[mythtv-users] lossless_cut issue with UK HD recordings

[John Pilkington]

On 02/03/15 23:21, Grzegorz Sikorski wrote:
> Thanks, I will give it a try. I have only Celeron J1800 machine, so I
> wanted to avoid transcoding, but if this is the only way, I will do it.
>
> On 2 Mar 2015 23:09, "Paul Gardiner" <lists at glidos.net
> <mailto:lists at glidos.net>> wrote:
>
>     On 02/03/2015 22:36, Grzegorz Sikorski wrote:
>
>         Hi,
>
>         I have tried to use lossless_cut tool with my MythTV setup. This
>         tool is
>         great and it works perfect for all my SD channels recording.
>         However I
>         could not get proper output mkv video for any UK Freeview HD
>         channels. I
>         got properly cut movie, but with destroyed audio (it is not
>         playable on
>         any player, tried VLC, Totem and even Windows Media Player).
>         Some movies
>         have audio broken (VLC displays error message on audio path),
>         some have
>         just "silent" path. After some deep search I found this topic:
>         https://tvheadend.org/boards/__5/topics/6808
>         <https://tvheadend.org/boards/5/topics/6808>. It seems the audio
>         cannot be
>         properly played since UK broadcasters change audio codec during
>         transmission (e. g. switching codecs between commercial brakes and
>         actual movie). Could anybody confirm this is a related issue? If
>         so, is
>         there any known workaround?
>
>
>
>     For UK Freeview HD, one way that works well is to use mythtranscode in
>     fifo dir mode run into ffmpeg. Shame to decompress and recommpress
>     again, I know, but the results are good. There's an example script
>     here:
>     http://www.mythtv.org/wiki/__Example_Script_using___mythtranscode_in_fifodir_mode
>     <http://www.mythtv.org/wiki/Example_Script_using_mythtranscode_in_fifodir_mode>
>     that can be set up as a user job.

Alternatively, you might try MythDVBcut, which does no transcoding.  I 
use it mostly for SD, with project-x and java, but for HD it just cuts 
at video keyframes using a python script.  I run it in a terminal window.

https://www.mythtv.org/wiki/MythDVBcut