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HDR video book from 2008
by Andrew Randrianasulu 12 May '25

12 May '25

https://www.cl.cam.ac.uk/~rkm38/pdfs/myszkowski08hdrvideo.pdf explains a bit some experimental setups, contains references (bibliography) for earlier research. Yes, it much easier for me to spend days following those links instead of, you know, trying to fix actual code ...

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Color management .. in windows 11!
by Andrew Randrianasulu 12 May '25

12 May '25

https://devblogs.microsoft.com/directx/auto-color-management/ Interesting that only with Win11 users get some advanced options for SDR but potentially wide-gamut images, on std 8 bpc displays with ICC color management === quoting Microsoft ==== In particular, by default your ICC profile-based app is restricted to the sRGB gamut, even if the monitor is actually wider gamut. Windows also provides an ICC compatibility helper that can give your ICC app access to the display’s entire gamut. For more info, see the Display ICC profile compatibility helper <https://learn.microsoft.com/en-us/windows/win32/wcs/advanced-color-icc-prof…> section in this topic. {...} Display ICC profile compatibility helper When Advanced Color is active, Windows provides a compatibility helper for display ICC profiles that provides access to the display's entire gamut. In that way your app continues to get accurate and wide gamut colors up to the reported capability of the display—the same functionality that's available on calibrated wide gamut monitors in legacy non-Advanced Color mode today. Without that helper, your app will be limited to default behavior, which is sRGB (see ICC profile default behavior with Advanced Color <https://learn.microsoft.com/en-us/windows/win32/wcs/advanced-color-icc-prof…> ). That helper is available starting with Windows 11. It doesn't provide other benefits of Advanced Color including access to higher precision/bit-depth or high dynamic range—you'll need to modify your app to be Advanced Color-aware. ===== Also interesting that MS uses some gpu hardware for this task, not just shaders alone? At least this is how I interpret hw requirements .... AMD after RX400, but much more recent Intel and Pascal+ for Nvidia ....

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Wide-gamut test page for browsers
by Andrew Randrianasulu 12 May '25

12 May '25

https://www.wide-gamut.com/test My cheap tablet with Android 11 + firefox fails on both fronts. Interestingly, video embedded at first tab is just 8bit h264 according to mediainfo https://www.wide-gamut.com/assets/video-hdr/P3-BLUE-HDR-1000nits.mp4 Interesting to see that baaack in 2004 or 2005 when it was mostly research 8bit per component was considered ok for HDR video, but I guess further research disproved that early hope?

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HDR still image trick
by Andrew Randrianasulu 11 May '25

11 May '25

https://discourse.radiance-online.org/t/hdr-display-options/1081/2 ==== [...] Various researchers have built their own systems by combining a DLP projector with an LCD display with it's backlight "hinged" out of the way, a la the original paper by Seetzen et al: Seetzen, Helge, W. Heidrich, W. Stuezlinger, G. Ward, L. Whitehead, M. Trentacoste, A. Ghosh, A. Vorozcovs, "High Dynamic Range Display Systems," ACM Trans. Graph. (special issue SIGGRAPH 2004), August 2004. For my own use, I still have the HDR viewer I made over a decade ago: Ward, Greg, "A Wide Field, High Dynamic Range, Stereographic Viewer," Proceedings of PICS 2002, April 2002. By far the easiest (and cheapest) solution for still images is to print out a grayscale version of the square root of your image (with maximum normalized to 1.0) as described in the above paper, but as a large-format print. I would make this one the image with exaggerated contrast, since you can print it at high-resolution. Then, project the original image divided by this grayscale image using a standard DLP or LCD projector -- preferably a bright one although it doesn't need to be high-resolution, onto this print. Line it up, and violá! You have a high-resolution, high dynamic range still image. There's no way to make it move, sadly. -Greg ===== quote ends here ====

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zscale's tonemapping on input
by Andrew Randrianasulu 11 May '25

11 May '25

Using this page https://www.reddit.com/r/ffmpeg/comments/17ma3mm/hdr_tone_mapping_not_worki… and our guide at https://cinelerra-gg.org/download/CinelerraGG_Manual/File_naming_convention… I come up with this (working) line to put in file.opts for HDR to SDR bt 709 100 nits mapping: video_filter=zscale=t=linear:npl=100,format=gbrpf32le,zscale=p=bt709,tonemap=tonemap=hable:desat=0,zscale=t=bt709:m=bt709:r=tv,format=yuv444p But it only works with software decoding. At, like, 2.3 fps for full 4k frame. And also you need to compile your ffmpeg used in cingg with z.img library.

