Re: [Mjpeg-users] average higher than max
Hi, On Tuesday 02 December 2003 07.14, Bernhard Praschinger wrote: > Hallo > > > > >INFO: [mplex] Average bit-rate : 9497200 bits/sec > > > >INFO: [mplex] Peak bit-rate: 9019200 bits/sec > > > > > > Basically it is 'peak' number thats wrong (it tends to underestimate a > > > little). > > > > But other than that, and if the peak is below the max value specified by > > the DVD standards, it should be ok on standalone DVD players, right? > > Right. > I was playing around with the new mpeg2enc. When encoding with -f 4, I received a peak rate of around 3 Mb/s while the avarage was far lower: 2 Mb/s. The SVCD palyed fine on a standalone player. Nevertheless, isn't this result strange? Michael --- 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
Re: [Mjpeg-users] average higher than max
Hi, > I was playing around with the new mpeg2enc. When encoding with -f 4, I > received a peak rate of around 3 Mb/s while the avarage was far lower: 2 > Mb/s. The SVCD palyed fine on a standalone player. Nevertheless, isn't this > result strange? This sounds 100% right. For short bursts the decoder data-rate can greatly exceed the actual mux_rate - the encoder is 'running down' the demux buffer in the decoder. For SVCD this is actually quite large around 1 second of play, whereas the peak-rate is calculated over a rather smaller range (around 0.5 second). Andrew --- This SF.net email is sponsored by OSDN's Audience Survey. Help shape OSDN's sites and tell us what you think. Take this five minute survey and you could win a $250 Gift Certificate. http://www.wrgsurveys.com/2003/osdntech03.php?site=8 ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
[Mjpeg-users] Aspect Ratio Confusion
I'm rendering an animation that will eventually be displayed on a 16:9 screen that has a resolution of 1024x768. In order for this to look right, it seems I need to render my animation in a different resolution (on the PC), and then scale it to 1024x768 so that it will display right on a 16:9 screen. However, I am utterly confused as to how to do this calculation. Anyway know? Thanks, Jon --- This SF.net email is sponsored by OSDN's Audience Survey. Help shape OSDN's sites and tell us what you think. Take this five minute survey and you could win a $250 Gift Certificate. http://www.wrgsurveys.com/2003/osdntech03.php?site=8 ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] Aspect Ratio Confusion
On Tue, 2 Dec 2003, Jonathan Bartlett wrote: > I'm rendering an animation that will eventually be displayed on a 16:9 > screen that has a resolution of 1024x768. In order for this to look Hmmm, 1024x768 is 4:3 so I'm a bit confused what is meant by "16:9 screen ... resolution of 1024x768" Is this going be played from a DVD? If so then the letterboxing will usually be done by the DVD player. > right, it seems I need to render my animation in a different resolution > (on the PC), and then scale it to 1024x768 so that it will display right > on a 16:9 screen. However, I am utterly confused as to how to do this > calculation. Anyway know? The (small amount of) composing I've done was by creating the artwork at 720x540 and scaling to 720x480. This was for a normal (4:3) movie. Alternatively it could have been done at 704x528 and scaled to 704x480 (which is another valid DVD resolution). I've not done any widescreen creation... Widescreen NTSC is 854x480 so I think the proceedure is the create the data at that resolution, scale to 720x480 and set the aspect to 16:9 (-a option of mpeg2enc). Now PAL widescreen is 1024x576 so you'd create the input at that size and scale to 720x576 and set the 16:9 aspect. If you're not going to a DVD but simply playing via the video out then perhaps tinkering with the player's aspect/scaling options can do what is needed (MPlayer has a lot of them). Not something I've done anything with though. Steven Schultz --- This SF.net email is sponsored by OSDN's Audience Survey. Help shape OSDN's sites and tell us what you think. Take this five minute survey and you could win a $250 Gift Certificate. http://www.wrgsurveys.com/2003/osdntech03.php?site=8 ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] Aspect Ratio Confusion
> Hmmm, 1024x768 is 4:3 so I'm a bit confused what is meant by > "16:9 screen ... resolution of 1024x768" Yes, it's a really wierd system. It's a computer monitor that runs at 1024x768, but the actual screen dimensions are 16:9, meaning that the pixel aspect ratio is really screwy, especially for a computer monitor. The video is going to be played from an MPEG file on the computer by Windows Media Player. Jon --- This SF.net email is sponsored by OSDN's Audience Survey. Help shape OSDN's sites and tell us what you think. Take this five minute survey and you could win a $250 Gift Certificate. http://www.wrgsurveys.com/2003/osdntech03.php?site=8 ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] Aspect Ratio Confusion
Hallo > I'm rendering an animation that will eventually be displayed on a 16:9 > screen that has a resolution of 1024x768. In order for this to look > right, it seems I need to render my animation in a different resolution > (on the PC), and then scale it to 1024x768 so that it will display right > on a 16:9 screen. However, I am utterly confused as to how to do this > calculation. Anyway know? Just as Steven said ;) You have to use very likely the --no-constraints option. Else mpeg2enc does not encode at a higher resolution than 720x576, and only up to bitrates of 10MBit. > Yes, it's a really wierd system. It's a computer monitor that runs at > 1024x768, but the actual screen dimensions are 16:9, meaning that the > pixel aspect ratio is really screwy, especially for a computer monitor. > The video is going to be played from an MPEG file on the computer by > Windows Media Player. If you have to play it back with that player you have to use a MPEG1 Video, and cannot use MPEG2 which works better (smaler files) for high resolutions. Or use some other player that can playback MPEG2 (DVD-Player SW, or VLC for example) 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 OSDN's Audience Survey. Help shape OSDN's sites and tell us what you think. Take this five minute survey and you could win a $250 Gift Certificate. http://www.wrgsurveys.com/2003/osdntech03.php?site=8 ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
