[x265] Tiles support for x265

[Mario *LigH* Rohkrämer]

Jamaica posted a picture describing the different modes pretty well:

http://forum.doom9.org/showthread.php?p=1780469#post1780469

I am especially glad to have an imagination of WPP now. And even if Main  
profile does not support tiles in conjunction with WPP, higher profiles  
may. But so far for a long-term outlook...


Am 12.09.2016, 22:24 Uhr, schrieb Tom Vaughan  
<tom.vaughan at multicorewareinc.com>:

> 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