[vlc-devel] [PATCH 01/11] decoder: use an object to create the decoder device

[Steve Lhomme]

On 2019-11-09 2:17, Rémi Denis-Courmont wrote:
> Le vendredi 8 novembre 2019, 16:12:42 EET Steve Lhomme a écrit :
>> On 2019-11-08 14:54, Rémi Denis-Courmont wrote:
>>> This works to create a device out of nothing, but presumably the goal is
>>> to create a device out of an encoder, not nothing. So this does in fact
>>> not work.
>>
>> No, the goal is to create an encoder out of a hardware device when
>> possible (unfortunately named "decoder device") and fall back to
>> software if it doesn't work.
> 
>  From an architectural point of view, both options are possible, and I don't
> personally mind either way. But people use the (sout-transcode-)venc option,
> and it will get nasty if we need two agreeing options to select the encoder.

This doesn't change anything for the encoder. What it will change is 
that the user can use --dec-dev and the encoder might use it if it can 
(for example the QSV with D3D11 I did). The encoder and decoder will use 
the same device for better performance (the same way we match the 
display device with the decoder one).

Maybe at some point we might want to have one GPU do the encoding and 
another GPU do the decoding. But that's probably for 5.0 and it will 
likely be an option for the encoder to tell it to use another decoder 
device.