Hi all, I've run into a problem when converting a j2c image sequence to ProRes. The dark levels look horrible, especially dark gradients, which seem like posterized. The bright levels seem to look better. I think it's a problem related to 12 bit to 10 bit conversion. Is there anything I can do to make it look better?
Here you can download a short segment (30 MB) of j2c frames and the resulting Prores: http://we.tl/OGbZBVydwO And here is my command line, which I have used in the past with perfect results. Thank you! ffmpeg -r 24 -i MAGGIE_FTR-6_S_EN-XX_US_51_2K_IND_20150224_FKI_OV_01/frm_%6d.j2c -c:v prores -profile:v 3 -r 24 OUTPUT.mov ffmpeg version 2.4.2 Copyright (c) 2000-2014 the FFmpeg developers built on Oct 28 2014 17:39:46 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn) configuration: --prefix=/usr/local/Cellar/ffmpeg/2.4.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc --enable-libass --enable-ffplay --enable-libspeex --enable-libschroedinger --enable-libfdk-aac --enable-libopus --enable-frei0r --enable-libopenjpeg --extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.1_1/include/openjpeg-1.5 ' libavutil 54. 7.100 / 54. 7.100 libavcodec 56. 1.100 / 56. 1.100 libavformat 56. 4.101 / 56. 4.101 libavdevice 56. 0.100 / 56. 0.100 libavfilter 5. 1.100 / 5. 1.100 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 0.100 / 3. 0.100 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 0.100 / 53. 0.100 Input #0, image2, from 'MAGGIE_FTR-6_S_EN-XX_US_51_2K_IND_20150224_FKI_OV_01/frm_%6d.j2c': Duration: 00:15:16.16, start: 0.000000, bitrate: N/A Stream #0:0: Video: jpeg2000 (JPEG 2000 digital cinema 2K), xyz12le, 2048x858, 25 fps, 25 tbr, 25 tbn, 25 tbc Output #0, mov, to 'OUTPUT.mov': Metadata: encoder : Lavf56.4.101 Stream #0:0: Video: prores (apch) (apch / 0x68637061), yuv422p10le, 2048x858, q=2-31, 200 kb/s, 24 fps, 12288 tbn, 24 tbc Metadata: encoder : Lavc56.1.100 prores Stream mapping: Stream #0:0 -> #0:0 (jpeg2000 (native) -> prores (native)) Press [q] to stop, [?] for help frame= 147 fps= 14 q=0.0 Lsize= 55877kB time=00:00:06.12 bitrate=74733.3kbits/s video:55875kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002896% _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
