Exr file sequence to mov with ffmpeg

12,638

Solution 1

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: enter image description here

The one which already was srgb and did not have the -vf lutrgb tag looked nice: enter image description here

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

Solution 2

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.mov
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user1863947
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user1863947

Updated on September 18, 2022

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  • user1863947
    user1863947 almost 2 years

    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.mov
    

    Here 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 - 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    
    Found more than one compression attribute
    [exr @ 000000000dff9960] Found more than one compression attribute
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    frame=   34 fps= 33 q=0.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s    
    Found more than one compression attribute
    [exr @ 000000000dffaf00] Found more than one compression attribute
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    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    
    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    
    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
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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
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    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
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    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
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    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
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    [exr @ 000000000dffb7a0] Found more than one compression attribute
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    [exr @ 000000000dffc040] Found more than one compression attribute
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    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
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    [exr @ 000000000dff90c0] Found more than one compression attribute
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    [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
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    [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
    

    Does someone have an idea where to start?

    • Elisa Cha Cha
      Elisa Cha Cha about 10 years
      Please provide a sample input exr frame.
    • Rajib
      Rajib about 10 years
      Not sure whether x264 can handle 32bit floating point- I was under the impression that it can only handle up to 10 bits- but I may be wrong.
    • user1863947
      user1863947 about 10 years
      @slhck I have tried with a newer version aswell and runned into the same problems do you want me to upload the output?
    • user1863947
      user1863947 about 10 years
      @LordNeckbeard Here is a link to a similar exr file which has the same issue when converting to a quicktime: fileswap.com/dl/PRoqQIdpBg And here is the result when i put it through ffmpeg: fileswap.com/dl/2dFwqgnXnc
    • user1863947
      user1863947 about 10 years
      @Rajib I understand that with a lower bitrate banding can occure but its quite a lot. I have an example when i save a 8bit jpeg which has banding aswell but by far not that much: fileswap.com/dl/qFejkabFnd Here is the same file with more banding which went through ffmpeg: fileswap.com/dl/2dFwqgnXnc
    • Rajib
      Rajib about 10 years
      How did you save as jpeg- through which software? Programs that can open 32 bit will be able to smoothen and dither. This is not a bitrate issue. This is bits per channel (number of grades defining darkest shade to white for each channel).
    • user1863947
      user1863947 about 10 years
      @Rajib I saved it through Nuke a compositing software which can handle 32bit