вт, 29 апр. 2025 г., 00:54 Phyllis Smith <phylsmith2017@gmail.com>:

Checked into GIT a modified AVC_Intra_100.mp4 with a comment added at the beginning:

  # Modify the 100 in avcintra-class=100 to 200, 300 or 480 as needed.

and removed "level=4.1" since in my testing that was the default for avcintra-class=100. So users will not have to modify the level number when modifying the class number (200 is level 5 by default). 

That is the beauty of the render formats --users can easily change values.  BTW - it creates a huge file when you get to level 200 so I did not test 300 or 480.

yeah ... thanks for testing!

P.S. I forgot to test/checkin AVC_Intra_100.mov but will not forget to do so later.

On Fri, Apr 25, 2025 at 4:16 PM Andrew Randrianasulu <randrianasulu@gmail.com> wrote:

сб, 26 апр. 2025 г., 01:04 Phyllis Smith <phylsmith2017@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@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@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.