- Cin - Cinelerra-GG Mailing Lists

hevc alpha decoding in cingg
by Andrew Randrianasulu 12 May '26

12 May '26

Sending to ffmpeg-devel because I do not know if my workaround makes any sense? For some reason hevc alpha decoding was not working for us. I picked up https://source.ffmpeg.org/gitweb/ffmpeg.git/commit/eedf8f0165fe6523be692c5a… avcodec/hevc: workaround hevc-alpha videos generated by VideoToolbox but videos were still not showing their alpha channel. So I added this to libavcodec/hevc/hevcdec.c: --- ./libavcodec/hevc/hevcdec.c 2026-03-16 18:13:04.000000000 +0000 +++ ./libavcodec/hevc/hevcdec.c.new 2026-05-09 05:22:45.098799320 +0000 @@ -712,9 +712,11 @@ break; } + if (alpha_fmt != AV_PIX_FMT_NONE) *fmt++ = alpha_fmt; - *fmt++ = sps->pix_fmt; + if(alpha_fmt == AV_PIX_FMT_NONE) + *fmt++ = sps->pix_fmt; *fmt = AV_PIX_FMT_NONE; // export multilayer information from active VPS to the caller, ==== basically only adding main layer (?) formats if there was no alpha) It seems to work with two hevc-alpha files and one normal hevc file May be this is only cingg specific problem - due to way we pick pixel formats on decoding? ffmpeg itself works ok without this workaround Even with this patch ffmpeg cli still picks correct format, on encoding to png: thirdparty/ffmpeg-8.1/ffmpeg -i /dev/shm/av1--test.mp4 -vframes 1 1.png 1.png contain transparency test files from https://developer.apple.com/documentation/avfoundation/using-hevc-video-wit… more test files: https://lf-tk-sg.ibytedtos.com/obj/tcs-client-sg/resources/video_demo_hevc.… possibly related https://trac.ffmpeg.org/ticket/10901 HEVC with alpha to PNG does not maintain alpha

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Patch: do not build turbojpeg-specific library, we do not use it
by Andrew Randrianasulu 10 May '26

10 May '26

Hopefully I got this correct, did partial rebuild on x86-64 Rosa 2016 Will try to integrate x265 4.2.0 next

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HEIC tiled images
by Andrew Randrianasulu 09 May '26

