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如何通过 FFmpeg 传递颜色

tag-icon • tag-icon ffmpeg video colors video-conversion color-depth
如何通过 FFmpeg 传递颜色

我注意到，过去几个月我编码的视频比原始视频稍微黄一些。这非常烦人，因为我原本以为默认行为会传递颜色信息。难道不是这样吗？

我正在将 转码为libvpx。libx264以下是我运行的最后一个发生此问题的命令的输出：

ffmpeg -i "source.mkv" -preset ultrafast -to 6:53 -c:v libx264 -crf 15 -c:a copy -vf "crop=320:160:0:40,scale=-2:1080" "test.mp4"
ffmpeg version N-100422-gff6f8c272e-g1eb751955e+1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration:  --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --disable-autodetect --enable
-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-
lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --en
able-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --e
nable-libdav1d --enable-libaom --disable-debug --enable-libfdk-aac --enable-openssl --extra-libs=-liconv
--enable-gpl --enable-nonfree
  libavutil      56. 62.100 / 56. 62.100
  libavcodec     58.115.102 / 58.115.102
  libavformat    58. 65.100 / 58. 65.100
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter     7. 93.100 /  7. 93.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, matroska,webm, from 'source.mkv':
  Metadata:
    ENCODER         : Lavf58.65.100
  Duration: 00:07:49.28, start: 0.000000, bitrate: 240 kb/s
    Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv), 320x240, SAR 1:1 DAR 4:3, 18 fps, 18 tbr, 1k t
bn, 1k tbc (default)
    Metadata:
      DURATION        : 00:07:49.221000000
    Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp (default)
    Metadata:
      HANDLER_NAME    : ISO Media file produced by Google Inc. Created on: 05/11/2019.
      VENDOR_ID       : [0][0][0][0]
      DURATION        : 00:07:49.275000000
Stream mapping:
  Stream #0:0 -> #0:0 (vp9 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[libx264 @ 000002575cffe040] using SAR=1/1
[libx264 @ 000002575cffe040] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 000002575cffe040] profile Constrained Baseline, level 5.0, 4:2:0, 8-bit
[libx264 @ 000002575cffe040] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 -
 http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=
1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip
=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_
compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=18 scenecut=0 intra_refresh=0 rc=c
rf mbtree=0 crf=15.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, mp4, to 'test.mp4':
  Metadata:
    encoder         : Lavf58.65.100
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p(tv, progressive), 2160x1080 [SAR 1:1 DAR 2
:1], q=2-31, 18 fps, 18432 tbn (default)
    Metadata:
      DURATION        : 00:07:49.221000000
      encoder         : Lavc58.115.102 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp (default)
    Metadata:
      HANDLER_NAME    : ISO Media file produced by Google Inc. Created on: 05/11/2019.
      VENDOR_ID       : [0][0][0][0]
      DURATION        : 00:07:49.275000000
frame= 7434 fps= 47 q=-1.0 Lsize=  748614kB time=00:06:52.99 bitrate=14849.4kbits/s speed=2.62x
video:741826kB audio:6454kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.044636%
[libx264 @ 000002575cffe040] frame I:30    Avg QP:10.10  size:284105
[libx264 @ 000002575cffe040] frame P:7404  Avg QP:12.51  size:101446
[libx264 @ 000002575cffe040] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 000002575cffe040] mb P  I16..4: 14.4%  0.0%  0.0%  P16..4: 71.5%  0.0%  0.0%  0.0%  0.0%    sk
ip:14.1%
[libx264 @ 000002575cffe040] coded y,uvDC,uvAC intra: 45.1% 37.2% 14.8% inter: 53.1% 32.5% 0.9%
[libx264 @ 000002575cffe040] i16 v,h,dc,p: 45% 20% 10% 25%
[libx264 @ 000002575cffe040] i8c dc,h,v,p: 47% 17% 21% 15%
[libx264 @ 000002575cffe040] kb/s:14714.37

我如何传递源的颜色信息，以便输出的颜色始终与源的颜色相同？

答案1

自从2020 年 10 月，ffmpeg 将在源中检测到的比色特性传递到目标，因此请确保您的 ffmpeg 比该版本更新。4.4 是具有此更改的最旧版本。

答案2

我真的无法接受 FFmpeg 的默认行为是丢弃源的颜色信息，并且是默默地丢弃，只能希望这个问题能尽快得到解决。

同时，似乎必须通过指定颜色元数据来明确传递这些信息。

就我自己的情况来说，添加：

-color_primaries smpte170m -color_trc smpte170m -colorspace smpte170m

我的命令似乎足以保留我自己的来源的色彩空间。

感谢 llogan关联这些命令来自哪里。

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