Audio/Video Out of Sync

[Jim web]

I now have some info that helps me understand the 'missing audio' problem
with the hvfhd fetched files.

I've been told that the root cause is that these use HE-AAC which the MPEG2
TS spec can't correctly describe. So it is called aac-lc and it is left to
the client program to recognise the actual codec.

This explains why ffprobe can find it as it checks the actual streams. But
apparently my copy of vlc (which uses the distro installed avconv) doesn't,
and then can't make sense of the audio.

I'll git and build a current version of ffmpeg as it is about time I did
this anyway. But the gip related question this raises in my mind is that,
having done this, how best to have gip use such a new version for its
after-fetch conversions? I'm hoping that will then allow it to generate mp4
files from the ts fetched which correctly describe the audio format.

 I'll have a look at the webpages, etc, but don't know if they deal with
this. So maybe someone here can say?

FWIW Usually I leave the distro installed versions of such things in place
and just keep a copy of the 'new' ffmpeg/ffprobe/ffplay in a user directory
and call them from there. This avoids upgrading in a way that breaks
something else, and means I can easily compare different versions.

That said, the xfce Mint distro on my 'AV' machine seems to have avconv
installed, but not the ffmpeg family. Need to check that, though.

Jim

-- 
Electronics  http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Armstrong Audio  http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc  http://www.audiomisc.co.uk/index.html