April 2025 - Cin - Cinelerra-GG Mailing Lists

I tried to make sws_scale go multithread ..
by Andrew Randrianasulu 28 Apr '25

28 Apr '25

BUT FAILED. in sense my mod apparently just leaks (swsContext?) so it can't play even 20 sec of 1440*1080 video to completion in termux, running on tablet with 3Gb ram. There seems to be difference if I set thread count manually (on file reading only for now) but it looks negative, in other words higher thread count -> slower total playback .. tried 8, 4,1,16 on 8 cpu tablet. Speed was going down from 18 fps for unaltered cingg to 13 with 8 threads and crash/oom with 16 ;) And if I try to use sws_scale_frame I just got all blank/black frames on timeline .... I think switching to sws_scale_frame is important if we want to try new colormanagement support in ffmpeg.git ... Resources used, apart from that Blender diff: https://github.com/mltframework/mlt/blob/master/src/modules/avformat/filter…

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threaded swscale in blender
by Andrew Randrianasulu 27 Apr '25

27 Apr '25

Interesting diff, may be cingg can use something like this for speeding up swscale conversions? https://projects.blender.org/blender/blender/pulls/116309/commits/4647c80f5… But it seems that only upcoming ffmpeg version will allow to set transfer characteristics directly on avframe during scaling. So may be until this day our colorspace plugin should grow some knowledge about various gamma systems and also white points?

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Can sws_scale() set trc?
by Andrew Randrianasulu 27 Apr '25

27 Apr '25

Or we need to go and set in->color_trc out->color_trc on avframes directly, like libavfilter/vf_scale.c does ?

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libavutil/csp.h reading
by Andrew Randrianasulu 27 Apr '25

27 Apr '25

=== /** * Returns the ITU EOTF corresponding to a given TRC. This converts from the * signal level [0,1] to the raw output display luminance in nits (cd/m^2). * This is done per channel in RGB space, except for AVCOL_TRC_SMPTE428, which * assumes CIE XYZ in- and output. * * @return A pointer to the function implementing the given TRC, or NULL if no * such function is defined. * * @note In general, the resulting function is defined (wherever possible) for * out-of-range values, even though these values do not have a physical * meaning on the given display. Users should clamp inputs (or outputs) * if this behavior is not desired. * * This is also the case for functions like PQ, which are defined over an * absolute signal range independent of the target display capabilities. */ av_csp_eotf_function av_csp_itu_eotf(enum AVColorTransferCharacteristic trc); I guess this can be used for potential HDR waveform scope display?

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Ah, no vaapi-vulkan interop on gfx8!
by Andrew Randrianasulu 26 Apr '25

26 Apr '25

Feature request: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11074 https://gitlab.freedesktop.org/mesa/mesa/-/issues/5882 found via this post on reddit: https://www.reddit.com/r/jellyfin/comments/y7zns9/vulkan_filtering_on_amd_v… ==== However, there are still some limitations from upstream. First of all, the essential Vulkan extension *VK_EXT_image_drm_format_modifier* is currently *only available on Vega and newer cards/gfx9+*, which means that Polaris and older <https://gitlab.freedesktop.org/mesa/mesa/-/issues/5882> users will need to wait until upstream to complete the extension before they can get support for this. In addition, DRM changes are involved, so the Linux *kernel requires 5.15+*. ====

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I wonder
by Haldun ALTAN 26 Apr '25

26 Apr '25

Hello, It's been a quite a while that I receive only the mails from Sam via Cin. Somethings wrong or this is the new normal ? :) Greetings and thanks for your work you all :) Haldun.

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cingg faster than ffmpeg itself on pulling frames!?
by Andrew Randrianasulu 26 Apr '25

26 Apr '25

I tried to bench simple ffmpeg command (ffmpeg 7.1.1): time -p ./ffmpeg -hwaccel vaapi -i ~/K38_sdcard1/Documents/iPhone11_4K-recorder_59.940HDR10.mov -c:a copy -c:v rawvideo -f nut /dev/null this benches for 4k 60 fps HDR video at frame= 1148 fps= 10 q=-0.0 Lsize=27900063KiB time=00:00:19.16 bitrate=11927607.4kbits/s speed=0.173x real 111.77 user 42.61 sys 119.01 10 fps,150% cpu load. ffmpeg 4.4 was using just 85% cpu but only managed frame= 1148 fps=8.5 q=-0.0 Lsize=27900063kB time=00:00:19.15 bitrate=11933560.4kbits/s speed=0.142x 8.5 fps. But I am fairly sure I saw *15* fps in cingg on same file , if you set "play every frame" and vo driver to x11. Anyone want to repeat this experiment? Is it artefact of running 32bit program on top of 64bit kernel? At some point I might try latest Fedora 42 to see if full 64bit Linux will pull more frames out of same gpu decoder on same motherboard

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Techblog on HDR from Netflix perspective (2018)
by Andrew Randrianasulu 26 Apr '25

26 Apr '25

https://netflixtechblog.com/enhancing-the-netflix-ui-experience-with-hdr-1e… referenced in https://www.collabora.com/news-and-blog/news-and-events/breakthroughs-open-… technically, cinelerra does have pop up menu in fullscreen (compositor/viewer) mode, but I guess caring about it being correctly blended into HDR image is one of our least worries .....

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HW Accel
by Andrea paz 26 Apr '25

26 Apr '25

A few silly questions on topics already addressed several times. I was reading about hardware acceleration in ffmpeg. In my system ffmpeg I have: $ ffmpeg -hwaccels ffmpeg version n7.1 Copyright (c) 2000-2024 the FFmpeg developers built with gcc 14.2.1 (GCC) 20250207 configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libdvdnav --enable-libdvdread --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.100 / 61. 19.100 libavformat 61. 7.100 / 61. 7.100 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 4.100 / 10. 4.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 Hardware acceleration methods: vdpau cuda vaapi qsv drm opencl vulkan If I try the same command with ffmpeg contained in .../thirdparty/ffmpeg-7.0 I get: ./ffmpeg -hwaccels Hardware acceleration methods: vdpau cuda vaapi vulkan So I guess OpenCL; Qsv and drm can only be obtained by manually compiling them. With what exact options in ./configure? (I never know when to use “--with-” and when to use “--enable-”). “drm” can serve in CinGG? Another thing: vulkan is already included in CinGG, but I have never been able to activate the device and get it working. How to do that? With system ffmpeg I can activate it without any problems. I am attaching the part of ffmpeg's documentation regarding hardware acceleration. The following part (regarding decoding) seems important to me: "Note that most acceleration methods are intended for playback and will not be faster than software decoding on modern CPUs. Additionally, ffmpeg will usually need to copy the decoded frames from the GPU memory into the system memory, resulting in further performance loss. This option is thus mainly useful for testing." As usual, I thought it would be a good thing to have playback in hardware but it is not. (However, there is a video of Adam where he manages to get better decoding with his Nvidia: https://www.youtube.com/watch?v=IZdJqrObnik)

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HDR10 on radeonsi/EGL
by Andrew Randrianasulu 26 Apr '25

26 Apr '25

interesting bug report I found. https://gitlab.freedesktop.org/mesa/mesa/-/issues/12669 "radeonsi: Cannot deliver HDR10 0.0-125.0 values to 16 bit float GBM surface, only 0.0-1.0 seems to work. " So, it sort of force-normalized at least in egl ?

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