[mythtv-users] Alternatives to lossless transcode

mark perkins1724 at hotmail.com
Wed Nov 13 09:43:11 UTC 2013


On 12/11/13 20:42, Paul Gardiner wrote:

> Do you mean running my script or just running mythtranscode?
> Mythtranscode --fifodir run alone will stall eventually because the
> fifos will fill up. It will also stall if something reads from them
> unevenly. But, assuming you are running the script, you could easily
> be correct that whatever upsets --mpeg2 is also upsetting --fifodir.
>
> Cheers,
>      Paul.
> _______________________________________________

Sorry my mistake. I assumed that if I ran just mythtranscode --fifodir 
it would just output the two streams in their entirety to the nominated 
files. Trying your script now, for some reason my ffmpeg did not like 
the '-profile high' switch but have taken that out and it works.

The audio was much more in sync than previously, but it still just seems 
a little off. I ran mythDVBcut over the same file (which uses ProjectX 
and no mythtranscode) and the file generated by your script had a delay 
of 80ms (from mediainfo) versus 112ms from the ProjectX version. I'm not 
sure that -hand on heart- I could pick a difference in sync of 32ms but 
it did seem just that little bit out whereas the ProjectX file just 
seemed spot on.

Again the question probably is whether this is due to errors in the 
original recording or something else.

I'm updating my ffmpeg now and will re-try your script and see if that 
changes anything.



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