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Smaller HEVC HDR test file
by Andrew Randrianasulu 10 May '25

10 May '25

https://cloud.mail.ru/public/pgQ6/g4XNRF3ye I created smaller 18 mbytes test file (actually 480p) for testing, like this ~/bin//ffmpeg8-vk -i ~/K38_sdcard1/Documents/iPhone11_4K-recorder_59.940HDR10.mov -vf scale=-2:480 -c:a copy -c:s copy -c:v libx265 -t 25 -g 5 -crf 20 -f mp4 /dev/shm/hevc_720p.mp4 If you look at it WITHOUT tonemapping it will look very washed out. If you add tonemapping it will look much more lively (all on SDR display of course)

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Dynamic_input filters and avfilter_pad_get_type
by Andrew Randrianasulu 09 May '25

09 May '25

I was looking at why our application (cinelerra-gg) crashed at trying to use libplacebo I found that libplacebo defines itself https://ffmpeg.org/doxygen/7.0/vf__libplacebo_8c.html as .flags = AVFILTER_FLAG_HWDEVICE <https://ffmpeg.org/doxygen/7.0/group__lavfi.html#ga01e3b7175b4477235061256f…> | AVFILTER_FLAG_DYNAMIC_INPUTS <https://ffmpeg.org/doxygen/7.0/group__lavfi.html#gae6ed6c10a03508829bdf1756…> , so only output pad is defined, as far as I can see: static const AVFilterPad <https://ffmpeg.org/doxygen/7.0/structAVFilterPad.html> libplacebo_outputs <https://ffmpeg.org/doxygen/7.0/vf__libplacebo_8c.html#a3545e8f08cc238430300…>[] = { { .name <https://ffmpeg.org/doxygen/7.0/structAVFilterPad.html#afc112061a6035639934e…> = "default", .type = AVMEDIA_TYPE_VIDEO <https://ffmpeg.org/doxygen/7.0/group__lavu__misc.html#gga9a84bba4713dfced21…> , .config_props = &libplacebo_config_output <https://ffmpeg.org/doxygen/7.0/vf__libplacebo_8c.html#a09a97380118a876bb5fc…> , }, }; then when our code calls avfilter_pad_get_type() it promptly crashes. BC_Signals::dump_stack cin() [0x8b2c9e2] linux-gate.so.1(__kernel_rt_sigreturn+0) [0xf7fb8590] cin(avfilter_pad_get_type+0x14) [0x99266a4] cin(_ZN13FFVideoStream13create_filterEPKc+0xbc) [0x865669c] cin(_ZN6FFMPEG12open_decoderEv+0x80f) [0x865732f] cin(_ZN10FileFFMPEG9check_sigEP5Asset+0x81) [0x8670071] cin(_ZN4File5probeEv+0x376) [0x867cd86] cin(_ZN4File9open_fileEP11PreferencesP5Assetii+0x378) [0x867d628] cin(_ZN7MWindow14load_filenamesEP9ArrayListIPcEiii+0x250) [0x87301f0] cin(_ZN17CommandLineThread3runEv+0x53) [0x86e2cd3] cin(_ZN6Thread10entrypointEPv+0x41) [0x8b70c11] /lib/libpthread.so.0(+0x7328) [0xf7df9328] /lib/libc.so.6(clone+0x66) [0xf0373f06] We still hope to get libplacebo's tonemapping + vulkan hevc decoding going, so any pointers how to talk to those dynamic_input filters will be useful. Even swscale is dynamic_input in ffmpeg 7.1+, so I (we) really hope to keep it working, too. Code: https://git.cinelerra-gg.org/git/?p=goodguy/cinelerra.git;a=blob;f=cinelerr…

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add Vulkan hwaccel
by Andrew Randrianasulu 09 May '25

09 May '25

Now non-tonemapped 4k h264 hit 56 fps in window :)

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hw filtering examples?
by Andrew Randrianasulu 08 May '25

