[Spice-devel] Is the data after USB camera redirection compressed?

[Uri Lublin]

On 1/30/21 1:25 PM, lx wrote:
> Frediano Ziglio <freddy77 at 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 <lxlenovostar at gmail.com> ha
>> scritto:
>>>
>>>
>>> Uri Lublin <uril at 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.