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 You only have to multiplex the files. Maybe there is a switch that records that output info, or you multiplex it manualy.
> > 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. 7500kbps is the default maximum for DVD mpeg2enc sets. > > 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. Thats correct. Usually only MPEG1 Videos are CBR. If you encode a MPEG2 Video you will always have a VBR video. MPEG2 is by default VBR. If you forget the -V option when multiplexing a VBR stream mpeg2enc will create a files as large as the maximal video bitrate + audio bitrate. If you calculate than the average bitrate it seems that you have a CBR stream. > > 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 > thanks again for taking the time with my simple question No problem. auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
