Hallo > this seems like a simple question so i am sorry if it > has already been answered. i have looked over the archives > earlier in the week, it is down right now, and the search function > of sf archive's sometimes leaves me feeling lacking.
Please read the section a second time: > A quality factor should be chosen that way that the mplex output of > Peak bit-rate and average bit-rate differ by about 20-25%. If the > difference is very small < 10%, it is very likely that you have done > something wrong. It is very likely that you have chosen the wrong > values for the maximal bitrate or a quality factor that is too high. --END-- > 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 read where you can do the math to figure out what it was. > files size/ length of video = average rate ( basically ) > > my problem could be that i only have the mpeg files that already > have been mplexed with the audio in them. i think that is messing > up my computations. If you have a multiplexed stream, you are a bit out of luck with mplex. You would have to demux it, and remultiplex it, bat that is a bit to time consuming. 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) 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 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. > my basic goal is transfering DV tape to DVD, the tapes are home movies. > i want high quality, but dont want to be wastefull. encoding time isnt > a real issue, because i am not in a hurry. So you should see the average bitrate when you multiplex the stream. You should try it first with some shorter sequences (5-15 Minutes) with differnet settings. And view them, if you like the quality. 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
