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Re: [MPlayer-users] Encoding from DVB-T mpeg-ts recordings

To: "MPlayer usage questions, features, bugreports" <mplayer-users@xxxxxxxxxxxx>
Subject: Re: [MPlayer-users] Encoding from DVB-T mpeg-ts recordings
From: D Richard Felker III <dalias@xxxxxxxxxx>
Date: Mon, 4 Oct 2004 11:46:37 -0400
Delivered-to: itdp@localhost
Delivered-to: mplayer-users@mplayerhq.hu
In-reply-to: <20041004052119.21f00383.rcooley@spamcop.net>
References: <415FD11B.5080704@uts.edu.au> <415FD5D3.6040202@tiscali.it><415FEA66.6040802@eng.uts.edu.au><20041004052119.21f00383.rcooley@spamcop.net>
User-agent: Mutt/1.3.25i 
On Mon, Oct 04, 2004 at 05:21:19AM -0700, RC wrote:
> On Sun, 03 Oct 2004 22:02:46 +1000
> Samson Lee <samson.lee@xxxxxxxxxxxxxx> wrote:
> 
> > ===== Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
> > Does that mean mp3 or mp2?
> 
> That particular message doesn't tell you which it is, only that it's one
> of the two. You could probably find out, using "-identify".
> 
> > Also, is it possible to do a perfect mp2 to mp3 transcode? If so, how?
> > 
> > If not, what's the closest?
> 
> Well, the only way to not loose any quality, without increasing the size
> of the audio, is to keep it as it is.  There's no way to perfectly
> convert between lossy codecs, but converting between similar codecs
> (like mp2/mp3) doesn't introduce too much loss... Certainly not as much
> as converting between entirely different codecs.

actually a direct mp2->mp3 transcoder should be possible, perhaps with
no loss. iirc mp2 is a subset of mp3 for the most part.

rich

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