 
>> features like adding subtitles to be possible in the future.
>> Paul H.
> Hi: I've asked earlier about DVB-T broadcasts with multiple audio 
> streams that get swapped by mythtranscode so that the main one gets lost 
> later in the mytharchive process.  I now have what looks like a working 
> installation of projectx but haven't yet figured out how to use it.
> Meanwhile I've tried avidemux and nuvexport on fresh recordings.  Both 
> will return files with only the  main audio track, but the a/v sync can 
> be several seconds out at the end of an hour.  Not sure yet if this is 
> constant throughout the recording - probably not, but sometimes there 
> hasn't been much on-screen speech.
> Does anyone have suggestions of an output format available from either 
> avidemux or nuvexport (or ???) that might retain sync and be a suitable 
> intermediate stage in DVB to DVD for these programmes?
> Thanks in advance
> John Pilkington
For doing MPEG TS==>PS transcoding for recordings from my Air2PC card, 
and for some other AVI==>MPEG2 transcoding, I have found that using
ffmpeg -target ntsc-svcd manages to keep my audio/video in sync.

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