[mythtv-users] Regression? 0.26+20130221 Time sync issues

[Peter Bennett (cats22)]

On 03/01/2013 05:07 PM, Frank Feuerbacher wrote:
> For some time now I have been capturing HD movies with mythtv,
> trimming them with Avidemux 2.5.6 and the encoding with Handbrake.
> About a week ago I applied
> 2:0.26.0+fixes.20130221.c3fff6e-0ubuntu0mythbuntu2 amd64. Now the
> resulting .mkv files are unusable. The audio and video are sped up and
> jerky. Handbrake reports many sync: audio time went backwards and
> other errors, resulting a numerous dropped frames. Viewing the .mpgs
> in Avidemux exhibits some audio problems.
>
I do not use avidemux for this because it does not handle variable frame
rates, and also does not handle well the occasional corrupted frame that
comes with video recording. Many shows in the USA are now variable frame
rate, one rate for the movie and another for the commercials. With
variable frame rates, avidemux will not be able to synchronize the audio.

I suggest using ProjectX for trimming the file and removing commercials.
After trying many tools I have found ProjectX to be best. You can cut
out sections, and ProjectX repairs the stream while writing (fixing out
of sequence errors, etc.). Output to M2P, then use that file as input to
handbrake.
ProjectX is not the most friendly tool, and while cutting you have to go
back and forth in the file when it tells you "not enough data in the
buffer", but ultimately has proved very reliable.
There is a newer version of ProjectX that is not yet available in the
Ubuntu repository, with some user interface improvements, although the
older version works perfectly well.

Peter