On Sun, 13 Mar 2016 18:00:17 -0400 "[email protected]" <[email protected]> wrote: > On Sun, Mar 13, 2016 at 5:16 PM, Manuel Braga <[email protected]> > wrote: > > On Sun, 13 Mar 2016 13:28:22 -0500 Rosimildo DaSilva > > <[email protected]> wrote: > >> > >> If we implement some Cedrus that works with relatively new H3/A64 > > > > The encoding side, you mean. > > That is easy, just what is need is for someone to do the need work. > > There isn't any technical difficulty, only is need time to do it. > > Please help us(the cedrus people), so that we can arrange the time > > to do it. > > We abandoned the Allwinner encoder hardware after discovering the > limitations of the hardware. The Allwinner encoder hardware is a > medium quality encoder that is not capable of making highly compressed > streams. But having said that, it is fine for use on a LAN, it just > isn't much good if you want to send a quality stream to a cell phone. > Another issue is that most of the Allwinner SOC don't have an ISP > (image signal processor) unit (some do, but most don't).
Right, this is one thing that most be made aware about this video engine, to avoid be disappointed about the expected quality. The h264 encoder can only do baseline profile (from what was found) When setting low QP values, there are a point in which the bitstream size stop decreasing, instead size get bigger, and with even lower values the images get trashed beyond recognition. And this is a hardware limitation. About ISP, well it depends what one whats to do. To encode in this video engine, the raw frames are feed to a called isp subengine, which acts as a source for the subengine that does the encoding. This "isp subengine" can do cropping, scaling, and take as source some different formats, no much else. And as you said, there is also in some socs a hardware block that functions as an ISP, but i know nothing about it. -- Manuel Braga -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
