On Mon, Mar 14, 2016 at 2:22 PM, Manuel Braga <mul.br...@gmail.com> wrote: > On Sun, 13 Mar 2016 18:00:17 -0400 "jonsm...@gmail.com" > <jonsm...@gmail.com> wrote: >> On Sun, Mar 13, 2016 at 5:16 PM, Manuel Braga <mul.br...@gmail.com> >> wrote: >> > On Sun, 13 Mar 2016 13:28:22 -0500 Rosimildo DaSilva >> > <rosimi...@gmail.com> 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.
I want ISPs with denoising capability. Back to back frames can have a lot of least significant bit jitter in them. The denoising detects this and suppresses a lot of it. If you don't do this all of that noise gets h.264 encoded and it can add 30-40% to the stream bandwidth with useless noise. > > 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 -- Jon Smirl jonsm...@gmail.com -- 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 linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
