I only recently discovered dual iso, and as you've all been saying for years, it's nothing short of amazing.
My trouble is that in every video I shoot, there's loads of flickering - the exposure seems to change noticeably from frame to frame, making the video seem to 'flicker' when played at normal speed. I've read the entire thread, and haven't been able to find a working solution, apart from faulty black and white levels, which should be fixed by exiftool. I tested this, reading a few of the (cr2hdr) processed DNGs using exiftool, and can confirm that the white and black levels remain constant across frames, including those exhibiting the apparent change in exposure, at 8192 and 65128, respectively.
I suppose this can be changed by constantly altering the exposure in post, but it will be very laborious to have to do it throughout the length of each video, so I'm hoping the latest cr2hdr has an improved algorithm to detect these variations.
All footage is shot on a 5D3, on the October 27 4k_lossless branch build. At first, I processed it with Switch, then to confirm with the mlv_dump + cr2hdr combination, as documented on the original post in this thread, using the --same-levels argument.
I'm on macOS Sierra (10.12.6), and have tried the cr2hdr in the OP, which is quite old, if I remember, as well as the one from Danne's Switch, which is:
Last update: ab1e90c on 2015-11-24 09:50:19 UTC by a1ex:
cr2hdr: moved safeguard from median_int_wirth to kth_smallest_i..
As far as I can tell, there have been a number of changes to cr2hdr.c in the repo, which I've tried building, but end up with build errors:
make cr2hdr
/bin/sh: /Volumes/Data HD/Users/sacha/gcc-arm-none-eabi-4_8-2013q4/bin/arm-none-eabi-gcc-4.8.3: No such file or directory
[ gcc ] cr2hdr
cr2hdr.c:59:1: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
MODULE_STRINGS()
^
cr2hdr.c:59:17: error: expected ';' after top level declarator
MODULE_STRINGS()
^
;
cr2hdr.c:573:51: error: use of undeclared identifier 'dual_iso_strings'
printf("Last update: %s\n", module_get_string(dual_iso_strings, "Last update"));
^
cr2hdr.c:1334:46: warning: if statement has empty body [-Wempty-body]
if(system("octave --persist rggb.m"));
^
cr2hdr.c:1334:46: note: put the semicolon on a separate line to silence this warning
cr2hdr.c:1472:46: warning: if statement has empty body [-Wempty-body]
if(system("octave --persist bddb.m"));
^
cr2hdr.c:1472:46: note: put the semicolon on a separate line to silence this warning
cr2hdr.c:1748:51: warning: if statement has empty body [-Wempty-body]
if(system("octave --persist iso-curve.m"));
^
cr2hdr.c:1748:51: note: put the semicolon on a separate line to silence this warning
cr2hdr.c:2184:55: warning: if statement has empty body [-Wempty-body]
if(system("octave --persist fullres-curve.m"));
^
cr2hdr.c:2184:55: note: put the semicolon on a separate line to silence this warning
cr2hdr.c:2518:56: warning: if statement has empty body [-Wempty-body]
if(system("dcraw -d -r 1 1 1 1 edges.dng"));
^
cr2hdr.c:2518:56: note: put the semicolon on a separate line to silence this warning
cr2hdr.c:2531:59: warning: if statement has empty body [-Wempty-body]
if(system("dcraw -d -r 1 1 1 1 edge-map.dng"));
^
cr2hdr.c:2531:59: note: put the semicolon on a separate line to silence this warning
cr2hdr.c:2557:21: error: function definition is not allowed here
{
^
cr2hdr.c:2571:31: warning: implicit declaration of function 'edge_interp' is invalid in C99 [-Wimplicit-function-declaration]
int pi0 = edge_interp(dir);
^
cr2hdr.c:2824:51: warning: if statement has empty body [-Wempty-body]
if(system("octave --persist mix-curve.m"));
^
cr2hdr.c:2824:51: note: put the semicolon on a separate line to silence this warning
cr2hdr.c:3308:55: warning: if statement has empty body [-Wempty-body]
if(system("octave --persist soft-film.m"));
^
cr2hdr.c:3308:55: note: put the semicolon on a separate line to silence this warning
cr2hdr.c:3652:34: warning: if statement has empty body [-Wempty-body]
if(system("octave wb.m"));
^
cr2hdr.c:3652:34: note: put the semicolon on a separate line to silence this warning
11 warnings and 3 errors generated.
dcraw-bridge.c:101:3: warning: unused variable 'unique' [-Wunused-const-variable]
} unique[] = {
^
1 warning generated.
amaze_demosaic_RT.c:983:10: warning: absolute value function 'fabsf' given an argument of type 'double' but has parameter of type 'float' which may cause truncation of value
[-Wabsolute-value]
if (fabsf(0.5-hvwt[indx>>1])<fabsf(0.5-hvwtalt)) {hvwt[indx>>1]=hvwtalt;}//a better result was obtained from the neighbors
^
amaze_demosaic_RT.c:983:10: note: use function 'fabs' instead
if (fabsf(0.5-hvwt[indx>>1])<fabsf(0.5-hvwtalt)) {hvwt[indx>>1]=hvwtalt;}//a better result was obtained from the neighbors
^~~~~
fabs
amaze_demosaic_RT.c:983:35: warning: absolute value function 'fabsf' given an argument of type 'double' but has parameter of type 'float' which may cause truncation of value
[-Wabsolute-value]
if (fabsf(0.5-hvwt[indx>>1])<fabsf(0.5-hvwtalt)) {hvwt[indx>>1]=hvwtalt;}//a better result was obtained from the neighbors
^
amaze_demosaic_RT.c:983:35: note: use function 'fabs' instead
if (fabsf(0.5-hvwt[indx>>1])<fabsf(0.5-hvwtalt)) {hvwt[indx>>1]=hvwtalt;}//a better result was obtained from the neighbors
^~~~~
fabs
amaze_demosaic_RT.c:1215:10: warning: absolute value function 'fabsf' given an argument of type 'double' but has parameter of type 'float' which may cause truncation of value
[-Wabsolute-value]
if (fabsf(0.5-pmwt[indx>>1])<fabsf(0.5-hvwt[indx>>1]) )
^
amaze_demosaic_RT.c:1215:10: note: use function 'fabs' instead
if (fabsf(0.5-pmwt[indx>>1])<fabsf(0.5-hvwt[indx>>1]) )
^~~~~
fabs
amaze_demosaic_RT.c:1215:35: warning: absolute value function 'fabsf' given an argument of type 'double' but has parameter of type 'float' which may cause truncation of value
[-Wabsolute-value]
if (fabsf(0.5-pmwt[indx>>1])<fabsf(0.5-hvwt[indx>>1]) )
^
amaze_demosaic_RT.c:1215:35: note: use function 'fabs' instead
if (fabsf(0.5-pmwt[indx>>1])<fabsf(0.5-hvwt[indx>>1]) )
^~~~~
fabs
4 warnings generated.
make: *** [cr2hdr] Error 1
Can anyone who's been able to build on the mac help with either the errors, or to share their build environment settings/dependencies? I have installed dcraw and exiftool, and Python's docutils (someone's build failed because of this dependency).
