hello,
thanks for your reply,
On Mon, 2003-11-24 at 10:38, Bernhard Praschinger wrote:
> Hallo
>
> > i was wondering how i could determine the average bitrate. ??
> > ideally i would like program to tell me what it is.
> You can only answer that question after you have encoded and MultiPLEXed
> the stream with a audios stream.
> That that two most interrestin lines look like that:
> INFO: [mplex] Average bit-rate : 4281600 bits/sec
> INFO: [mplex] Peak bit-rate : 7093200 bits/sec
> ---END---
>
i have been using kino to encode and mplex my DV input.
i will start doing it from the command line in order to
access this info. thanks
>
> Programs like mplayer pint also out the maximal bitrate of the stream:
> VIDEO: MPEG2 720x576 (aspect 2) 25.00 fps 7500.0 kbps (937.5
> kbyte/s)
>
i have seen this, 7500 kbps is the default with kino when setup for dvd
output. so my original attempt looked like this one, except for fps.
> But that does not tell you the average bitrate. But you can easly
> calculate the average bitrate:
> filesize / (number of frame / framerate) = bytes/sec *8 = bits/sec
>
somehow i was getting off track , and will try again.
i am assuming if i dont select VBR in mpeg2enc ( -q flag)
then i am encoding in CBR, and my average bitrate = maximal bitrate.
?
> bits/sec is the value mplex prints out !!!!
> If you have a multiplexed stream you have to subtracts afterwards the
> bitrate used for audio and 1-2% mplex information.
>
this may have been where my calculations got off also.
mplayer says my audio is 224 kbit
> You should try it first with some shorter sequences (5-15 Minutes) with
> differnet settings. And view them, if you like the quality.
>
yes this is what i really need to do
> auf hoffentlich bald,
>
> Berni the Chaos of Woodquarter
thanks again for taking the time with my simple question
randy
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