May 2026 - Cin - Cinelerra-GG Mailing Lists

alpha-hevc decoding workaround from ffmpeg.git
by Andrew Randrianasulu 09 May '26

09 May '26

https://source.ffmpeg.org/gitweb/ffmpeg.git/commit/eedf8f0165fe6523be692c5a… I saved this patch and applied to our ffmpeg. Now ffmpeg itself correctly decodes puppets_with_alpha_hevc.mov file from test project at https://developer.apple.com/documentation/avfoundation/using-hevc-video-wit… thirdparty/ffmpeg-8.1/ffmpeg -i /dev/shm/HEVC-Videos-With-Alpha-Exports/Resources/puppets_with_alpha_hevc.mov -vframes 1 1.png but in cinelerra-gg I still have fully-black background (prores sample from same project works ok)

1 0

Patch: also accept 'q' in tipwindow as close event
by Andrew Randrianasulu 08 May '26

08 May '26

just for consistency - I have tipwindow set to 1 in my 64-bit chroot, so I often q-q all windows by automatic muscle memory

2 2

lcms2 usage
by Andrew Randrianasulu 06 May '26

06 May '26

https://stackoverflow.com/questions/22561176/lcms2-convert-cmyk-to-rgb-thro… this was answered like this === copy === hTransform = cmsCreateTransform(hInProfile, TYPE_CMYK_8, hOutProfile, TYPE_ARGB_8, // ARGB is most likely for QImage INTENT_PERCEPTUAL, 0); uchar *in = outImage->bits(); // bits() is equivalent to scanLine(0) uchar *out = outImage->bits(); cmsDoTransform(hTransform, in, out, outImage->byteCount() / sizeof(QRgb)); === official article show bigger switch https://littlecms.com/blog/2020/12/09/using-lcms2-on-qt/ /** * Convert from Qt format to lcms2 format */ static cmsUInt32Number toLcmsFormat(QImage::Format fmt) { switch (fmt) { case QImage::Format_ARGB32: // (0xAARRGGBB) case QImage::Format_RGB32: // (0xffRRGGBB) return TYPE_BGRA_8; case QImage::Format_RGB888: return TYPE_RGB_8; // 24-bit RGB format (8-8-8). case QImage::Format_RGBX8888: case QImage::Format_RGBA8888: return TYPE_RGBA_8; case QImage::Format_Grayscale8: return TYPE_GRAY_8; case QImage::Format_Grayscale16: return TYPE_GRAY_16; case QImage::Format_RGBA64: case QImage::Format_RGBX64: return TYPE_RGBA_16; case QImage::Format_BGR888: return TYPE_BGR_8; default: return 0; } } so I think we can add support for rgb8 timeline format at least, in same place where swscale call done in our ffmpeg.C in ffmpeg we have libavfilter/vf_iccdetect.c #include <lcms2.h> const AVFrameSideData *sd; cmsHPROFILE profile; sd = av_frame_get_side_data(frame, AV_FRAME_DATA_ICC_PROFILE); profile = cmsOpenProfileFromMemTHR(s->icc.ctx, sd->data, sd->size); cmsCloseProfile(profile); Full documentation in pdf form https://www.littlecms.com/LittleCMS2.18%20tutorial.pdf TYPE_RGB_FLT/TYPE_RGBA_FLT exist in /usr/include/lcms2.h so rgba-float should be supportable too. I'll try to write easy detect part for configure first.

3 25

Not merged yet ffmpeg filters
by Andrew Randrianasulu 06 May '26

06 May '26

I was looking for opencl lut3d filter (i think mpv uses lcms2 + opengl to drive its color-managed output) And there was patch, since last year, but it not yet merged https://ffmpeg.org/pipermail/ffmpeg-devel/2025-June/346001.html also there was inverse tonemapping (SDR to HDR) filter, slo not merged yet https://ffmpeg.org/pipermail/ffmpeg-devel/2025-July/346244.html but I think patch was incomplete? It modifies file that does not exist yet (may be it used normal tonmapping filter sources as renamed base and then added on that?)

