Uri Lublin <u...@redhat.com> 于2021年2月2日周二 下午10:32写道：
> On 2/2/21 2:50 PM, lx wrote: > > > > > > Uri Lublin <u...@redhat.com <mailto:u...@redhat.com>> 于2021年1月31日周 > > 日 下午9:48写道： > > > > On 1/30/21 1:25 PM, lx wrote: > > > Frediano Ziglio <fredd...@gmail.com <mailto:fredd...@gmail.com>> > > 于2021年1月29日周五 下午6:39写道： > > > > > >> Il giorno gio 28 gen 2021 alle ore 01:45 lx > > <lxlenovos...@gmail.com <mailto:lxlenovos...@gmail.com>> ha > > >> scritto: > > >>> > > >>> > > >>> Uri Lublin <u...@redhat.com <mailto:u...@redhat.com>> 于2021年1 > > 月27日周三 下午11:47写道： > > >>>> > > >>>> On 1/27/21 4:22 AM, lx wrote: > > >>>>> Hi all: > > >>>>> If I redirect USB camera to virtual machine, I think > > we send > > >>>>> original URB to virtual machine by USB channel. > > >>>>> Is this understanding correct? If we want to improve the user > > >> experience, > > >>>>> we need to compress URB data? > > >>>> > > >>>> Hi, > > >>>> > > >>>> If you build with lz4 enabled (both client and server), > > >>>> then it should use lz4 to compress the data. > > >>>> > > >>>> There is no functionality to create > > >>>> a video stream out of raw data. > > >>>> > > >>>> Can the USB camera be configured to send a compress stream? > > >>>> > > >>>> Uri. > > >>>> > > >>> > > >>> Hi: > > >>> USB camera can support MJPG and YUV. I think H264 is > > better than > > >> MJPG. So Can we > > >>> let spice support H264 ? Is this feasible? > > >>> > > >> > > >> This is independent from SPICE, if the camera send compressed > data > > >> already SPICE will just > > >> forward compressed data in whatever format is in USB. > > >> If the camera supports MJPEG and YUV choose MJPEG, YUV is not > > >> compressed (just a different color > > >> space than RGB, often taking less bits but still not compressed). > > >> > > >> Frediano > > >> > > > > > > If the camera chooses YUV, can we encode it to H264 in SPICE? Is > this > > > feasible? > > > > Currently, SPICE does not do look at USB data. > > > > > > Hi: > > > > What do you mean spice just forward USB protocol data? > > SPICE does look at USB headers, configurations, etc. > > I meant that SPICE does not look at data that is > being transferred. So for example, it does > not know if the data coming from the camera is YUV, > RGB, MJPEG or other. > > To answer your question above more clearly: > Currently it's not possible to H264-encode the > YUV data coming from the camera. > It is feasible to add code that does it. > If possible, it's best if the camera sends an encoded video stream. > > Uri. > > Hi all: I know ICA/RDP is better than spice, when they redirect the USB camera devices. This is beacuse ICA/RDP encode video stream, so the effect is so good? Or how can we optimize spice to achieve their results? Thank you btw: I know ICA/RDP support few devices.
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