[mythtv-users] Alternatives to lossless transcode

[Paul Gardiner]

On 25/11/2013 05:09, Mark Perkins wrote:
>
>
>  > Date: Mon, 11 Nov 2013 10:46:47 +0000
>  > From: lists at glidos.net
>  > To: mythtv-users at mythtv.org
>  > Subject: Re: [mythtv-users] Alternatives to lossless transcode
> ...
>  > There's a --honorcutlist option (which my script uses). That will remove
>  > the commercials... well I guess you need to go into the cutlist editor
>  > and tell it to apply the commercial flagging as a cutlist, but I thought
>  > you had to do that with lossless transcode too. There's also a
>  > --cleancut option that improves cutting by doing the last 200ish frames
>  > of each cut by skipping rather than trying to jump to the exact end.
>  >
>  > Cheers,
>  > Paul.
>  > _______________________________________________
>
> Paul, can you clarify please what happens with the --cleancut option?
> Does the skipping only work if the transcode output is placed back into
> the Storage Group in place of the original recording, and not in 3rd
> party programs like Windows Media Player? Is the intention of --cleancut
> essentially to minimise the chance of missing a few seconds of viewing
> around the cut boundaries if a mistimed (incorrect) cutpoint is created
> during commflag detection?
>
>  From the brief description it would seem that --cleancut would leave 8
> sec (200 frames at 25fps?) of commercial in at each boundary which seems
> like a lot, is there a switch to drop it back to say 1 sec or so?

The cleancut option doesn't alter the cuts. The same sections of audio
and video will be missing from the fifo streams as without the option.
It changes only the internal mechanism by which mythtranscode achieves
the cuts. Without the cleancut option, mythtranscode gets mythplayer
to perform a seek from the start of the cut to the end. That can lead
to a moment of audio and video being slightly out of sync. Mythtranscode
quickly corrects the sync, but there can be a noticeable hiccup. With
the cleancut option, mythtranscode performs the cutting by seeking to a
point a little before the end of the cut, and then dropping audio and
video until the true end of the cut is reached.

Paul.