09 May '26

Today I learned some HEIC images present themselves as bunch (up to 49!) of smaller tiles in cinelerra-GG and mpv. https://github.com/mpv-player/mpv/issues/13585 ffmpeg itself automerges them now, so this work (ffmpeg git cli): /dev/shm/ffmpeg/ffmpeg -i /dev/shm/IMG_4453.HEIC /dev/shm/grid.png bash-5.1$ /dev/shm/ffmpeg/ffmpeg -i /dev/shm/IMG_4453.HEIC /dev/shm/grid.png ffmpeg version N-123229-gf2e5eff3ff Copyright (c) 2000-2026 the FFmpeg developers built with gcc 11.2.0 (GCC) configuration: --enable-opencl --disable-debug --enable-libx265 --enable-libx264 --enable-gpl --enable-libplacebo --enable-vulkan --enable-libshaderc --enable-libzimg --enable-libaom --enable-libdav1d --enable-libsoxr --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gnutls --enable-libass --enable-libbluray --enable-libcdio --enable-frei0r --enable-libgsm --enable-openal --enable-libopus --enable-librtmp --enable-libsnappy --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp libavutil 60. 30.100 / 60. 30.100 libavcodec 62. 30.100 / 62. 30.100 libavformat 62. 15.100 / 62. 15.100 libavdevice 62. 4.100 / 62. 4.100 libavfilter 11. 17.100 / 11. 17.100 libswscale 9. 7.100 / 9. 7.100 libswresample 6. 4.100 / 6. 4.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/dev/shm/IMG_4453.HEIC': Metadata: major_brand : heic minor_version : 0 compatible_brands: mif1heic Duration: N/A, start: 0.000000, bitrate: N/A Stream group #0:0[0x31]: Tile Grid: hevc (Main Still Picture) (hvc1 / 0x31637668), yuvj420p(pc), 4032x3024 (default) Side data: EXIF metadata: (2012 bytes) Stream #0:48[0x32]: Video: hevc (Main Still Picture) (hvc1 / 0x31637668), yuvj420p(pc), 320x240, 1 fps, 1 tbr, 1 tbn Side data: ICC Profile: (548 bytes) Stream mapping: Stream #0:0 (hevc) -> xstack Stream #0:1 (hevc) -> xstack Stream #0:2 (hevc) -> xstack Stream #0:3 (hevc) -> xstack Stream #0:4 (hevc) -> xstack Stream #0:5 (hevc) -> xstack Stream #0:6 (hevc) -> xstack Stream #0:7 (hevc) -> xstack Stream #0:8 (hevc) -> xstack Stream #0:9 (hevc) -> xstack Stream #0:10 (hevc) -> xstack Stream #0:11 (hevc) -> xstack Stream #0:12 (hevc) -> xstack Stream #0:13 (hevc) -> xstack Stream #0:14 (hevc) -> xstack Stream #0:15 (hevc) -> xstack Stream #0:16 (hevc) -> xstack Stream #0:17 (hevc) -> xstack Stream #0:18 (hevc) -> xstack Stream #0:19 (hevc) -> xstack Stream #0:20 (hevc) -> xstack Stream #0:21 (hevc) -> xstack Stream #0:22 (hevc) -> xstack Stream #0:23 (hevc) -> xstack Stream #0:24 (hevc) -> xstack Stream #0:25 (hevc) -> xstack Stream #0:26 (hevc) -> xstack Stream #0:27 (hevc) -> xstack Stream #0:28 (hevc) -> xstack Stream #0:29 (hevc) -> xstack Stream #0:30 (hevc) -> xstack Stream #0:31 (hevc) -> xstack Stream #0:32 (hevc) -> xstack Stream #0:33 (hevc) -> xstack Stream #0:34 (hevc) -> xstack Stream #0:35 (hevc) -> xstack Stream #0:36 (hevc) -> xstack Stream #0:37 (hevc) -> xstack Stream #0:38 (hevc) -> xstack Stream #0:39 (hevc) -> xstack Stream #0:40 (hevc) -> xstack Stream #0:41 (hevc) -> xstack Stream #0:42 (hevc) -> xstack Stream #0:43 (hevc) -> xstack Stream #0:44 (hevc) -> xstack Stream #0:45 (hevc) -> xstack Stream #0:46 (hevc) -> xstack Stream #0:47 (hevc) -> xstack xstack:default -> Stream #0:0 (png) Press [q] to stop, [?] for help [swscaler @ 0xf3300040] deprecated pixel format used, make sure you did set range correctly Output #0, image2, to '/dev/shm/grid.png': Metadata: major_brand : heic minor_version : 0 compatible_brands: mif1heic encoder : Lavf62.15.100 Stream #0:0: Video: png, rgb24(pc, gbr/unknown/unknown, progressive), 4032x3024, q=2-31, 200 kb/s, 1 fps, 1 tbn Metadata: encoder : Lavc62.30.100 png Side data: ICC Profile: (548 bytes) EXIF metadata: (2012 bytes) [image2 @ 0xb8a1dc0] The specified filename '/dev/shm/grid.png' does not contain an image sequence pattern or a pattern is invalid. [image2 @ 0xb8a1dc0] Use a pattern such as %03d for an image sequence or use the -update option (with -frames:v 1 if needed) to write a single image. [out#0/image2 @ 0xbeb0e80] video:9222KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown frame= 1 fps=0.1 q=-0.0 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=0.0853x elapsed=0:00:11.73 https://trac.ffmpeg.org/ticket/11170 was closed with this ffmpeg commit in oct 2025 https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/5ff8395e7806ad27743829b0470… "fftools/ffmpeg_demux: create a filtegraph to merge HEIF tiles automatically" some test files from https://github.com/nokiatech/heif/tree/gh-pages/content/images decode in cingg as "just" 8 or so streams/tracks, you can disable them one by one and del low res versions, and combine hires images on single track manually) So much new technology :}

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OpenColorIO
by Andrea paz 09 May '26

09 May '26

I'm starting a new post because the one about Lcms2 is already too long. Now ./configure works for me with --with-opencolorio. However, when I start CinGG for the first time, I get these lines: [OpenColorIO Info]: Color management disabled. (Specify the $OCIO environment variable to enable.) [ocio_616 @ 0x562a521bd680] Error: Config or arguments invalid. [ocio_616 @ 0x562a521bd680] Input color space is null [ocio_616 @ 0x562a521bd680] Display is null [ocio_616 @ 0x562a521bd680] View is null [ocio_616 @ 0x562a521bd680] Failed to create OCIO processor. PluginFFilter::new_ffilter(ocio) And the opencolorio filter doesn't show up. I'm not sure which environment variable to use. Trying to use $OCIO prevents CinGG from starting, saying that this variable doesn't exist.

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New patch to alter file loading from command line
by Andrew Randrianasulu 09 May '26

09 May '26

I thought it may be useful to alter default "Add filenames from command line to new track" behavior, and made new cmd line switch "-l", that can be set to anything, but useful values I tested are: 2 - load concatenated on one track (for jpegs) 6 - load as resources only Default is 1 as before Usage: bin/cin -l 6 ~/*.jpg or bin/cin -l 2 ~/*.jpg Please test if possible, and even merge if it doesn't add regressions

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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)

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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

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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.

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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?)

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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?

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