[mythtv-users] Repairing corrupt recordings with dd

[DaveD]

On 6/23/20 3:09 PM, John Pilkington wrote:
> On 23/06/2020 15:21, DaveD wrote:
>> A while back (few weeks?) someone posted info about a technique to 
>> strip the first few megabytes from the beginning of a recording using 
>> dd.  It involved a discussion about the new video rendering system 
>> crashing the frontend (or casing decoder errors) on recordings where 
>> the format changes soon after the recording starts.  I swear I saved 
>> that message somewhere because I have a lot of those (thanks to 
>> Comcast and my firewire recordings) but I'll be dipped if I can find 
>> it. I've searched the archives, too, with no luck.  I could probably 
>> figure it our from the dd man page, but thought I'd ask for a re-post 
>> of that info since it's a tried and tested method. Thanks,
>>
>> Dave D.
>>
> I think you might be remembering this:
>
> https://code.mythtv.org/trac/ticket/13557#comment:13
>
> which looked for an appropriate skip value. applied it, and then 
> rebuilt the seektable.  The output file doesn't start at a keyframe, 
> but that doesn't seem to matter.
>
> John P

That's it!  No wonder I couldn't find it in my old emails.  It was in my 
bookmarks.  Thanks you!

Dave D.