FFmpegを使用してx264でEXRファイルシーケンスを変換し、色空間を線形からSRGB(ガンマ0.45454545)に変換すると、いくつかの重いバンディングの問題が発生します(暗いグラデーションで最も目立ちます)。私にとっては、最初にビデオを変換し、その後、8ビットのクリップされたビデオにガンマ補正を適用するように見えます。もしそうなら、最初に画像シーケンスを線形からsrgに変換してから、Quicktimeに変換することはどういうわけか可能ですか?
これが私が使用するffmpegコマンドです:
C:/ffmpeg.exe -y -i C:/seq_v001.%04d.exr -vf lutrgb=r=gammaval(0.45454545):g=gammaval(0.45454545):b=gammaval(0.45454545) -vcodec libx264 -pix_fmt yuv420p -preset slow -crf 18 -r 25 C:/out.mov
出力は次のとおりです。
ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
built on Nov 25 2012 12:25:21 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-pthreads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 9.100 / 52. 9.100
libavcodec 54. 77.100 / 54. 77.100
libavformat 54. 37.100 / 54. 37.100
libavdevice 54. 3.100 / 54. 3.100
libavfilter 3. 23.102 / 3. 23.102
libswscale 2. 1.102 / 2. 1.102
libswresample 0. 17.101 / 0. 17.101
libpostproc 52. 2.100 / 52. 2.100
Input #0, image2, from 'C:/seq_v001.%04d.exr':
Duration: 00:00:09.60, start: 0.000000, bitrate: N/A
Stream #0:0: Video: exr, rgb48le, 960x540 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
[libx264 @ 0000000004d11540] using SAR=1/1
[libx264 @ 0000000004d11540] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
[libx264 @ 0000000004d11540] profile High, level 3.1
[libx264 @ 0000000004d11540] 264 - core 128 r2216 198a7ea - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 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=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mov, to 'C:/out.mov':
Metadata:
encoder : Lavf54.37.100
Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p, 960x540 [SAR 1:1 DAR 16:9], q=-1--1, 12800 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (exr -> libx264)
Press [q] to stop, [?] for help
[exr @ 000000000dff8c40] Found more than one compression attribute
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frame= 16 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
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frame= 34 fps= 33 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
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[exr @ 000000000dffb7a0] Found more than one compression attribute
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frame= 52 fps= 34 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
Found more than one compression attribute
[exr @ 000000000dff8c40] Found more than one compression attribute
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[exr @ 000000000dffb7a0] Found more than one compression attribute
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frame= 68 fps= 34 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
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[exr @ 000000000dff9960] Found more than one compression attribute
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[exr @ 000000000dff90c0] Found more than one compression attribute
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frame= 85 fps= 33 q=23.0 size= 47kB time=00:00:00.44 bitrate= 867.5kbits/s
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[exr @ 000000000dffaaa0] Found more than one compression attribute
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[exr @ 000000000dffb340] Found more than one compression attribute
[exr @ 000000000dffb7a0] Found more than one compression attribute
[exr @ 000000000dffbbe0] Found more than one compression attribute
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frame= 104 fps= 34 q=23.0 size= 94kB time=00:00:01.20 bitrate= 640.3kbits/s
Found more than one compression attribute
[exr @ 000000000dff8c40] Found more than one compression attribute
