On 9/14/22, Dan <twinbe...@skytopia.com> wrote: > Using the latest 5.1.1 "essentials build" by www.gyan.dev. > > Hi all, I'm a beginner to ffmpeg so I'm having a hard time believing that a > utility so old and so widely used has such a fundamental bug, but the > evidence is staring me in the face and leads me to no other conclusion. > > It's incredibly easy to replicate thankfully. I want to convert numerous > frames to make an animation, but thankfully, I've simplified the problem to > even using a single image to make a '1 frame video' for the purposes of > debugging. > > Simply perform this command line:
Scale filter may give different colors depending on frame dimensions. Use zscale filter instead. > > ffmpeg.exe -i original.png -crf 0 -vcodec libx264 output.mp4 > > ...With this "original.png" ("fC2Tj") image: > https://i.stack.imgur.com/5jkct.png > > And this command line: > > ffmpeg.exe -i doubleHeight.png -crf 0 -vcodec libx264 output.mp4 > > ...On this "doubleHeight" ("RGIvA") image: > https://i.stack.imgur.com/PLdsb.png > > The double height version is darker than it should be. I've checked the > resulting video in both Media Player Classic and Chrome. > > If you check the dark green colour on the original PNG images, using an eye > dropper tool, they're both R=25,G=74,B=15. However, if you check the same > colour on the output MP4s, the colour matches on the original PNG, but not > the doubleHeight version, which is R=22,G=66,B=12. > > If I use -vcodec libx264rgb, instead of -vcodec libx264, that fixes the > issue, but I need libx264 so the output video can work on Chrome and other > media players. > > What gives? CLI output below (for the double height version): > > ------------------------------------------------------------------------------- > > D:\Utils\ffmpeg\bin\ffmpeg.exe -i > C:\Users\<USERNAME>\Desktop\testcol\PLdsb.png -crf 0 -vcodec libx264 > C:\Users\<USERNAME>\Desktop\testcol\PLdsb.mp4 > ffmpeg version 5.1.1-essentials_build-www.gyan.dev Copyright (c) 2000-2022 > the FFmpeg developers > built with gcc 12.1.0 (Rev2, Built by MSYS2 project) > configuration: --enable-gpl --enable-version3 --enable-static > --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv > --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib > --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth > --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 > --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx > --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab > --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm > --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc > --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme > --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame > --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm > --enable-libopencore-amrnb --enable-libopus --enable-libspeex > --enable-libvorbis --enable-librubberband > libavutil 57. 28.100 / 57. 28.100 > libavcodec 59. 37.100 / 59. 37.100 > libavformat 59. 27.100 / 59. 27.100 > libavdevice 59. 7.100 / 59. 7.100 > libavfilter 8. 44.100 / 8. 44.100 > libswscale 6. 7.100 / 6. 7.100 > libswresample 4. 7.100 / 4. 7.100 > libpostproc 56. 6.100 / 56. 6.100 > Input #0, png_pipe, from 'C:\Users\<USERNAME>\Desktop\testcol\PLdsb.png': > Duration: N/A, bitrate: N/A > Stream #0:0: Video: png, rgb24(pc), 968x984, 25 fps, 25 tbr, 25 tbn > Stream mapping: > Stream #0:0 -> #0:0 (png (native) -> h264 (libx264)) > Press [q] to stop, [?] for help > [libx264 @ 000001b24acb3400] using cpu capabilities: MMX2 SSE2Fast SSSE3 > SSE4.2 AVX FMA3 BMI2 AVX2 AVX512 > [libx264 @ 000001b24acb3400] profile High 4:4:4 Predictive, level 3.2, > 4:4:4, 8-bit > [libx264 @ 000001b24acb3400] 264 - core 164 r3095 baee400 - H.264/MPEG-4 AVC > codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html - options: > cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=0 > mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 > fast_pskip=0 chroma_qp_offset=0 threads=12 lookahead_threads=2 > sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 > constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 > intra_refresh=0 rc=cqp mbtree=0 qp=0 > Output #0, mp4, to 'C:\Users\<USERNAME>\Desktop\testcol\PLdsb.mp4': > Metadata: > encoder : Lavf59.27.100 > Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv444p(tv, progressive), > 968x984, q=2-31, 25 fps, 12800 tbn > Metadata: > encoder : Lavc59.37.100 libx264 > Side data: > cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A > frame= 1 fps=0.0 q=0.0 Lsize= 2kB time=00:00:00.00 > bitrate=180512.8kbits/s speed=0.0017x > video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing > overhead: 88.235291% > [libx264 @ 000001b24acb3400] frame I:1 Avg QP: 0.00 size: 405 > [libx264 @ 000001b24acb3400] mb I I16..4: 83.5% 16.4% 0.1% > [libx264 @ 000001b24acb3400] 8x8 transform intra:16.4% > [libx264 @ 000001b24acb3400] coded y,u,v intra: 0.0% 0.0% 0.0% > [libx264 @ 000001b24acb3400] i16 v,h,dc,p: 100% 0% 0% 0% > [libx264 @ 000001b24acb3400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 41% 0% 59% 0% > 0% 0% 0% 0% 0% > [libx264 @ 000001b24acb3400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 6% 56% 0% > 0% 0% 0% 0% 0% > [libx264 @ 000001b24acb3400] kb/s:81.00 > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".