我是一个ffmpeg菜鸟。我确实花了30分钟谷歌搜索stackoverflow，但没有找到答案。
我的设计师为我制作了一些动画制作的视频。他们很棒，但很大。所以我尝试通过ffmpeg传递它们。它们小10倍，看起来不像素化 - 太棒了！ - 但颜色大大减少了。当我在我的macbook上或在应用程序中查看它时，原始中的亮红色/粉红色在输出中变成灰色 - 灰色 - 红色（iOS - 即在iPhone 5S上你可以看到丢失的颜色）。如何让颜色保持不变（ish）？
ffmpeg -i original.mp4
告诉我这个：
ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
built with Apple LLVM version 7.0.0 (clang-700.0.72)
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 --enable-videotoolbox --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '01 Introanimation@25fps_2.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
creation_time : 2015-10-28 22:08:44
Duration: 00:00:16.00, start: 0.000000, bitrate: 1613 kb/s
Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x720, 1434 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
Metadata:
creation_time : 2015-10-28 22:08:44
handler_name : Alias Data Handler
encoder : AVC Coding
......到目前为止我试过......
ffmpeg -i original.mp4 -vf format=yuvj420p -color_range 2 -vcodec libx264 out.mp4
......和其他许多人一样，但没有运气。
Original.mp4在这里：http://fuzzymunchkin.com/tmp/original.mp4
编辑：按要求发布（无参数）转化的输出。
ffmpeg -i original.mp4 out.mp4
ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
built with Apple LLVM version 7.0.0 (clang-700.0.72)
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 --enable-videotoolbox --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'original.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
creation_time : 2015-10-28 22:08:44
Duration: 00:00:16.00, start: 0.000000, bitrate: 1613 kb/s
Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x720, 1434 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
Metadata:
creation_time : 2015-10-28 22:08:44
handler_name : Alias Data Handler
encoder : AVC Coding
[libx264 @ 0x7f8a5b80ea00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
[libx264 @ 0x7f8a5b80ea00] profile High, level 3.1
[libx264 @ 0x7f8a5b80ea00] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'out.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
encoder : Lavf56.40.101
Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x720, q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
creation_time : 2015-10-28 22:08:44
handler_name : Alias Data Handler
encoder : Lavc56.60.100 libx264
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame= 400 fps=0.0 q=-1.0 Lsize= 262kB time=00:00:15.92 bitrate= 134.9kbits/s
video:257kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.971545%
[libx264 @ 0x7f8a5b80ea00] frame I:2 Avg QP:13.86 size: 9730
[libx264 @ 0x7f8a5b80ea00] frame P:174 Avg QP:21.01 size: 1121
[libx264 @ 0x7f8a5b80ea00] frame B:224 Avg QP:20.88 size: 215
[libx264 @ 0x7f8a5b80ea00] consecutive B-frames: 19.2% 17.0% 3.8% 60.0%
[libx264 @ 0x7f8a5b80ea00] mb I I16..4: 62.9% 26.0% 11.1%
[libx264 @ 0x7f8a5b80ea00] mb P I16..4: 3.7% 1.0% 0.7% P16..4: 3.0% 1.5% 0.8% 0.0% 0.0% skip:89.3%
[libx264 @ 0x7f8a5b80ea00] mb B I16..4: 0.4% 0.1% 0.0% B16..8: 3.3% 0.5% 0.0% direct: 0.0% skip:95.6% L0:47.0% L1:43.5% BI: 9.5%
[libx264 @ 0x7f8a5b80ea00] 8x8 transform intra:19.3% inter:33.8%
[libx264 @ 0x7f8a5b80ea00] coded y,uvDC,uvAC intra: 7.4% 6.8% 5.5% inter: 0.5% 0.6% 0.5%
[libx264 @ 0x7f8a5b80ea00] i16 v,h,dc,p: 70% 29% 1% 0%
[libx264 @ 0x7f8a5b80ea00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 7% 77% 1% 0% 0% 0% 0% 0%
[libx264 @ 0x7f8a5b80ea00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 23% 29% 3% 2% 2% 2% 1% 1%
[libx264 @ 0x7f8a5b80ea00] i8c dc,h,v,p: 74% 10% 15% 0%
[libx264 @ 0x7f8a5b80ea00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7f8a5b80ea00] ref P L0: 64.1% 5.3% 17.6% 12.9%
[libx264 @ 0x7f8a5b80ea00] ref B L0: 77.4% 19.7% 2.9%
[libx264 @ 0x7f8a5b80ea00] ref B L1: 95.5% 4.5%
[libx264 @ 0x7f8a5b80ea00] kb/s:131.31
答案 0 :(得分：7)
如果您添加-x264opts colormatrix=bt709并删除-vf format=yuvj420p -color_range 2，则可能会看到改进。