On Wed, 2003-11-26 at 08:43, Steven M. Schultz wrote: > On 26 Nov 2003, Florin Andrei wrote:
> > But most of the professional DVDs i've seen are at or around 9800 kb/s > > Not really. Or rather how are you determining that? By taking > the .m2v streamsize in bytes and dividing by the playing time? If No, because that would only compute the average. And the average seems to be, for DVDs in that class, between 3000-6000 I normally use 2 different methods: 1. Extract one title with tccat then probe it with tcprobe: tccat -i /dev/dvd -t dvd -P 1 > title1.vob tcprobe -H 100 -i title1.vob 2. extract .m2v and .ac3 then mux them with mplex and watch the messages Both methods provide consistent results across a large number of tests: the max m2v bitrate is always 9800 kbps with commercial DVDs. I actually thought the total max mandated by the DVD standard is 10.08 Mbps or something like that (and it's the sum of the actively played tracks, not of all the stuff in the VOB). So that would leave, above a 9800 kbps ceiling, some room for a 448 kbps audio track and still some more room to spare (subtitles). Is my information wrong? Where the heck can we find some better and more trustworthy information about the DVD standard? (no, i don't wanna pay money) > It's necessary to leave room for peaks or spikes in the bitrate - > exceeding the legal limit even briefly will cause playback problems Right, but as far as m2v and mpeg2enc, _isolated_ (disregarding DVD limits, other tracks, etc.), are concerned, -b sets a HARD limit, never to be exceeded, is that correct? I guess what i'm asking is, if you get all the numbers right, you should be safe on the m2v side, isn't it true? -- Florin Andrei http://florin.myip.org/ ------------------------------------------------------- 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
