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

[Andrew Leech]

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

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