[mythtv-users] Lossless Mythtranscode in 0.26

[John Finlay]

On 9/28/2013 2:33 AM, Anthony Giggins wrote:
> On 27 September 2013 19:03, John Finlay <finlay at moeraki.com 
> <mailto:finlay at moeraki.com>> wrote:
>
>     On 9/15/2013 12:38 PM, George Nassas wrote:
>
>         On 2013-09-15, at 2:10 PM, John Finlay <finlay at moeraki.com
>         <mailto:finlay at moeraki.com>> wrote:
>
>             I'm thinking of upgrading to 0.26 but I recall that there
>             was an issue with lossless transcoding using
>             Mythtranscode. Since this is a feature that I use I wanted
>             to find if this was still a problem or should I wait for
>             0.27 where I hope the problem is fixed.
>
>         I do lossless transcoding all the time and it's reliable now.
>         There is an issue where, when you cut the beginning of your
>         recording, myth doesn't play its audio but I haven't checked
>         if that's a bug in transcode or myth playback.
>
>         - George
>
>
>     I upgraded to 0.27 and lossless transcoding completes but creates
>     a file which seems to have damaged meta-information according to
>     ffmpeg/avconv but not according to mythffmpeg. The original file
>     gives the same info for both ffmpeg and mythffmpeg but after the
>     lossless transcoding they produce different results for bitrate
>     and duration. The transcoded file is playable within myth but vlc
>     thinks it's much shorter. Handbrake processes the tanscoded file
>     very slowly.
>
>     John
>
> I agree, initial testing of 0.27 seemed ok but further transcodes 
> result in the same issues as 0.26 :(
>
> I had raised http://code.mythtv.org/trac/ticket/11593 but I thought it 
> was fixed so it got closed I've asked this to be reopened perhaps add 
> some further details.
>
>
Yes that looks exactly like the problems I'm seeing where 
post-processing of a lossless cut file fails or produces unusable 
output.  I'm surprised that the metadata of the lossless cut file seems 
broken when viewed using mediainfo or ffmpeg/avconv. It seems that 
mythtranscode has a new format for mpeg-ps files that these other 
programs don't know.

John
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