Bugzilla

In term of the performance, let decoding happens in GPU process would be most benefitial (no matter hw & sw) because it could help to reduce the need of copying video as much as possible (Chrome already did that) But your concern also makes sense, I don't know how gfx team think about the decoding crash would also affect the rendering. 

Jeff, I wonder what the thought from the gfx team's perspective is? Would gfx team want all video decoding happening in GPU? 

> Not sure why that line was added in the first place if the intention was never to do hardware decode there. 

The zero-copying thing was added recently, so I guess we still wanted to use RDD as a backup place for HW decoding at that time. But as what you mentioned in the comment0, this didn't happened.

> Should it be allowed as a backup without zero-copy? 

I think it won't hurt to enable HW decoding on RDD as a back up plan on Windows. 

> Make RDDParent::RecvInitVideoBridge reinitialize WMFDecoderModule, the same way RDDParent::RecvUpdateVar does.

This would result in many no-necessary initialization for `WMFDecoderModule` because RDD would need to build the video bridge for every content process which is playing video. If we do so, whenever a new content process starts playing video (we build a video bridge between them), we would initialize `WMFDecoderModule` again.

In term of the performance, let decoding happens in GPU process would be most benefitial (no matter hw & sw) because it could help to reduce the need of copying video as much as possible (Chrome already did that) But your concern also makes sense, I don't know how gfx team think about the decoding crash would also affect the rendering. 

Jeff, I wonder what the thought from the gfx team's perspective is? Would gfx team want all video decoding happening in GPU? 

> Not sure why that line was added in the first place if the intention was never to do hardware decode there. 

The zero-copying thing was added recently, so I guess we still wanted to use RDD as a backup place for HW decoding at that time. But as what you mentioned in the comment0, this didn't happened.

> Should it be allowed as a backup without zero-copy? 

I think it won't hurt to enable HW decoding on RDD as a back up plan on Windows.