[MPlayer-users] mencoder Audio Quality
D Richard Felker III
dalias at aerifal.cx
Tue Mar 4 08:09:43 CET 2003
On Mon, Mar 03, 2003 at 11:43:34PM -0700, Christopher Mason wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> I'm a relative newbie to mencoder. I've read quite a bit of the website
> and have been able to produce (using three pass encoding) AVIs that look
> quite good. I'm struggling with audio quality though. I've tried two
> different source DVDs and two different sets of LAME compression options.
> Both sound tinny, and have a definite high pitched noise component. At
> first I thought this was because my MP3 bit rate was not high enough. But
> the latest rip I did had an average bit rate greater than 150kbps. I've
> noticed that both DVDs are recorded at 48khz. This bit rate is preserved
> in the MP3 audio track. I'm wondering if maybe the software sample rate
> conversion is poor (I'm using MacOS X) and is contributing the tinny sound
> and noise artifacts. Should I be applying sample rate conversion in the
> making of the AVI? Will this be better than the SRC done at playback time
> (I've tried both vlc and quicktime)? If so, what options should I use?
Try -srate 44100 to resample. You should be able to get great audio
quality at ~110 kbit/sec average using vbr audio (in most movies;
obviously you'll need higher for a musical or something).
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