It seems sRGB is not handled since profile/preset and render options do not mention it.
Make a new render profile and try. ffmpeg -apply_trc iec61966_2_1 -start_frame 1100 -i input.$04d.exr output.mp4 more details see here: https://stackoverflow.com/questions/37489798/ffmpeg-getting-a-dark-output-when-converting-exr-sequence-to-mp4
Thank you for the information, but it applies to an “EXR linear input” and I do not have this kind of input. -------------------------------------------------------------------------------- Request sRGB to https://www.mltframework.org/ is probably better since Kdenlive uses MLT with its profile/preset and render options, but I will not do so because sRGB is finally not what I am seeking.