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Showing results 1 to 14 of 14
Search took 0.00 seconds. Search: Posts Made By: pieter3d
Forum: VP9 and AV1 5th August 2015, 17:20
Replies: 39
Views: 128,754
Posted By pieter3d
For vp8 it is similar, look for the...

For vp8 it is similar, look for the refresh_golden_frame, refresh_alt_ref_frame and copy_buffer_to_arf syntax elements in the header.
Forum: VP9 and AV1 5th August 2015, 16:50
Replies: 39
Views: 128,754
Posted By pieter3d
For any given frame, the decoder cannot know how...

For any given frame, the decoder cannot know how it will be used in the future. However, it does know how the current frame should be handled in the reference pool of 8 buffers. In the current...
Forum: VP9 and AV1 24th July 2015, 16:15
Replies: 39
Views: 128,754
Posted By pieter3d
Again, the usage of alt-ref for hidden frames is...

Again, the usage of alt-ref for hidden frames is purely an encoder choice, one that the libvpx encoder happens to make. It is not enforced in any way by the VP9 specification. Any frame can be made...
Forum: VP9 and AV1 23rd July 2015, 16:35
Replies: 39
Views: 128,754
Posted By pieter3d
Alt-Ref,Golden and Last are just names, nothing...

Alt-Ref,Golden and Last are just names, nothing more. Think of it as an enumerated type on top of reference number 0, 1, 2.

Any frame can be marked as hidden (not for display). In the case of...
Forum: VP9 and AV1 2nd April 2014, 02:22
Replies: 39
Views: 128,754
Posted By pieter3d
Just wait until you start implementing the loop...

Just wait until you start implementing the loop filter
Forum: VP9 and AV1 2nd April 2014, 00:15
Replies: 39
Views: 128,754
Posted By pieter3d
Look at how it derives the use_hp bit when...

Look at how it derives the use_hp bit when reading the MV delta from the bitstream. It uses the predictor, which is derived from final MV values.
Forum: VP9 and AV1 22nd October 2013, 00:52
Replies: 39
Views: 128,754
Posted By pieter3d
Yes, when you are the encoder it is a terrific...

Yes, when you are the encoder it is a terrific feature. Also when you control the whole pipe (like if you are Netflix), then it is great too. But when you just need to decode any Main Profile clip,...
Forum: VP9 and AV1 21st October 2013, 19:14
Replies: 39
Views: 128,754
Posted By pieter3d
That's a pretty hard question to answer;...

That's a pretty hard question to answer; depending on modes HEVC & VP9 could be harder or easier than AVC. It also depends on how you measure complexity. Memory usage? Silicon area? CPU load?
For...
Forum: VP9 and AV1 21st October 2013, 00:41
Replies: 39
Views: 128,754
Posted By pieter3d
Well in HEVC WPP is optional, which means that...

Well in HEVC WPP is optional, which means that even if you create a really great multi threaded decoder, you still cannot guarantee performance since a stream might not have it enabled.

In VP9...
Forum: VP9 and AV1 18th October 2013, 18:09
Replies: 39
Views: 128,754
Posted By pieter3d
Yeah. Another glaring flaw is the fact that MV...

Yeah. Another glaring flaw is the fact that MV decode requires fully reconstructed neighboring and co-located MV values, which means the entire MV prediction process is required for entropy decode...
Forum: VP9 and AV1 18th October 2013, 01:58
Replies: 39
Views: 128,754
Posted By pieter3d
A note to implementers, VP9 contains a bug in the...

A note to implementers, VP9 contains a bug in the loop filter that must be matched. See: https://code.google.com/p/webm/issues/detail?id=642
Forum: VP9 and AV1 8th October 2013, 00:39
Replies: 39
Views: 128,754
Posted By pieter3d
Phew - hope that is all clear. Questions &...

Phew - hope that is all clear. Questions & comments welcome!
Forum: VP9 and AV1 8th October 2013, 00:38
Replies: 39
Views: 128,754
Posted By pieter3d
- Part2 - Inter prediction: Inter...

- Part2 -

Inter prediction:
Inter prediction in VP9 uses 1/8th pel motion compensation, twice the precision of most other standards. In most cases, motion compensation is unidirectional, meaning...
Forum: VP9 and AV1 8th October 2013, 00:34
Replies: 39
Views: 128,754
Posted By pieter3d
How VP9 works, technical details & diagrams

Hi all,

After my last post on HEVC (http://forum.doom9.org/showthread.php?t=167081) got some interest, I’ve decided to write one on VP9, Google’s new video coding standard. The bitstream was...
Showing results 1 to 14 of 14

 
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