[mythtv-users] Important recoding damaged - anything I can do?

Damian myth at surr.co.uk
Thu Jun 28 20:14:28 UTC 2012


> On 28/06/12 4:26 PM, Nick Rout wrote:
>> On Thu, Jun 28, 2012 at 6:19 PM, Damian<myth at surr.co.uk>  wrote:
>>> Hello all,
>>>
>>> My kids were on a BBC1 TV program about Glastonbury festival a couple of
>>> years ago. The recoding has survived various Myth problems and re-installs,
>>> but I now fear that I've lost it for good.
>>>
>>> I have tried and failed to 'export' this file into a more usable format
>>> several times over the years I have had it. Exporting a recording from
>>> MythTV seems to be one of the hardest things to do for some reason, but I'm
>>> not here to complain. Just want to see if there's anything I can do from
>>> here.
>>>
>>> I got the impression from a recent thread that creating a cut list and
>>> trascoding a recording with 'lossless' quality would create an MPG file (as
>>> opposed to an nuv). I did that a few days ago. The job seemed to take a very
>>> long time, but I was happy to see that it was no longer in the job queue the
>>> following morning.
>>>
>>> Running mythlink.pl showed me that the file was still an nuv file.
>>>
>>> Last night, I thought I'd try it again, but found a problem. The recording
>>> is still there from within MythTV, but only partially. If I play the
>>> recording, it just closes after about 15 minutes. I obviously tried this
>>> several times and have also tried playing the file using VLC from a Windows
>>> machine. The file seems to be damaged.
>>>
>>> I doubt there's anything that I can do, but would love to hear if any
>>> recovery is possible.
>> I assume you don't have the original file from before you did the
>> transcode to nuv?
>>
>> Anyway have you tried something like
>>
>> ffmpeg -i damagedfile.nuv -vcodec copy -acodec copy newfile.nuv
>>
>>
> Similarly, mencoder may be able to help with the forceidx flag to 
> rebuild the index if the data is there, for example this script:
> http://www.mattgrill.com/2009/03/converting-nuv-mythtv-video-to-avi-divx-without-transcoding/
>
>     |#!/bin/bash|
>     |video="$1"|
>     |mencoder -ni -oac mp3lame -ovc copy -vf harddup -noskip
>     -skiplimit 0 -o test.avi "$video"|
>     |mv "$video" "$video.done"|
>     |newvideo="${video/%nuv/avi}"|
>     |mencoder -forceidx -oac copy -ovc copy -aspect 16:9 -o
>     "$newvideo" test.avi|
>     |rm test.avi|
>
> It would be worth hunting in the logs to see if you can find any 
> reference to this transcode job, see if any error was reported.
>
> I would also make a backup copy of whatever copies of the file you 
> still have before running ffmpeg/mencoder/anything on it, just in case 
> anything else goes wrong and makes it worse. Depending on how much 
> other writing's happenned to the drive, you could even look into 
> un-delete tools to see if you can get the original back ( I personally 
> haven't tried this on linux, so can't really help much here ).
>
> Andrew

Update,

An incredibly kind stranger called John from this newsgroup found a 
place where I could download the file. A quick torrent later and I have 
the footage of my family back.

Needless to say, I am incredibly grateful!!

Thanks
Damian


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