I'm rendering 2 files, and am baffled by the difference in resultant MP4 file sizes.
Both input files are identical apart from duration. One file is twice the length of the other - it's actually the same content copied and pasted to make the timeline twice as long
They are both rendered using exactly the same delivery settings. H.265, 3840x2160, 23.976fps, Quality restricted to 50000, VBR High Quality, Lookahead 16, AQ Strength 8.
File 1, 60 minutes in duration, produces a 4k MP4 file of 750Mb.
File 2, 120 minutes in duration comes out at 43Gb.
I'd really appreciate it if anyone could explain how a doubling of duration results in a file size 59x bigger? What am I doing wrong, please?
Black Magic has provided zero documentation for their constant quality encoder. The H.265 VBR 'Best' is garbage.
Export as DNxHR HQ and use a tool that actually had some intelligence going into its design, Handbrake.
Isn't handbrake more or less a gui for ffmpeg though? So it's basically adding some good defaults/presets to ffmpeg and some optimizations to its encoder?
And you can use ffmpeg within Resolve too as a plugin. I mean I fail to see how the design can be compared with 2 different kind of programs. Quality of the encoding software or exposed and changeable/chosen parameters maybe.