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[exr @ 000000000dff9960] Found more than one compression attribute
[exr @ 000000000dff9dc0] Found more than one compression attribute
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[exr @ 000000000dffa660] Found more than one compression attribute
[exr @ 000000000dffaaa0] Found more than one compression attribute
[exr @ 000000000dffaf00] Found more than one compression attribute
[exr @ 000000000dffb340] Found more than one compression attribute
[exr @ 000000000dffb7a0] Found more than one compression attribute
[exr @ 000000000dffbbe0] Found more than one compression attribute
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[exr @ 000000000dff8c40] Found more than one compression attribute
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frame= 121 fps= 34 q=23.0 size= 133kB time=00:00:01.88 bitrate= 577.8kbits/s
Found more than one compression attribute
[exr @ 000000000dff9dc0] Found more than one compression attribute
[exr @ 000000000dffa200] Found more than one compression attribute
[exr @ 000000000dffa660] Found more than one compression attribute
[exr @ 000000000dffaaa0] Found more than one compression attribute
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[exr @ 000000000dffb340] Found more than one compression attribute
[exr @ 000000000dffb7a0] Found more than one compression attribute
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[exr @ 000000000dffc040] Found more than one compression attribute
[exr @ 000000000dff8c40] Found more than one compression attribute
[exr @ 000000000dff90c0] Found more than one compression attribute
[exr @ 000000000dff9520] Found more than one compression attribute
[exr @ 000000000dff9960] Found more than one compression attribute
[exr @ 000000000dff9dc0] Found more than one compression attribute
[exr @ 000000000dffa200] Found more than one compression attribute
[exr @ 000000000dffa660] Found more than one compression attribute
[exr @ 000000000dffaaa0] Found more than one compression attribute
frame= 139 fps= 34 q=23.0 size= 172kB time=00:00:02.60 bitrate= 543.4kbits/s
Found more than one compression attribute
[exr @ 000000000dffb340] Found more than one compression attribute
[exr @ 000000000dffb7a0] Found more than one compression attribute
[exr @ 000000000dffbbe0] Found more than one compression attribute
[exr @ 000000000dffc040] Found more than one compression attribute
[exr @ 000000000dff8c40] Found more than one compression attribute
[exr @ 000000000dff90c0] Found more than one compression attribute
[exr @ 000000000dff9520] Found more than one compression attribute
[exr @ 000000000dff9960] Found more than one compression attribute
[exr @ 000000000dff9dc0] Found more than one compression attribute
[exr @ 000000000dffa200] Found more than one compression attribute
[exr @ 000000000dffa660] Found more than one compression attribute
[exr @ 000000000dffaaa0] Found more than one compression attribute
[exr @ 000000000dffaf00] Found more than one compression attribute
[exr @ 000000000dffb340] Found more than one compression attribute
[exr @ 000000000dffb7a0] Found more than one compression attribute
[exr @ 000000000dffbbe0] Found more than one compression attribute
[exr @ 000000000dffc040] Found more than one compression attribute
frame= 157 fps= 34 q=23.0 size= 213kB time=00:00:03.32 bitrate= 525.6kbits/s
Found more than one compression attribute
[exr @ 000000000dff90c0] Found more than one compression attribute
[exr @ 000000000dff9520] Found more than one compression attribute
[exr @ 000000000dff9960] Found more than one compression attribute
