[mythtv-users] Missing --passthrough option in mythtranscode

[Paul Gardiner]

On 06/06/2011 10:45, Jean-Yves Avenard wrote:
> On 6 June 2011 19:34, Paul Gardiner<lists at glidos.net>  wrote:
>> I'm on 0.24.1, but my copy of mythtranscode doesn't seem to accept
>> --passthrough or -P.  I can see some relevant looking changes that
>> went into the fixes/0.24 branch before the 0.24.1 tag. Also I can't
>
> passthrough option was only added to master, and is my backport 0.24 branch.
>
> Certainly not in vanilla fixes/0.24.
>
> The passthrough option, I have to say, I have no clue if it works, nor
> if it is usable.
>
> I tested it in FIFO mode only, and I find it useless as timestamps are
> completely lost.

Thanks for reply. Are not timestamps lost in fifo mode in any case? I
assume in fifo mode, mythtranscode has to make sure it generates exactly
the right number of audio sample to match the number of frames it puts
out, dropping from or inserting to one of the other to keep sync, in the
case there is a temporary fault in the stream. That must be possible
because presumably a player has to do the same thing, and in fifo
mode, mythtranscode is more or less playing the movie to the pipes. I
don't know much about ac3 etc., but imagined the same was possible
by counting packets.

Having said that, when I first tried fifo mode the other day, I was
expecting sync problems, but - once updated to 0.24.1 to get your
nice fixes - I didn't: I seem to be getting perfect sync and
frame-accurate cutting. I guess that may be just because the recordings
I'm working from have no drop outs.

In any case, it sounds like I should give your backport 0.24
branch a go. I'll report back.

Cheers,
	Paul.