Work-around #4 1) Export for AppleTV 2) Export for iPod 3) Two different feeds
Bill C. http://BillCammack.com --- In videoblogging@yahoogroups.com, "wazman_au" <[EMAIL PROTECTED]> wrote: > > Stupid bloody Apple, why do they DO things like this???? > > Folks, this is a tough one, and yes, I've read through the Casey-initiated thread. Good start > but sadly optimistic. > > The question is, how do we pump out vids that are 640x480 and have the "baseline low- > complexity" profile, thus being both iPod and (presumably) Apple TV compatible? > > Baseline can be selected when exporting with your own settings, but the "low-complexity" > sub-option cannot. According to Apple's developer spec, low-complexity has been defined > by Apple for the iPod, and it seems to be restricted to the Export for iPod option, which > cannot be configured. > > When exporting an iPod video, QuickTime chooses automatically whether to use "baseline" > or "baseline low-complexity" - in a nutshell, anything upwards of 320x240 gets low- > complexity. Gory details here: > > http://developer.apple.com/technotes/tn2007/tn2188.html > > Three possible workarounds. I am not in front of QTPro right now so will try later: > > 1) Use the Export for iPod option with the source vid sized at 640x480 - this will goad > QTPro into using low-complexity - and then find some way of saving the resulting video > _again_ with a chopped-down bitrate, perhaps by doing a "Save as ..." but without re- > encoding. > > 2) Do it the other way round - export at the bitrate etc. that you want, then run it through > the iPod export. The developer spec suggests QT iPod exporter using a 640x480 source > file will pick its own bitrate according to a complex formula ("DR = { (nMC * 8 ) / 3 } - 100" > I kid you not, check out the developer link above) between 700 and 1500kbps. But maybe > if the source file is already lower, it won't jump up the bitrate too shockingly. The MC in > the equation stands for "macroblock" and if the number of these can be reduced in the > source file (how? Dunno) then, doing the maths, you are headed for a smaller result. > > 3) Resize your source video to 640x480, whack it through Export for iPod and hope the > filesize is not too bloated. As in the formula above, this should produce something > between 700kbps and 1500kbps, although Apple doesn't say whether the audio is > included in that bitrate (AAARGH!). > > I found to my horror this afternoon that my carefully crafted 640x480 recipe with > meticulously pared down video and sound bitrates that delivered a file of 5MB/minute that > looks alright on the telly via laptop S-Video cable doesn't work on the iPod. > > I am just about ready to tell Apple where to shove their TV box ... and all of the above still > leaves the question unanswered: will the aforementioned oblong suppository PLAY H.264 > BASELINE LOW-COMPLEXITY??? > > Anyone got one of these boxes? > > That's all for now. I know none of the above is tested but I thought I'd post now while my > blood is up, and to give others the chance to look for a solution. > > Waz from Crash Test Kitchen > http://www.crashtestkitchen.com >
