[Cin] xavc-intra class 480

[Andrew Randrianasulu]

сб, 26 апр. 2025 г., 01:04 Phyllis Smith <phylsmith2017 at gmail.com>:

> Andrew, should these be checked into GIT source as is?  I was waiting to
> see if any followup on your 2 question commentaries.
>

Honestly I am mot sure, difference is small, may be we can collapse all
200/300/480 lines as comments in already existing avcintra100 profile?

>
> On Mon, Apr 21, 2025 at 4:33 PM Andrew Randrianasulu <
> randrianasulu at gmail.com> wrote:
>
>> I tried to add other xavc classes as mp4 profiles (see attached patch, do
>> not forgot to make install after patching), but without altering bt709 x264
>> params line - may be we should comment it so it can be overridden by bt2020
>> colorimetry?
>>
>> also, those does not set flavor sony, may be they should?
>>
>> I also try to develop xavc mxf profiles on desktop (those are from
>> Termux, 3 fps encode at FHD ;)
>>
>> вт, 22 апр. 2025 г., 00:54 Andrew Randrianasulu <randrianasulu at gmail.com
>> >:
>>
>>> In attempt at speeding up hdr10 4k HEVC video playback I tried to
>>> re-encode it into AVC-intra using this guide:
>>>
>>>
>>> https://www.voukoder.org/forum/thread/1163-replicate-sony-s-xavc-i-s-format/
>>>
>>> basically either
>>>
>>> ffmpeg -i input -c:v libx264 -avcintra-class 480 -pix_fmt yuv422p10le
>>> -preset ultrafast -x264opts avcintra-flavor=sony -c:a pcm_s24le -ar
>>> 48k output.mxf
>>>
>>> or for half size
>>>
>>>  ffmpeg -i ~/K38_sdcard1/Documents/iPhone11_4K-recorder_59.940HDR10.mov
>>> -s 1920x1080 -c:v libx264 -avcintra-class 200 -pix_fmt yuv422p10le
>>> -preset ultrafast -x264opts avcintra-flavor=sony -c:a pcm_s24le -ar
>>> 48k output-half.mxf
>>>
>>> Note, line errors out when I tried class 480 for 1920x1080 frame size
>>>
>>> Both files load into cingg
>>>
>>> Original file (4k hdr hevc, 59.94 fps) plays at around 22 fps at
>>> output x11, project rgba-float. But seeking is sad. Not to mention
>>> lack of tonemapping.
>>>
>>> First 4k avc-intra 4k reencode plays at around 33 fps and seeks much
>>> better (no artefacts)
>>>
>>> 1920x1080 proxy plays at 60 fps, and if I check play every frame and
>>> try 2x speed forward - at 83 Fps.
>>>
>>> But trying two FullHD tracks referencing same "proxy" file set to
>>> different fade leves with project set to RGBA-float kills fps back to
>>> 2-3 :)
>>>
>>> Encoding at ultrafast preset was 4.5 fps for 4k version and 12 fps for
>>> FullHD version.
>>>
>>> Filesizes:
>>>
>>> du -h *.mxf
>>> 1.0G    output-half.mxf
>>> 2.2G    output.mxf
>>>
>>> this is just for
>>> frame= 1149
>>> time=00:00:19.15
>>>
>>> Well, I guess without some serious GPU upgrade  this machine not gonna
>>> play HDR 4k :)
>>>
>>> Regular 8 bit/SDR 4k somewhat plays in firefox (if file just av1, 24
>>> fps), at least on Linux where I can set GPU frequency a bit higher
>>> than default on nouveau/libre drivers.
>>>
>>
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