Exr file sequence to mov with ffmpeg
Olivia Zamora 
When I convert an EXR file sequence with x264 using FFmpeg and convert the colorspace from linear to SRGB (with gamma 0.45454545) I get some heavy banding issues (most visible on a dark gradient). For me it looks like it converts the video first and afterwards applies the gamma correction on 8-bit clipped video. If so is it somehow possible to convert the imagesequence from linear to srg first and then convert it into Quicktime?
Here is the ffmpeg command I use:
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.movHere is the output:
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 - - 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
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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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frame= 52 fps= 34 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
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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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frame= 85 fps= 33 q=23.0 size= 47kB time=00:00:00.44 bitrate= 867.5kbits/s
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frame= 104 fps= 34 q=23.0 size= 94kB time=00:00:01.20 bitrate= 640.3kbits/s
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frame= 121 fps= 34 q=23.0 size= 133kB time=00:00:01.88 bitrate= 577.8kbits/s
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frame= 139 fps= 34 q=23.0 size= 172kB time=00:00:02.60 bitrate= 543.4kbits/s
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frame= 157 fps= 34 q=23.0 size= 213kB time=00:00:03.32 bitrate= 525.6kbits/s
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frame= 175 fps= 34 q=23.0 size= 254kB time=00:00:04.04 bitrate= 516.0kbits/s
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frame= 193 fps= 35 q=23.0 size= 287kB time=00:00:04.76 bitrate= 494.6kbits/s
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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
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[exr @ 000000000dff90c0] Found more than one compression attribute
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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:600.61Does someone have an idea where to start?
3 Answers
Hi dont know if i got it all but did some further testing. I converted a exr with linear space and a exr with srgb space.
The linear i converted with ffmpeg into srgb with the following tag:
-vf lutrgb=r=gammaval(0.45454545):g=gammaval(0.45454545):b=gammaval(0.45454545)and the result had the banding:
The one which already was srgb and did not have the -vf lutrgb tag looked nice:
Do you still think the problem is the bits reduction because both source images had exactly the same bit depth? Is there something else i should try which could lead to a solution?
@rajib Dont you think the problem is that the colorspace conversion happens after the bits reduction. And then of course the 8 bit image has not enough information left for the colorspace conversion?
If so is it somehow possible to stack different operations in a given order: 1. Dont change the input bit depth or have it higher than 8 bits 2. Do the gamma lut conversion 3. Reduce the bit depth to 8 bits
Probably a bit late here, but if anyone else has the same issue.
The problem is the gamma correction is applied after the initial exr image has already been loaded. Load the exr with the gamma 2.2 for sRGB and don't gamma correct the output video. Also, quicktime is notorious for wierd gamma shifts so don't use it to play back your videos.
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.movPossibly you should convert the 32 bit images to lower bits if you wish to use ffmpeg to save a mov file.
Else you are better off using Nuke to render to mov. Nuke is perfectly capable of rendering to mov format, and applying the gamma correction in a grade node will convert from linear space to sRGB. The bits will be also "scaled" down automatically when you save to a 10 bit or 8 bit mov.
