How can I create high quality JPEGs with ffmpeg? Using qscale 0 helps, but it still produces a file with noticeably less detail than the original, and macro blocking.
$ ffmpeg -i 0.tiff -qscale:v 0 0.jpeg ffmpeg version 2.5.git Copyright (c) 2000-2015 the FFmpeg developers built on Feb 8 2015 16:44:44 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn) configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid --enable-nonfree --enable-libfdk-aac --enable-libfaac libavutil 54. 17.100 / 54. 17.100 libavcodec 56. 20.100 / 56. 20.100 libavformat 56. 19.100 / 56. 19.100 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 8.100 / 5. 8.100 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 3.100 / 53. 3.100 [tiff_pipe @ 0x7f9f8381bc00] Stream #0: not enough frames to estimate rate; consider increasing probesize Input #0, tiff_pipe, from '0.tiff': Duration: N/A, bitrate: N/A Stream #0:0: Video: tiff, rgb48le, 2048x1152 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc File '0.jpeg' already exists. Overwrite ? [y/N] y [swscaler @ 0x7f9f83812800] deprecated pixel format used, make sure you did set range correctly Output #0, image2, to '0.jpeg': Metadata: encoder : Lavf56.19.100 Stream #0:0: Video: mjpeg, yuvj444p(pc), 2048x1152 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc Metadata: encoder : Lavc56.20.100 mjpeg Stream mapping: Stream #0:0 -> #0:0 (tiff (native) -> mjpeg (native)) Press [q] to stop, [?] for help frame= 1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A video:270kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
