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Re: transcoding flv to mp4

On Tue, 5 Oct 2010 22:11:32 +0200
Jochen Schulz <ml@well-adjusted.de> wrote:

> Celejar:
> > On Tue, 5 Oct 2010 18:58:05 +0200
> > Jochen Schulz <ml@well-adjusted.de> wrote:
> >> 
> >> ffmpeg uses a fixed default for geometry (-s) and quality (-sameq,
> >> -qscale, -vb etc.). You have to set both explicitly if you need anything
> >> else (which you usually do).
> > 
> > Thanks.  Is there a tutorial for simple transcoding that you can
> > recommend?
> Unfortunately, no. My experience (limited to transcoding DVD material)
> is that there is no single command line that delivers a good
> quality/time trade-off for all input files.

I don't even care that much about time; I can let the commands run in
the background, or when I won't be using the system.

> > I don't have the time or interest for anything fancy, just
> > basic transcoding between formats, preserving as much of the quality of
> > the original as possible.
> Check out Handbrake. It lets you choose from sensible presets, IIRC.

Ron also recommended it; I'll have to take a look.

> > And shouldn't there be a simple switch or option that does pretty much
> > that, i.e., "change the format, but keep the size and quality as close
> > as possible to the original"?
> >
> > And why on earth is the default behavior to multiply the size by a
> > factor of four just to retain the same quality?  Is mp4 really such an
> > inferior format to flv that this is required to retain the level of
> > quality?
> No, but encoding from one lossy format to another with as little loss as
> possible is a task quite hard. In my opinion, -sameq has little or no
> use for real-life usage. Use qscale or something like that and see what
> you get.
> > Apologies in advance if these are naive questions, but I know little
> > about this, and transcoding seems to be a sufficiently complex and
> > arcane subject that simple web searching will only take one so far.
> Your impression matches mine. :)


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