1 2

Colors questions
by Andrea paz 05 May '26

05 May '26

Two questions about colors: 1- Regardless of the color space used for the sources, and regardless of the operations we perform on the timeline, do we always see only an sRGB signal on the monitor? Even if the monitor is set to a different color space? I mentioned this in the manual where I had gathered various comments from GG and others, but I can no longer find the sources. Can we see from the code how the signal sent to the monitor works? 2- In the rendering window, is it possible to use any options to set a color space (e.g., BT.709 or DCI-P3) of our choice? For example, can we use the zscale or libplacebo parameters?

4 9

lcms2 support for ffmpeg's configure
by Andrew Randrianasulu 02 May '26

02 May '26

Default to auto, works with lcms2 2.18

2 4

another web page with icc profile check
by Andrew Randrianasulu 01 May '26

01 May '26

https://chromachecker.com/page/en/show/web_browser_tester works in ff 140.9.1esr (32-bit) I see "better" than sRGB images even on my 8bpc, HDMI->VGA connected monitor. But if I save two images and try to load them in cingg even compiled with lcms2 support and flags2=icc_profiles set in decode.opts I do not see any difference! cin /dev/shm/gradient\ *.jpg I toggle top track and text changes but relative width of green bar (very visible in gimp when you compare those two) does not change. So for now I think we can conclude color profiles in image actually not supported on reading/displaying ? writing ffmpeg/png with whole set of trc/primaries params (in avcodec kind of encoder params gui) gives you some embedded profile, so I think lcms2 support in embedded ffmpeg libs is working. I tried to add .opts file with video_filter=iccgen but it does not change anything :(

2 7

Brief maintenance window today + new forum coming soon
by Sam 01 May '26

01 May '26

Hi everyone, just a quick heads-up: the Cinelerra-GG server will be briefly offline today for maintenance work. We expect the downtime to be short. We're also happy to share that we're working on a new forum for the Cinelerra-GG community, which we plan to launch soon. It will replace the current WordPress-based forum with a modern, dedicated forum platform — more on that shortly. Sorry for any inconvenience and thanks for your patience! Cheers Sam

3 5

Announce about new appimages
by Andrew Randrianasulu 01 May '26

01 May '26

I see it in our archive: https://lists.cinelerra-gg.org/archives/list/cin@lists.cinelerra-gg.org/thr… but not in my inbox. About Andrew/Terje: are we at the point where "qsv" should be added as a choice in Settings->Preferences, Performance "Use HW Device"? I think qsv/mediacodec initialized slightly differently from the rest of hwaccels, so for now it only work if you manually override decoder in decode.opts I'll think about making it automatic, but not sure if I'll find any working idea

1 0

Updated AppImages because of dlfcn oversight
by Phyllis Smith 01 May '26

01 May '26

Just minor changes in the AppImages, but I updated them for the month because somehow I mistakenly left out dlfcn from system installs (choice of syslib programs) as recently discovered by Andrew. Andrew/Terje: are we at the point where "qsv" should be added as a choice in Settings->Preferences, Performance "Use HW Device"? **** GIT for Cinelerra-GG has the following changes from 04/01/2026-04/30/2026 **** *Andrew-R* work: For BlendAlgebra, dlfcn was missing from system installs. Fixed so that now picking syslib correctly opens folder with preinstalled programs. For Termux, a52 and mjpegtools build changes needed: - fix mjpegtools build with clang/termux by setting cflags to -std=gnu11, - add std=c11 to a52 cflags which fixes autoconf 2.73 + clang 21.1 build on termux/aarch64, + option of “termux” added to blds/bld_prepare.sh as requested by user. Libaom “make” parameters modified to build with nasm instead of yasm so that older systems, such as ubuntu 16, will successfully compile current libaom version 3.8.0. For newer Nasm version 3.01 error of “Unsupported nasm: multipass optimization not supported” when building libaom has been fixed by adding another patch. Early discovery of issue by *Andrea*. Added to cinelerra/ffmpeg.c QSV hardware decode option to facilitate *Terje* testing.

1 1