[x265] x265-devel Digest, Vol 69, Issue 1
nalla shanaha
shananalla88 at gmail.com
Wed Feb 13 11:52:29 CET 2019
Sorry for the late reply.
The command line was :
ffmpeg -i input.mkv -c:v hevc -crf 28 -preset:v faster -an output.mkv
The reason for using 'faster' was to reduce the encode time. I have
seen a similar relationaship (--hevc-aq producing smaller encodes than
--no-hevc-aq) with both the 'medium' and 'fast' presets.
There seems to have been an improvement in the latest git as fast as
quality in --hevc-aq in concerned. Unfortunately, this is more of a
subjective thing, since SSIM does not really correlate perfectly with
perceived visual quality for me.
btw, in the links I supplied, both the git and release versions have
changed (to 3.0 for release), so you will have to use x265 2.8 from
elsewhere now.
thanks
On 2/4/19, x265-devel-request at videolan.org
<x265-devel-request at videolan.org> wrote:
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> Today's Topics:
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> 1. Re: information about --hevc-aq follow up (Kalyan Goswami)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 4 Feb 2019 15:34:41 +0530
> From: Kalyan Goswami <kalyan at multicorewareinc.com>
> To: Development for x265 <x265-devel at videolan.org>
> Subject: Re: [x265] information about --hevc-aq follow up
> Message-ID:
> <CAKmKOQRF3q9oxcs9P8LYxKsm5=OZsjrJ3-oi64=CrNrKX7GEPA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi,
>
> We are looking into this problem. Would you please share the exact CLI
> options that you have used for this test?
>
> Thanks,
> Kalyan Goswami, PhD
> Video Architect @ MulticoreWare
> http: <http://www.multicorewareinc.com/>//www.multicorewareinc.com
> <http://www.multicorewareinc.com/>
> +91 9884989331
>
>
> On Sun, Jan 27, 2019 at 8:11 PM nalla shanaha <shananalla88 at gmail.com>
> wrote:
>
>> Following on from the previous email, here are results of some testing.
>>
>> The files are 1080p videos from youtube
>>
>> 1) mortal engines movie trailer (youtube.com/watch?v=IRsFc2gguEg)
>> 2) polar movie trailer (youtube.com/watch?v=oMHwRal-AR8)
>> 3) solo movie trailer (youtube.com/watch?v=XRRNxIZfjHA)
>>
>> All ratio are normalized taking x265 2.8+74-fd517ae68f93 as base
>> x265 3.0 is version 3.0_RC+10-42b51d791a34
>>
>> x265 2.8 is from
>>
>> https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz
>> x265
>> <https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xzx265>
>> 3.0 is from
>> https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-amd64-static.tar.xz
>>
>> all videos were encoded with 1.77 aspect ratio, i.e 424x240,
>> 640x360,854x480 from the 1080p source videos
>>
>> --preset faster --crf 28 was used in all cases.
>>
>>
>>
>> +----------+------------------------------------------------------------------+
>> | file | bit rate ratios (x265 2.8 is 1x)
>> |
>>
>> +----------+------------------------------------------------------------------+
>> | 1)Polar |
>> +--------------+--------------+------------+-------------------+ |
>> | | | video height | --no-hevc-aq | --hevc-aq | percent
>> reduction | |
>> | |
>> +--------------+--------------+------------+-------------------+ |
>> | | | 240 | 1.231 | 0.725 | 41.1
>> | |
>> | | | 360 | 1.115 | 0.649 | 41.8
>> | |
>> | | | 480 | 1.104 | 0.679 | 38.5
>> | |
>> | |
>> +--------------+--------------+------------+-------------------+ |
>> | 2)Mortal |
>> +--------------+--------------+------------+-------------------+ |
>> | | | video height | --no-hevc-aq | --hevc-aq | percent
>> reduction | |
>> | |
>> +--------------+--------------+------------+-------------------+ |
>> | | | 240 | 1.164 | 0.633 | 45.6
>> | |
>> | | | 360 | 1.149 | 0.681 | 40.7
>> | |
>> | | | 480 | 1.079 | 0.668 | 38.1
>> | |
>> | |
>> +--------------+--------------+------------+-------------------+ |
>> | 3)Solo |
>> +--------------+--------------+------------+-------------------+ |
>> | | | video height | --no-hevc-aq | --hevc-aq | percent
>> reduction | |
>> | |
>> +--------------+--------------+------------+-------------------+ |
>> | | | 240 | 1.088 | 0.711 | 34.7
>> | |
>> | | | 360 | 1.046 | 0.741 | 29.1
>> | |
>> | | | 480 | 0.995 | 0.739 | 25.8
>> | |
>> | |
>> +--------------+--------------+------------+-------------------+ |
>>
>> +----------+------------------------------------------------------------------+
>>
>>
>> +----------+----------------------------------------------+
>> | file | speed ratios (x265 2.8 is 1x) |
>> +----------+----------------------------------------------+
>> | 1)Polar | +--------------+--------------+------------+ |
>> | | | video height | --no-hevc-aq | --hevc-aq | |
>> | | +--------------+--------------+------------+ |
>> | | | 240 | 0.936 | 0.147 | |
>> | | | 360 | 0.998 | 1.035 | |
>> | | | 480 | 1.013 | 1.055 | |
>> | | +--------------+--------------+------------+ |
>> | 2)Mortal | +--------------+--------------+------------+ |
>> | | | video height | --no-hevc-aq | --hevc-aq | |
>> | | +--------------+--------------+------------+ |
>> | | | 240 | 0.917 | 1.008 | |
>> | | | 360 | 0.966 | 1.077 | |
>> | | | 480 | 0.969 | 1.037 | |
>> | | +--------------+--------------+------------+ |
>> | 3)Solo | +--------------+--------------+------------+ |
>> | | | video height | --no-hevc-aq | --hevc-aq | |
>> | | +--------------+--------------+------------+ |
>> | | | 240 | 0.944 | 0.998 | |
>> | | | 360 | 1.017 | 1.044 | |
>> | | | 480 | 0.989 | 1.033 | |
>> | | +--------------+--------------+------------+ |
>> +----------+----------------------------------------------+
>> _______________________________________________
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