[exr @ 000000000dff9dc0] Found more than one compression attribute
[exr @ 000000000dffa200] Found more than one compression attribute
[exr @ 000000000dffa660] Found more than one compression attribute
[exr @ 000000000dffaaa0] Found more than one compression attribute
[exr @ 000000000dffaf00] Found more than one compression attribute
[exr @ 000000000dffb340] Found more than one compression attribute
[exr @ 000000000dffb7a0] Found more than one compression attribute
[exr @ 000000000dffbbe0] Found more than one compression attribute
[exr @ 000000000dffc040] Found more than one compression attribute
[exr @ 000000000dff8c40] Found more than one compression attribute
[exr @ 000000000dff90c0] Found more than one compression attribute
[exr @ 000000000dff9520] Found more than one compression attribute
[exr @ 000000000dff9960] Found more than one compression attribute
[exr @ 000000000dff9dc0] Found more than one compression attribute
frame= 175 fps= 34 q=23.0 size= 254kB time=00:00:04.04 bitrate= 516.0kbits/s
Found more than one compression attribute
[exr @ 000000000dffa660] Found more than one compression attribute
[exr @ 000000000dffaaa0] Found more than one compression attribute
[exr @ 000000000dffaf00] Found more than one compression attribute
[exr @ 000000000dffb340] Found more than one compression attribute
[exr @ 000000000dffb7a0] Found more than one compression attribute
[exr @ 000000000dffbbe0] Found more than one compression attribute
[exr @ 000000000dffc040] Found more than one compression attribute
[exr @ 000000000dff8c40] Found more than one compression attribute
[exr @ 000000000dff90c0] Found more than one compression attribute
[exr @ 000000000dff9520] Found more than one compression attribute
[exr @ 000000000dff9960] Found more than one compression attribute
[exr @ 000000000dff9dc0] Found more than one compression attribute
[exr @ 000000000dffa200] Found more than one compression attribute
[exr @ 000000000dffa660] Found more than one compression attribute
[exr @ 000000000dffaaa0] Found more than one compression attribute
[exr @ 000000000dffaf00] Found more than one compression attribute
[exr @ 000000000dffb340] Found more than one compression attribute
frame= 193 fps= 35 q=23.0 size= 287kB time=00:00:04.76 bitrate= 494.6kbits/s
Found more than one compression attribute
[exr @ 000000000dffbbe0] Found more than one compression attribute
[exr @ 000000000dffc040] Found more than one compression attribute
[exr @ 000000000dff8c40] Found more than one compression attribute
[exr @ 000000000dff90c0] Found more than one compression attribute
[exr @ 000000000dff9520] Found more than one compression attribute
[exr @ 000000000dff9960] Found more than one compression attribute
[exr @ 000000000dff9dc0] Found more than one compression attribute
[exr @ 000000000dffa200] Found more than one compression attribute
[exr @ 000000000dffa660] Found more than one compression attribute
[exr @ 000000000dffaaa0] Found more than one compression attribute
[exr @ 000000000dffaf00] Found more than one compression attribute
[exr @ 000000000dffb340] Found more than one compression attribute
[exr @ 000000000dffb7a0] Found more than one compression attribute
[exr @ 000000000dffbbe0] Found more than one compression attribute
[exr @ 000000000dffc040] Found more than one compression attribute
[exr @ 000000000dff8c40] Found more than one compression attribute
[exr @ 000000000dff90c0] Found more than one compression attribute
frame= 211 fps= 35 q=23.0 size= 332kB time=00:00:05.48 bitrate= 496.4kbits/s
Found more than one compression attribute
[exr @ 000000000dff9960] Found more than one compression attribute
