Mike, File size is the clincher. If you guys can find a way of letting the user tweak bitrate and other params, while still having 640x480 H.264 that works on both Apple Telly and the iPod, you are on a winner.
Waz --- In [email protected], "Mike Hudack" <[EMAIL PROTECTED]> wrote: > > Hey Waz, > > I'm afraid the secret sauce includes a dozen pages of signed legal > documents and some custom code :) not sure what kind of file size we're > talking... > > -----Original Message----- > From: [email protected] > [mailto:[EMAIL PROTECTED] On Behalf Of wazman_au > Sent: Monday, April 23, 2007 1:29 PM > To: [email protected] > Subject: [videoblogging] Re: Apple TV and iPod clash > > Mike, > > Great. How about sharing the secret with those of us who'd like to > encode the vids ourselves??? > > What sort of file size are we talking? Let's talk megabytes per minute > at 640x480. > > Waz > > --- In [email protected], "Mike Hudack" <mike@> wrote: > > > > Waz, > > > > Blip pro account holders soon won't have to worry about this :) We're > > hoping to have transcoding to an Apple TV + iPod compatible format > > available for pro users in our next release (about two weeks away). > > > > Yours, > > > > Mike > > > > -----Original Message----- > > From: [email protected] > > [mailto:[EMAIL PROTECTED] On Behalf Of wazman_au > > Sent: Sunday, April 22, 2007 3:30 PM > > To: [email protected] > > Subject: [videoblogging] Apple TV and iPod clash > > > > 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 > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links >
