[vlc-devel] [PATCH] fps: clone the extra pictures we send

Steve Lhomme robux4 at ycbcr.xyz
Wed Oct 7 07:41:26 CEST 2020

On 2020-10-06 16:40, Rémi Denis-Courmont wrote:
> Le tiistaina 6. lokakuuta 2020, 15.08.35 EEST Steve Lhomme a écrit :
>> On 2020-10-06 13:53, Steve Lhomme wrote:
>>> The same picture is supposed to be filtered or rendered at a different
>>> date, but the source pixels should be the same. The content is not going
>>> to be changed in the pictures we output from this filter. Even blenders
>>> take care of this in their source picture to avoid modifying pictures
>>> used by the decoder as reference frames.
>> It means we can use the fps even for GPU sources.
> We can already do that. picture_Copy() calls picture_CopyPixels() which calls
> the context copy callback. There's effectively no differences between
> picture_Clone() and picture_Copy() for opaque pictures.

And this has already been pointed out in the past that this is wrong. A 
clone and a copy are not the same for CPU pictures. It must not be the 
same for GPU pictures.

And doing a copy here is also the wrong thing to do.

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