08 May '25

I am trying to find out why our (cinelerra-gg) ffmpeg integration refuses to load filtergraph < and crashes and burns! > if I set hw decoding to any value (it works for sw decoding). So far I found this example (not accepted) on ffmpeg-devel, but I am still not sure how to apply ot for our case (we use av_buffersink_get_frame() ) https://ffmpeg.org/pipermail/ffmpeg-devel/2018-August/233555.html In general, I hope to get hw decoding (now via vulkan ) + libplacebo doing tonemapping purely on GPU *before* frames ingested into cingg for further (mostly software/host) manipulation, display and encode. But I guess for this I need to pass around hw_device_context created for decoder for this media/input file? (our filtering options are either global or per-file) filter_graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx); Paul, your lavfi-preview does not have hw filters previews yet, or I read sources too diagonally?

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I tried to add AVC-Intra 100 output profiles
by Andrew Randrianasulu 08 May '25

08 May '25

But not sure if I did this correctly. https://en.wikipedia.org/wiki/AVC-Intra says for AVC-Intra 100: AVC-Intra 100: nominally 100 Mbit/s, size of each frame is fixed CAVLC entropy coding only. All formats are High 4:2:2 Intra Profile, Level 4.1 4:2:2 chrominance sampling frames are not scaled and yeah, this French-language pdf actually says the same: https://web.archive.org/web/20110720215759/http://www.ficam.fr/upload/docum… 50M 100M Standard MPEG-4 part10 AVC/H.264 Profile High 10 Intra High 4:2:2 Intra Level Level 3.2/4.0 Level 4.1 Resolution 1440x1080 / 960x720 1920x1080 / 1280x720 Sampling 4:2:0 4:2:2 Bit rate 54Mbps 111Mbps Block size Y: 8x8, C: 4x4 Intra Prediction Y: 9mode, C: 4mode MBAFF Yes De-block filter No Slice/frame 10 Entropy coding CABAC CAVLC so, I looked up ffmpeg cmd line https://trac.ffmpeg.org/ticket/3597 ffmpeg -v info -i /mnt-data/backup4/vol0/export/CUHK\ 2014-1/V017b.mov -vcodec libx264 -intra -pix_fmt yuv422p10le -vb 100M -x264opts avcintra-class=100 -x264opts colorprim=bt709 -x264opts transfer=bt709 -x264opts colormatrix=bt709 -threads 4 -acodec copy V017b-ffmpeg-git-avcintra100.mov Huh, said I and entered those params in opts file, actually in two files (mp4 and mov containers) mov libx264 cin_pix_fmt=yuv422p10le flags -global_header keyint_min=0 x264-params=keyint=0:colorprim=bt709:transfer=bt709:colormatrix=bt709 avcintra-class=100 bufsize=100000000 level=4.1 mp4 libx264 cin_pix_fmt=yuv422p10le flags -global_header keyint_min=0 x264-params=keyint=0:colorprim=bt709:transfer=bt709:colormatrix=bt709 avcintra-class=100 bufsize=100000000 level=4.1 both for progressive content, for interlace you must add some more flags: https://lists.ffmpeg.org/pipermail/ffmpeg-user/2017-January/035049.html -flags +ildct+ilme -x264opts interlaced=1 Also, there is still lack of (GUI) user notification if file writing failed due to NO SPACE on device :} FFStream::write_packet: write packet failed. file:/dev/shm/avci_new.mp4 err: На устройстве не осталось свободного места FFStream::encode_frame: encode failed. file: /dev/shm/avci_new.mp4 err: На устройстве не осталось свободного места FFStream::flush failed :file:/dev/shm/avci_new.mp4 err: Операция не позволена Render::render_single: Session finished. ** rendered 273 frames in 85.585 secs, 3.190 fps Render::render_single: Session finished. ** rendered 273 frames in 85.485 secs, 3.194 fps Render::render_single: Session finished. ** rendered 273 frames in 82.176 secs, 3.322 fps Profile sort of assumes you set project to some supported resolution, framerate, etc, otherwise libx264 will fail with console error message..... I found some talk about AVC-Ultra, there even was patch for x264, but it was not merged: https://mailman.videolan.org/pipermail/x264-devel/2015-September/011412.html Also, I think sound must be uncompressed, but I'm not sure.

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