On Mon, 28 Apr 2008 03:09:51 +0200 ramsesoriginal <[EMAIL PROTECTED]> babbled:
> I'm not an expert, so maybe this question is silly, but it just popped > to my mind: using mencod, couldn't you decode the video, store it in > decoded form and then you have onyl to copy it? If this would be > possible, you cold make some sort of video-transfere-applciation where > you can set the desidred speed/size/ratio.. > > again, i have no idea if it's possible, just 2 thoughts from my side.. yes. that's possible. of course your 100mb movie file becomes about 1-2gb now :) maybe more... in theory u should manage [EMAIL PROTECTED] (24fps is movie framerate in the cinemas). as u have almost no decode (though you have to read it from some IO souce). so u need an IO source that can stream 7mb/sec to you (good luck finding that!) but *IF* u did... a 2 hour movie would be about 46gb of data... good luck finding that storage too! :) in other words... "not practical to have it unencoded to avoid decoding". i used a 2hr movie just as an example so you know just how much video compression gets you... it saves an AMAZING amount of space. the numbers for pure video source (that is zero quality loss original RGB data) is double that for [EMAIL PROTECTED] (92gb)... in the end beyond a "hey my phone is so cool i play high-res video" demos of 30 second clips (that woul still be enormous and u wouldnt be able to store more than 1 or 2 anyway - but as a demo to show off its enough), it is just not useful or practical. yes - we can go for simpler compression schmes that still require decode, but just less effort and eerything just adjusts. we spend less decode time, but require more IO bandwidth and vice-versa. once decoded u have a tradeoff of resolution vs frames per second as the pipe u have to send it down is fixed in size. you choose your favorite tradeoff, but somewhere there you will need to make one. -- Carsten Haitzler (The Rasterman) <[EMAIL PROTECTED]> _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
