[x265] Tiles support for x265

[Tom Vaughan]

Sorry for the short reply.  We're at the IBC Show, and it's keeping us on
the run from morning until late at night.  I at least wanted to respond to
the question.

Yes, we're working to implement full support for multiple slices per frame,
and this will be followed by support for tiles.  Things like rate control
have to be readjusted and tuned, and other algorithms may need to be
adjusted, so it may take a number of weeks to fully implement and optimize.

Multiple slices per frame is not recommend for most encoding applications.
As you cannot perform inter-prediction across slice boundaries (from frame
to frame), encoding efficiency is reduced.  Multiple slices is mainly
beneficial for low-latency live encoding applications.

Your description of slices and tiles below is basically accurate.

Tom

-----Original Message-----
From: x265-devel [mailto:x265-devel-bounces at videolan.org] On Behalf Of Mario
*LigH* Rohkrämer
Sent: Monday, September 12, 2016 8:54 AM
To: Development for x265
Subject: Re: [x265] Tiles support for x265

Shortest possible reply... :-P


I *guess* the recently introduced implementation of several slices is
already a step towards this even narrower approach.

IIRC, slices already existed in previous video standards (like MPEG 1/2
Video) but were mainly meant to span across the whole width, or at least a
horizontal sequence of consecutove macroblocks in encoding order. Tiles are
specifically designed to split the frame into a grid of rectangular parts,
like a "video wall" is made of a grid of monitors.

Did I imagine correctly so far? ... It might be suitable to explain this
concept a bit in a kind of "outlook" post in a video forum, maybe even in
comparison with WPP (dis- vs. advantages).


Am 10.09.2016, 21:16 Uhr, schrieb Tom Vaughan
<tom.vaughan at multicorewareinc.com>:

> Yes.
>
>
>
> *From:* x265-devel [mailto:x265-devel-bounces at videolan.org] *On Behalf
> Of * pleaselou at gmx.net
> *Sent:* Saturday, September 10, 2016 2:08 PM
> *To:* x265-devel at videolan.org
> *Subject:* [x265] Tiles support for x265
>
>
>
> Hi!
>
>
>
> I just browsed the online docs
> (http://x265.readthedocs.io/en/default/)
> for
> information on how to encode a video using HEVC tiles and couldn't
> find anything. Are there any plans to implement this feature in the x265
> lib?
>
>
>
> I have to encode a video given a specific tiling pattern and doesn't
> want to use HM encoder cause it's pretty slow.
>
>
>
> Best, Mario


-- 

Fun and success!
Mario *LigH* Rohkrämer
mailto:contact at ligh.de

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