[FFmpeg-user] -istoffset and -vcodec copy

Carl Eugen Hoyos cehoyos at ag.or.at
Sun Nov 27 04:16:47 CET 2011

Jonathan Addleman <jono <at> redowl.ca> writes:

> >>  However, if I re-encode the video by removing '-vcodec copy' from the
> >>  commandline, the itsoffset works as expected. Of course, I don't want to
> >>  re-encode the video, since it reduces the quality too much.
> >
> > You do realize that can re-encode both with no visible and with absolutely no
> > quality loss?

What I tried to write was:
1: You can re-encode with no visible quality loss (often without significantly
increasing the file size)
2: You can re-encode with absolutely no quality loss (identical output), that
usually means increased file size.

> Hmm.. apparently not... everything I've tried was very visible. But I'm 
> new to this! I must be doing *something* wrong, since even when I tried 
> the various -vpre lossless presets, it still looked horrible...

Command line and complete, uncut console output missing.

Carl Eugen

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