[exr @ 000000000dff9dc0] Found more than one compression attribute
[exr @ 000000000dffa200] Found more than one compression attribute
[exr @ 000000000dffa660] Found more than one compression attribute
[exr @ 000000000dffaaa0] Found more than one compression attribute
[exr @ 000000000dffaf00] Found more than one compression attribute
[exr @ 000000000dffb340] Found more than one compression attribute
[exr @ 000000000dffb7a0] Found more than one compression attribute
[exr @ 000000000dffbbe0] Found more than one compression attribute
[exr @ 000000000dffc040] Found more than one compression attribute
[exr @ 000000000dff8c40] Found more than one compression attribute
[exr @ 000000000dff90c0] Found more than one compression attribute
[exr @ 000000000dff9520] Found more than one compression attribute
[exr @ 000000000dff9960] Found more than one compression attribute
[exr @ 000000000dff9dc0] Found more than one compression attribute
[exr @ 000000000dffa200] Found more than one compression attribute
frame= 228 fps= 34 q=23.0 size= 421kB time=00:00:06.16 bitrate= 559.8kbits/s
frame= 240 fps= 32 q=-1.0 Lsize= 708kB time=00:00:09.52 bitrate= 609.3kbits/s
video:705kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.505636%
[libx264 @ 0000000004d11540] frame I:2 Avg QP:15.07 size: 18186
[libx264 @ 0000000004d11540] frame P:73 Avg QP:16.51 size: 3719
[libx264 @ 0000000004d11540] frame B:165 Avg QP:18.38 size: 2502
[libx264 @ 0000000004d11540] consecutive B-frames: 2.5% 3.3% 42.5% 51.7%
[libx264 @ 0000000004d11540] mb I I16..4: 46.2% 33.3% 20.4%
[libx264 @ 0000000004d11540] mb P I16..4: 6.8% 2.0% 0.6% P16..4: 29.4% 10.5% 4.6% 0.0% 0.0% skip:46.1%
[libx264 @ 0000000004d11540] mb B I16..4: 1.8% 0.7% 0.2% B16..8: 40.9% 6.5% 0.3% direct: 1.2% skip:48.5% L0:52.0% L1:47.5% BI: 0.5%
[libx264 @ 0000000004d11540] 8x8 transform intra:24.7% inter:81.3%
[libx264 @ 0000000004d11540] direct mvs spatial:93.3% temporal:6.7%
[libx264 @ 0000000004d11540] coded y,uvDC,uvAC intra: 10.7% 31.4% 24.9% inter: 2.3% 9.0% 2.9%
[libx264 @ 0000000004d11540] i16 v,h,dc,p: 83% 11% 6% 1%
[libx264 @ 0000000004d11540] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 9% 9% 52% 6% 4% 4% 5% 5% 5%
[libx264 @ 0000000004d11540] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 11% 44% 5% 4% 3% 3% 4% 3%
[libx264 @ 0000000004d11540] i8c dc,h,v,p: 69% 15% 15% 2%
[libx264 @ 0000000004d11540] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000000004d11540] ref P L0: 48.9% 0.1% 16.8% 17.0% 11.3% 5.8%
[libx264 @ 0000000004d11540] ref B L0: 57.7% 21.9% 13.9% 6.4%
[libx264 @ 0000000004d11540] ref B L1: 82.4% 17.6%
[libx264 @ 0000000004d11540] kb/s:600.61
誰かがどこから始めればよいか考えていますか?
こんにちは私はそれをすべて手に入れたかどうかわかりませんが、いくつかのさらなるテストを行いました。 exrを線形空間で変換し、exrをsrgb空間で変換しました。
線形iは、ffmpegで次のタグを使用してsrgbに変換しました。
-vf lutrgb=r=gammaval(0.45454545):g=gammaval(0.45454545):b=gammaval(0.45454545)
その結果、バンディングが発生しました。
すでにsrgbであり、-vf lutrgbタグがないものは見栄えがしました:
両方のソース画像のビット深度がまったく同じであるため、問題はビット削減だと思いますか?解決策につながる可能性のある他の何かを試す必要がありますか?
@rajib問題は、ビット削減後に色空間変換が行われることだと思いませんか。そしてもちろん、8ビット画像には色空間変換のための十分な情報が残っていませんか?
もしそうなら、どういうわけか、与えられた順序で異なる操作をスタックすることが可能です:1。入力ビット深度を変更しないか、8ビットより高くします2.ガンマルート変換を行います3.ビット深度を8ビットに減らします
おそらくここでは少し遅れますが、他の誰かが同じ問題を抱えている場合。
問題は、最初のexr画像がすでにロードされた後にガンマ補正が適用されることです。 exrにsRGB用のガンマ2.2をロードし、出力ビデオをガンマ補正しないでください。また、QuickTimeは奇妙なガンマシフトで有名なので、ビデオの再生に使用しないでください。
C:/ffmpeg.exe -y -gamma 2.2 -i C:/seq_v001.%04d.exr -vcodec libx264 -pix_fmt yuv420p -preset slow -crf 18 -r 25 C:/out.mov
ffmpeg
を使用してmovファイルを保存する場合は、32ビット画像を下位ビットに変換する必要があります。
それ以外の場合は、Nuke
を使用してmovにレンダリングすることをお勧めします。 Nukeは完全にmov形式にレンダリングでき、グレードノードにガンマ補正を適用すると線形空間からsRGBに変換されます。 10ビットまたは8ビットmov
に保存すると、ビットも自動的に「縮小」されます。